Article(id=1209927724681007875, tenantId=1146029695717560320, journalId=1149653034449285133, issueId=1209927720432169632, articleNumber=null, orderNo=null, doi=10.16790/j.cnki.1009-9239.im.2024.03.006, pmid=null, cstr=null, oa=null, hot=null, price=null, onlineType=0, articleFormat=0, articleType=null, articleTypeStr=research-article, receivedDate=1681401600000, receivedDateStr=2023-04-14, revisedDate=1685894400000, revisedDateStr=2023-06-05, acceptedDate=null, acceptedDateStr=null, onlineDate=1766398848934, onlineDateStr=2025-12-22, pubDate=1710864000000, pubDateStr=2024-03-20, doiRegisterDate=null, doiRegisterDateStr=null, onlineIssueDate=1766398848934, onlineIssueDateStr=2025-12-22, onlineJustAcceptDate=null, onlineJustAcceptDateStr=null, onlineFirstDate=null, onlineFirstDateStr=null, sourceXml=null, magXml=null, createTime=1766398848934, creator=13701087609, updateTime=1766398848934, updator=13701087609, issue=Issue{id=1209927720432169632, tenantId=1146029695717560320, journalId=1149653034449285133, year='2024', volume='57', issue='3', pageStart='1', pageEnd='128', issueExtLink='null', onlineDate='null', pubDate='null', beforeIssueId=null, nextIssueId=null, price=null, status=1, issueComplete=1, articleOrder=1, issueType=-1, specialIssue=null, createTime=1766398847920, creator=13701087609, updateTime=1766563849864, updator=13701087609, preIssue=null, nextIssue=null, ext={EN=IssueExt(id=1210619788792033962, tenantId=1146029695717560320, journalId=1149653034449285133, issueId=1209927720432169632, language=EN, specialIssueTitle=, coverIllustrator=null, specialIssueEditor=, specialIssueAbout=), CN=IssueExt(id=1210619788792033963, tenantId=1146029695717560320, journalId=1149653034449285133, issueId=1209927720432169632, language=CN, specialIssueTitle=, coverIllustrator=null, specialIssueEditor=, specialIssueAbout=)}, issueFiles=null}, startPage=42, endPage=49, ext={EN=ArticleExt(id=1209927724949443337, articleId=1209927724681007875, tenantId=1146029695717560320, journalId=1149653034449285133, language=EN, title=Effect of molding method on dielectric properties of XLPE/OMMT nanocomposites, columnId=1190369066675179686, journalTitle=Insulating Materials, columnName=Material Research, runingTitle=null, highlight=null, articleAbstract=

In order to study the effects of compression molding and extrusion molding on the dielectric properties of nanocomposites, these two molding methods were used to prepared the crosslinked polyethylene/organic montmorillonite (XLPE/OMMT) nanocomposites, respectively. The effects of the interlayer spacing change of OMMT in different composites on the resistance-temperature characteristics, dielectric constant, dielectric loss, and electric strength of the composites were discussed. The results show that the force field effect during the molding process can affect the intercalation dispersion effect of OMMT. The tensile stress during extrusion molding makes the OMMT sheets in the sample orient along the tensile direction, and form a regular arrangement unit, which hinders the migration of carriers, thereby improving the resistance-temperature characteristics of the sample. The movement of polymer molecular segments is lim-ited between the oriented lamella, which makes the dipole in the sample decrease, and the dielectric constant and dielectric loss factor decrease. At the same time, the effective intercalation of OMMT and the hybrid structure formed by the polymer cause diffuse reflection of electrons, extending the electron motion path, and improving the electric strength of the extruded sample.

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为了研究压制成型法和挤出成型法对纳米复合材料介电性能的影响,分别采用两种成型方式制备了交联聚乙烯/有机化蒙脱土(XLPE/OMMT)纳米复合材料。探讨了不同复合材料中有机化蒙脱土的层间距变化对复合材料电阻-温度特性、介电常数和介质损耗以及电气强度的影响。结果表明:成型加工过程中的力场作用会影响OMMT的插层分散效果;挤出成型过程中的拉伸应力使试样中OMMT片层沿拉伸方向进行取向,形成了规整排列单元,载流子的迁移运动受到阻碍,从而改善了试样的电阻-温度特性;聚合物分子链段的运动受限于取向的片层间,使试样中偶极子的极化率降低,使得介电常数和介质损耗因数减小;同时,OMMT的有效插层与聚合物形成的杂化结构使电子产生漫反射现象,延长了电子运动路径,提高了挤出成型试样的电气强度。

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常锦涛(1997-),男(汉族),山东德州人,硕士生,主要从事高电压与绝缘技术的研究;

李秀峰(1974-),女(汉族),山东青岛人,副教授,博士,主要从事电缆料及电缆附件关键问题与技术,纳米复合电介质特性及应用,电力设备绝缘结构优化设计的工作。

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常锦涛(1997-),男(汉族),山东德州人,硕士生,主要从事高电压与绝缘技术的研究;

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常锦涛(1997-),男(汉族),山东德州人,硕士生,主要从事高电压与绝缘技术的研究;

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李秀峰(1974-),女(汉族),山东青岛人,副教授,博士,主要从事电缆料及电缆附件关键问题与技术,纳米复合电介质特性及应用,电力设备绝缘结构优化设计的工作。

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李秀峰(1974-),女(汉族),山东青岛人,副教授,博士,主要从事电缆料及电缆附件关键问题与技术,纳米复合电介质特性及应用,电力设备绝缘结构优化设计的工作。

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成型方式试样质量分数/%编号
XLPEOMMT
压制成型XLPE100.0P-XLPE
XLPE/OMMT99.80.2P-XLPE/OMMT-0.2%
99.50.5P-XLPE/OMMT-0.5%
99.01.0P-XLPE/OMMT-1.0%
98.02.0P-XLPE/OMMT-2.0%
97.03.0P-XLPE/OMMT-3.0%
挤出成型XLPE100.0E-XLPE
XLPE/OMMT99.80.2E-XLPE/OMMT-0.2%
99.50.5E-XLPE/OMMT-0.5%
99.01.0E-XLPE/OMMT-1.0%
98.02.0E-XLPE/OMMT-2.0%
97.03.0E-XLPE/OMMT-3.0%
), ArticleFig(id=1217486326627226314, tenantId=1146029695717560320, journalId=1149653034449285133, articleId=1209927724681007875, language=CN, label=表1, caption=

各试样的组成成分及编号

, figureFileSmall=null, figureFileBig=null, tableContent=
成型方式试样质量分数/%编号
XLPEOMMT
压制成型XLPE100.0P-XLPE
XLPE/OMMT99.80.2P-XLPE/OMMT-0.2%
99.50.5P-XLPE/OMMT-0.5%
99.01.0P-XLPE/OMMT-1.0%
98.02.0P-XLPE/OMMT-2.0%
97.03.0P-XLPE/OMMT-3.0%
挤出成型XLPE100.0E-XLPE
XLPE/OMMT99.80.2E-XLPE/OMMT-0.2%
99.50.5E-XLPE/OMMT-0.5%
99.01.0E-XLPE/OMMT-1.0%
98.02.0E-XLPE/OMMT-2.0%
97.03.0E-XLPE/OMMT-3.0%
), ArticleFig(id=1217486326732083922, tenantId=1146029695717560320, journalId=1149653034449285133, articleId=1209927724681007875, language=EN, label=Tab.2, caption=Interlayer spacing data of different samples, figureFileSmall=null, figureFileBig=null, tableContent=
试样衍射角/(°)层间距/nm变化率/%
MMT6.201.42
OMMT3.452.5579.6
母料1.904.65227.5
P-XLPE/OMMT-2.0%1.854.77235.9
E-XLPE/OMMT-2.0%1.824.85241.5
), ArticleFig(id=1217486326836941523, tenantId=1146029695717560320, journalId=1149653034449285133, articleId=1209927724681007875, language=CN, label=表2, caption=

试样的层间距数据

, figureFileSmall=null, figureFileBig=null, tableContent=
试样衍射角/(°)层间距/nm变化率/%
MMT6.201.42
OMMT3.452.5579.6
母料1.904.65227.5
P-XLPE/OMMT-2.0%1.854.77235.9
E-XLPE/OMMT-2.0%1.824.85241.5
), ArticleFig(id=1217486326937604823, tenantId=1146029695717560320, journalId=1149653034449285133, articleId=1209927724681007875, language=EN, label=Tab.3, caption=Activation energy of XLPE and its nanocomposites, figureFileSmall=null, figureFileBig=null, tableContent=
成型方式试样活化能/eV
压制成型P-XLPE0.30
P-XLPE/OMMT-0.2%0.32
P-XLPE/OMMT-0.5%0.38
P-XLPE/OMMT-1.0%0.37
P-XLPE/OMMT-2.0%0.31
P-XLPE/OMMT-3.0%0.33
挤出成型E-XLPE0.39
E-XLPE/OMMT-0.2%0.41
E-XLPE/OMMT-0.5%0.48
E-XLPE/OMMT-1.0%0.45
E-XLPE/OMMT-2.0%0.43
E-XLPE/OMMT-3.0%0.33
), ArticleFig(id=1217486327021490909, tenantId=1146029695717560320, journalId=1149653034449285133, articleId=1209927724681007875, language=CN, label=表3, caption=

XLPE及其纳米复合材料的活化能

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成型方式试样活化能/eV
压制成型P-XLPE0.30
P-XLPE/OMMT-0.2%0.32
P-XLPE/OMMT-0.5%0.38
P-XLPE/OMMT-1.0%0.37
P-XLPE/OMMT-2.0%0.31
P-XLPE/OMMT-3.0%0.33
挤出成型E-XLPE0.39
E-XLPE/OMMT-0.2%0.41
E-XLPE/OMMT-0.5%0.48
E-XLPE/OMMT-1.0%0.45
E-XLPE/OMMT-2.0%0.43
E-XLPE/OMMT-3.0%0.33
), ArticleFig(id=1217486327126348513, tenantId=1146029695717560320, journalId=1149653034449285133, articleId=1209927724681007875, language=EN, label=Tab.4, caption=Breakdown characteristic parameters of XLPE and its nanocomposites, figureFileSmall=null, figureFileBig=null, tableContent=
试样OMMT质量分数/%尺寸参数/(kV/mm)形状参数
P-XLPE33.37.6
P-XLPE/OMMT-0.2%0.240.08.1
P-XLPE/OMMT-0.5%0.542.513.6
P-XLPE/OMMT-1.0%1.041.810.2
P-XLPE/OMMT-2.0%2.041.212.9
P-XLPE/OMMT-3.0%3.040.68.8
E-XLPE38.111.4
E-XLPE/OMMT-0.2%0.240.713.9
E-XLPE/OMMT-0.5%0.543.218.3
E-XLPE/OMMT-1.0%1.042.217.2
E-XLPE/OMMT-2.0%2.041.515.5
E-XLPE/OMMT-3.0%3.040.414.9
), ArticleFig(id=1217486327197651685, tenantId=1146029695717560320, journalId=1149653034449285133, articleId=1209927724681007875, language=CN, label=表4, caption=

XLPE及其纳米复合材料的击穿特征参数

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试样OMMT质量分数/%尺寸参数/(kV/mm)形状参数
P-XLPE33.37.6
P-XLPE/OMMT-0.2%0.240.08.1
P-XLPE/OMMT-0.5%0.542.513.6
P-XLPE/OMMT-1.0%1.041.810.2
P-XLPE/OMMT-2.0%2.041.212.9
P-XLPE/OMMT-3.0%3.040.68.8
E-XLPE38.111.4
E-XLPE/OMMT-0.2%0.240.713.9
E-XLPE/OMMT-0.5%0.543.218.3
E-XLPE/OMMT-1.0%1.042.217.2
E-XLPE/OMMT-2.0%2.041.515.5
E-XLPE/OMMT-3.0%3.040.414.9
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成型方式对XLPE/OMMT纳米复合材料介电性能的影响
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常锦涛 1 , 董瑞雪 1 , 李秀峰 1 , 韩圣斌 1 , 李昊泽 1 , 马涛 2
绝缘材料 | 材料研究 2024,57(3): 42-49
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绝缘材料 | 材料研究 2024, 57(3): 42-49
成型方式对XLPE/OMMT纳米复合材料介电性能的影响
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常锦涛1, 董瑞雪1, 李秀峰1, 韩圣斌1, 李昊泽1, 马涛2
作者信息
  • 1山东理工大学 电气与电子工程学院,山东 淄博 255000
  • 2国网淄博供电公司,山东 淄博 255000
  • 常锦涛(1997-),男(汉族),山东德州人,硕士生,主要从事高电压与绝缘技术的研究;

    李秀峰(1974-),女(汉族),山东青岛人,副教授,博士,主要从事电缆料及电缆附件关键问题与技术,纳米复合电介质特性及应用,电力设备绝缘结构优化设计的工作。

Effect of molding method on dielectric properties of XLPE/OMMT nanocomposites
Jintao CHANG1, Ruixue DONG1, Xiufeng LI1, Shengbin HAN1, Haoze LI1, Tao MA2
Affiliations
  • 1School of Electrical and Electronic Engineering, Shandong University of Technology, Zibo 255000, China
  • 2State Grid Zibo Power Supply Company, Zibo 255000, China
出版时间: 2024-03-20 doi: 10.16790/j.cnki.1009-9239.im.2024.03.006
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为了研究压制成型法和挤出成型法对纳米复合材料介电性能的影响,分别采用两种成型方式制备了交联聚乙烯/有机化蒙脱土(XLPE/OMMT)纳米复合材料。探讨了不同复合材料中有机化蒙脱土的层间距变化对复合材料电阻-温度特性、介电常数和介质损耗以及电气强度的影响。结果表明:成型加工过程中的力场作用会影响OMMT的插层分散效果;挤出成型过程中的拉伸应力使试样中OMMT片层沿拉伸方向进行取向,形成了规整排列单元,载流子的迁移运动受到阻碍,从而改善了试样的电阻-温度特性;聚合物分子链段的运动受限于取向的片层间,使试样中偶极子的极化率降低,使得介电常数和介质损耗因数减小;同时,OMMT的有效插层与聚合物形成的杂化结构使电子产生漫反射现象,延长了电子运动路径,提高了挤出成型试样的电气强度。

交联聚乙烯  /  蒙脱土  /  成型方式  /  微观结构  /  介电性能

In order to study the effects of compression molding and extrusion molding on the dielectric properties of nanocomposites, these two molding methods were used to prepared the crosslinked polyethylene/organic montmorillonite (XLPE/OMMT) nanocomposites, respectively. The effects of the interlayer spacing change of OMMT in different composites on the resistance-temperature characteristics, dielectric constant, dielectric loss, and electric strength of the composites were discussed. The results show that the force field effect during the molding process can affect the intercalation dispersion effect of OMMT. The tensile stress during extrusion molding makes the OMMT sheets in the sample orient along the tensile direction, and form a regular arrangement unit, which hinders the migration of carriers, thereby improving the resistance-temperature characteristics of the sample. The movement of polymer molecular segments is lim-ited between the oriented lamella, which makes the dipole in the sample decrease, and the dielectric constant and dielectric loss factor decrease. At the same time, the effective intercalation of OMMT and the hybrid structure formed by the polymer cause diffuse reflection of electrons, extending the electron motion path, and improving the electric strength of the extruded sample.

crosslinked polyethylene  /  montmorillonite  /  molding method  /  microstructure  /  dielectric properties
常锦涛, 董瑞雪, 李秀峰, 韩圣斌, 李昊泽, 马涛. 成型方式对XLPE/OMMT纳米复合材料介电性能的影响. 绝缘材料, 2024 , 57 (3) : 42 -49 . DOI: 10.16790/j.cnki.1009-9239.im.2024.03.006
Jintao CHANG, Ruixue DONG, Xiufeng LI, Shengbin HAN, Haoze LI, Tao MA. Effect of molding method on dielectric properties of XLPE/OMMT nanocomposites[J]. Insulating Materials, 2024 , 57 (3) : 42 -49 . DOI: 10.16790/j.cnki.1009-9239.im.2024.03.006
聚合物基纳米复合材料是将填料以纳米尺度均匀分散于聚合物中形成的复合体系[1],纳米掺杂改性聚合物可以使复合材料在电学性能、热学性能和力学性能等方面优于传统聚合物。影响复合材料性能的因素多种多样,其中纳米填料与聚合物基体之间的界面作用[2]、纳米颗粒的分布情况[3]以及纳米颗粒的存在形式[4]起到主要影响作用。王思蛟等[5]制备了聚乙烯/氧化铝纳米复合材料,并对其介电性能进行研究,发现掺杂纳米氧化铝后,复合材料界面区域的陷阱数量增加,捕获电荷的能力提高,使聚乙烯中空间电荷的积聚和电场的畸变现象得到显著改善。B ZAZOUM等[6]研究发现经表面处理剂修饰的二氧化钛在低密度聚乙烯中实现了良好分散,界面极化现象得到显著改善,材料介质损耗降低,电气强度明显提高。黄兴溢等[7]制备了低密度聚乙烯/氮化硼纳米复合材料,探究了纳米氮化硼形状与复合材料介电性能之间的关联规律,发现球状氮化硼在聚合物中的分散状态最佳,同时与基体之间的界面作用力较强,对空间电荷注入的抑制效果较为显著;而片状氮化硼对载流子起到散射阻碍作用,使复合材料的电气强度明显提高。纳米复合材料的性能在一定程度上还依赖于成型加工过程中填料在基体中所形成的取向结构[8]。S MORTAZAVIAN等[9]研究了纤维取向对短玻璃纤维增强热塑性塑料拉伸性能的影响,发现拉伸强度和弹性模量沿纤维取向方向到垂直于纤维取向方向显著降低。ZHONG B等[10]通过双辊铣削制备了具有定向纳米氮化硼的硅橡胶/氮化硼纳米复合材料,研究发现与随机分散纳米氮化硼的复合材料相比,具有定向结构的纳米复合材料热导率提高了22%。A P S ZANATTA等[11]通过磁场对纳米蒙脱土进行诱导,定向制备了低密度聚乙烯复合材料,结果发现诱导过程能够使纳米颗粒在聚合物中沿磁场方向发生有效排列,充分发挥了屏障效应,改善了复合材料的热稳定性。
纳米复合电介质宏观性能与其多层次结构密切相关[12]。蒙脱土(MMT)具有独特片层状结构,其在聚合物基体中的分散状态和取向状态会影响纳米复合材料微观结构的不确定性及介电性能[1]。电缆绝缘线芯的工厂生产采用连续的三层共挤方法,而绝缘材料的实验室研究一般采用平板硫化机的压制成型方式,两种成型方式的等效性或差异性值得探讨。众所周知,挤出和压制成型所施加的外部剪切力将影响MMT的有效插层和片层取向排列,聚乙烯交联过程产生的分子间作用力将二次影响MMT的层间距[13],热老化过程中聚合物聚集态结构的完善将再次影响MMT的片层间距及取向排列[14],因此有必要深入系统研究电气绝缘材料的制备工艺因素通过影响MMT的分散状态和微观形态稳定性,进而对其介电性能的影响机理。
为了对比两种成型方式制备试样的性能差异,采用压制成型法和挤出成型法分别制备XLPE/OMMT纳米复合材料。采用小角X射线衍射对不同复合材料中有机化蒙脱土的层间距进行测量;并通过测试试样的电气参数,探讨成型方式对XLPE/OMMT纳米复合材料介电性能的影响。
纳米蒙脱土,采用十八烷基苄基季铵盐进行预插层处理得到有机化蒙脱土,浙江丰虹新材料股份有限公司生产;35 kV可交联聚乙烯(crosslinked polyethylene,XLPE)粒料,采用型号为2220H的聚乙烯粒料(polyethylene,PE)与过氧化二异丙苯(DCP)和抗氧剂熔融混合造粒而成,南京中超新材料股份有限公司生产;马来酸酐接接枝料(PE-g-MAH),自制。
母料制备:按一定比例将聚乙烯(polyethylene,PE)、马来酸酐接枝料(PE-g-MAH)与有机化蒙脱土在双辊筒开炼机上熔融共混,制得OMMT质量分数为20%的母料。
压制成型试样:分别把质量分数为1%、2.5%、5%、10%、15%的母料加入到XLPE粒料中熔融共混,在100℃下混炼15 min。出料后,在平板硫化机上不加压预热,然后以温度为175℃、压力为15 MPa的条件对XLPE/OMMT压制15 min,冷却至室温,制得OMMT质量分数分别为0.2%、0.5%、1.0%、2.0%、3.0%,厚度为1 mm的XLPE/OMMT压制成型试样若干。
挤出成型试样:在工业生产中,电缆绝缘线芯是三层共挤后进入硫化管道中加压交联。由于实验环境受限,为了模拟实际生产过程中绝缘料挤出后的加压交联过程,将母料按1%、2.5%、5%、10%、15%的质量分数与XLPE粒料混合,利用转矩流变仪挤出条状试样,然后将制备得到的条状试样顺应挤出方向层叠放置,再加压进行交联,制得OMMT质量分数分别为0.2%、0.5%、1.0%、2.0%、3.0%,厚度为1 mm的XLPE/OMMT挤出成型试样若干。
各试样的组成成分及编号如表1所示,制备流程图如图1所示。
小角X射线衍射:采用德国BRUKER公司制造的D8 ADVANCE型射线衍射仪测量不同插层情况下OMMT的片层间距变化,步长为0.02步,扫描速度为0.1 s/步,扫描角度为1.5°~10°。根据式(1)所示Bragg方程[10]计算OMMT的层间距。
=2dsinθ
式(1)中:d为晶面间距(层间距);θ为入射角;λ为入射波波长;n为衍射等级。
电阻-温度特性:根据三电极系统原理,采用ZC36型高阻计分别在25、40、60、80、90℃下对试样的电阻-温度特性进行测试,试样厚度为1 mm,实验电压为1 kV。
西林电桥测试:采用QS87型高精密高压西林电桥测试各试样的介电常数和介质损耗因数,试样厚度为1 mm。
工频耐压测试:采用TYJK-50型击穿电压测试仪对试样进行电气强度(Eb)测试,升压速率为 2 kV/s。试样采用直径为120 mm、厚度为1 mm的圆形试片。每种试样制备3个试片,每个试片测试5个点的厚度,取其厚度平均值。每个试片测试5个击穿点,按照Eb=U/dU为击穿电压,d为厚度)计算电气强度,共计15个有效电气强度值进行Weibull分布分析。
为了表征不同插层情况下OMMT的片层间距变化规律,采用小角X射线衍射对OMMT的层间距进行测量。图2为MMT、OMMT、母料以及不同成型方式制备的纳米复合材料的小角X射线衍射(XRD)图谱,根据图示衍射峰峰位,由Bragg方程[15]计算得到OMMT在复合材料中的层间距数据,如表2所示。
图2表2可知,MMT的衍射角为6.20°,层间距为1.42 nm[16]。预插层处理后,OMMT的峰位向左偏移,层间距扩大至2.55 nm,增大了79.6%,表明OMMT实现了良好预插层。与OMMT粉末相比,母料中OMMT的衍射角由3.45°移至1.90°,层间距从2.55 nm扩大至4.65 nm。可见在相容剂PE-g-MAH的协助下,分子链段上的马来酸酐基团与OMMT中的胺基正离子实现了极性匹配,进入片层间扩大了OMMT的片层间距。两种成型方式制备的试样中OMMT层间距又进一步扩大,其中压制成型试样中OMMT的层间距扩大至4.77 nm,挤出成型试样中OMMT的层间距扩大至4.85 nm,表明OMMT在复合材料中均实现了剥离分散状态[17]。分析认为,成型过程中的应力作用使OMMT片层产生相对滑移,减弱了片层间的凝聚力,而PE-g-MAH相容剂与OMMT中有机插层剂的烷基链作用产生焓变,补偿了插层过程中熵的损失,使聚合物容易插层[18]。由于压制成型中应力作用的焓补偿和剪切作用较弱,使得压制成型试样中OMMT的层间距小于挤出成型试样。
为了进一步分析OMMT在聚合物基体中的分散状态,对试样的断面形貌进行了观察,显微镜放大倍数为10 000倍,结果如图3所示。
图3中浅白色颗粒为交联聚乙烯基体中的纳米OMMT,从图中可以看出,在XLPE基体中,OMMT分布较均匀,无明显的纳米团聚颗粒,且挤出成型试样中的OMMT较压制成型的OMMT呈现明显的取向分布结构。
载流子的浓度及其迁移运动是造成纳米复合材料体积电阻率(ρv)出现差异的主要原因。聚合物中载流子浓度与体积电阻率呈现负相关的变化规律,而束缚势垒(μ0)的大小决定了纳米复合材料中载流子迁移运动的强弱。束缚势垒(即活化能)由lnρv-(1/T )的直线斜率来表征[19],势垒越大,载流子迁移率越低。各试样的体积电阻率随温度变化的拟合曲线如图4所示,得到不同试样的活化能数据如表3所示。
图4可以看出,对于纯XLPE而言,挤出成型试样的体积电阻率高于压制成型试样。在测试温度范围内,压制成型试样和挤出成型试样的体积电阻率均随温度的升高而相应递减。分子链在成型加工过程中受到拉伸应力作用而发生取向,排列趋于平行规整,使聚合物中的自由体积减少[20],载流子的运动能力受到限制,迁移率降低,体积电阻率增大。随着温度升高,试样内部的热运动能力增强,载流子在热激发作用下活性增强[21],迁移率增大,从而使纳米复合材料的体积电阻率减小。
对于XLPE/OMMT纳米复合材料而言,试样的体积电阻率随填料含量的增加都呈现出先升高后降低的变化趋势。在填料含量较低时,体积电阻率较大;当填料含量超过某一界限时,体积电阻率减小。随着温度逐渐升高,体积电阻率呈现减小的变化趋势。体积电阻率增大的原因主要有两方面:一方面,OMMT加入到XLPE基体中,由于其具有大的比表面积,使得填料与基体之间形成了较多的界面区域,同时二者之间形成了较强的界面作用力[22],限制了载流子的迁移;另一方面,纳米OMMT在相容剂的作用下与基体之间形成较深的陷阱能级[23],使入陷载流子无法脱陷,从而导致体积电阻率增大。当OMMT含量较高时,部分OMMT充当复合材料中的杂质离子[24],增大了载流子浓度,且纳米OMMT与聚合物基体之间的界面作用力降低,从而对载流子迁移运动的限制作用减弱[13],导致体积电阻率减小。而温度升高后,被束缚的载流子受热激发跨越势垒参与迁移,电导率增加,同时OMMT与XLPE的界面结合力减弱,分子间作用力下降,对载流子运动的束缚力减小,导致体积电阻率随温度升高而减小。在相同OMMT添加量下,与压制成型试样相比,挤出成型制备的XLPE/OMMT纳米复合材料体积电阻率明显增大。由图5的载流子迁移示意图可知,挤出成型试样中OMMT片层的规整叠列赋予了聚合物“架层”结构,有利于阻碍载流子的定向运动[22],表明复合材料内部纳米片层的分散情况所决定的取向状态是影响材料绝缘性能的重要因素。
图4表3可以看出,不同成型工艺制备的纳米复合材料活化能随温度的变化趋势与体积电阻率的变化趋势相似。温度升高,聚合物内部晶区之间及晶区与非晶区的晶界势垒减小,离子热运动下通过晶界附近的隧道效应实现跃迁所需的能量减小[25],活化能降低。随着OMMT含量的增加,两种成型方式制备的试样活化能都呈现出先升高后下降的趋势,在质量分数为0.5%时活化能达到最大值。少量掺杂OMMT时,剥离分散的OMMT片层与交联聚乙烯基体的界面交互区增多,同时区域内深陷阱密度增加[26],更容易吸附载流子,而入陷载流子需要更多能量脱陷,导致势垒能级增加,活化能升高[27]。随着掺杂量的进一步增加,OMMT分散性变差,对载流子的阻碍能力减弱,同时过多的填料可能导致相邻陷阱势垒的相互交叠[28],降低了陷阱深度,因此需要克服的势垒能级降低,活化能降低。在OMMT含量相同时,挤出成型试样较压制成型试样的活化能高。这是因为高剪切的挤出作用力减少了纳米粒子发生团聚的可能[29],均匀分散的OMMT颗粒在基体内部形成更多的陷阱、更强的界面作用力,对载流子的捕获和束缚能力增强,参与导电的载流子数量减少,使得材料的势垒升高,活化能升高。
对各试样进行介电常数与介质损耗因数测试,结果如图6所示。
图6可以看出,对于纯XLPE而言,压制成型试样的介电常数和介质损耗因数与挤出成型试样的相差不大。而两种成型方式制备的XLPE/OMMT纳米复合材料介电常数与介质损耗因数随OMMT含量的增加,总体上呈现逐渐增大的趋势。经有机插层剂改性的蒙脱土为聚合物基体引入了极性分子基团,聚合物基体内极性基团数目增多,增大了偶极子的转向极化率,从而使复合材料的介电常数和介质损耗因数增大。随OMMT含量的增加,纳米填料在基体中的分散程度逐渐变差,出现团聚现象,引起界面效应下降[30],无法有效限制偶极子的转向极化,导致介电常数增大;同时由于MMT经过表面修饰之后引入了大量的极性基团,使交联聚乙烯基体在承受交变电场时除了产生电导损耗之外,还产生了大量松弛损耗,导致介质损耗因数增大。
与压制成型制备的XLPE/OMMT纳米复合材料相比,在相同OMMT含量下,挤出成型制备的XLPE/OMMT复合材料介电常数和介质损耗因数均明显减小。一方面,挤出成型过程中施加的拉伸应力使OMMT和聚合物分子链定向排列,聚合物基体分子链被限制在OMMT片层之间,造成偶极子极化困难,发生取向极化的概率减小;另一方面,挤出作用使部分XLPE分子链由缠结态向伸展态转化,规整排列的分子链段数量增多,有助于晶体的形成[31],材料结晶程度明显提高,而结晶完善的聚合物中偶极子受到更强的束缚作用[32],运动能力较弱,松弛程度降低,使得介电常数与介质损耗因数减小。而在压制成型试样中,纳米填料在基体中杂乱分散,可能出现局部团聚,团聚体与基体之间的界面作用力减弱[14],极化能力提高,介质损耗增大,因此压制成型试样的介电常数和介质损耗因数大于挤出成型试样。
采用Weibull分布函数分析了不同成型方式制备试样的工频击穿特性,结果如图7所示,Weibull分布参数列于表4中。
图7表4可以看出,随着OMMT含量的增加,XLPE/OMMT纳米复合材料的电气强度先升高后下降,数据分散性减小。在OMMT质量分数为0.5%时,压制成型试样和挤出成型试样的电气强度都达到最大值,且数据分散性最小。一方面,少量掺杂OMMT有利于形成剥离型结构的复合材料,使得纳米粒子的小尺寸、大比表面积的特性得到更好地发挥,从而形成良好的界面结构,提高了电子发生跃迁的势垒,对自由电子的迁移起到抑制效果[34];另一方面,OMMT片层在基体中剥离均匀分散,其本身具有的优良阻隔特性使电子在复合材料内传输时通过碰撞而减速,从而提高了复合材料的电气强度[35]。而过多添加纳米填料会导致OMMT在基体树脂中分散不均,出现局部团聚[33],与基体间形成微观缺陷;同时OMMT片层之间的距离随着OMMT含量增加而减小,相邻OMMT占据的空间可能会部分重合,出现界面的交叠现象[36],有可能形成较长且连续的周期性势场,提高了电子在界面内的迁移率,使得电子在迁移中从外施电场获得较高能量的概率增大[37],最终导致材料的击穿性能下降。从表4可知,对纯XLPE而言,挤出成型试样的尺寸参数和形状参数明显高于压制成型试样,可见挤出成型提高了试样的电气强度,且数据分散程度减小。在挤出成型过程中的拉伸取向使XLPE分子链排列更加规整,有助于减小非晶区域面积,使材料结晶度升高[33],内部结构变得致密,从而使试样具有较高的电气强度。
与压制成型试样相比,在相同OMMT含量下,挤出成型试样的尺寸参数和形状参数明显提高,其中E-XLPE/OMMT-0.5%试样仍保持较好的电气强度和数据分散性。这是由于挤出成型试样中存在多层次的取向结构单元,这种OMMT的有效插层与聚合物形成的杂化结构在聚合物基体中会发生电子漫反射现象[38],增加了电子运动路径,并且减少了高能电子对聚合物基体的轰击,因此提高了复合材料的电气强度。由此可知纳米OMMT在聚合物中的取向状态会影响复合材料的电气强度。
(1)纳米颗粒在基体树脂中的熔融分散状态取决于成型加工过程中的应力作用和相容剂的协同效果。应力作用使OMMT片层间的凝聚力减弱,而PE-g-MAH的协助作用使基体分子链能更容易地插入OMMT片层间形成剥离型纳米复合结构体系。
(2)挤出成型试样中OMMT片层沿取向方向规整排列,有效阻碍了载流子的定向运动,使复合材料的体积电阻率增大。
(3)聚合物分子链的运动受到取向OMMT片层限制,同时高剪切的挤出作用降低了局部团聚出现的可能,两相界面作用力增强,降低了偶极子的极化率,从而使挤出成型试样具有较小的介电常数和介质损耗因数。
(4)挤出成型试样内部形成多层次取向单元结构,OMMT片层的叠列结构减缓了自由电子对聚合物基体的冲击,从而显著提高了纳米复合材料的电气强度。
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doi: 10.16790/j.cnki.1009-9239.im.2024.03.006
  • 接收时间:2023-04-14
  • 首发时间:2025-12-22
  • 出版时间:2024-03-20
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  • 收稿日期:2023-04-14
  • 修回日期:2023-06-05
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    1山东理工大学 电气与电子工程学院,山东 淄博 255000
    2国网淄博供电公司,山东 淄博 255000
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2种不同金属材料的力学参数

Family
属数
Number of
genus
种数
Number of
species
占总种数比例
Percentage of
total species (%)

Genus
种数
Number of
species
占总种数比例
Percentage of total
species (%)
鹅膏菌科Amanitaceae 2 11 5.26 鹅膏菌属 Amanita 10 4.78
小菇科 Mycenaceae 2 12 5.74 丝盖伞属 Inocybe 5 2.39
多孔菌科 Polyporaceae 8 14 6.70 蜡蘑属 Laccaria 5 2.39
红菇科 Russulaceae 3 23 11.00 小皮伞属 Marasmius 6 2.87
小菇属 Mycena 11 5.26
光柄菇属 Pluteus 5 2.39
红菇属 Russula 17 8.13
栓菌属 Trametes 5 2.39
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