Article(id=1222495714169578134, tenantId=1146029695717560320, journalId=1149653034449285133, issueId=1222495713427186326, articleNumber=null, orderNo=null, doi=10.16790/j.cnki.1009-9239.im.2021.04.001, pmid=null, cstr=null, oa=null, hot=null, price=null, onlineType=0, articleFormat=0, articleType=null, articleTypeStr=research-article, receivedDate=1589644800000, receivedDateStr=2020-05-17, revisedDate=1592582400000, revisedDateStr=2020-06-20, acceptedDate=null, acceptedDateStr=null, onlineDate=1769395291129, onlineDateStr=2026-01-26, pubDate=1618848000000, pubDateStr=2021-04-20, doiRegisterDate=null, doiRegisterDateStr=null, onlineIssueDate=1769395291129, onlineIssueDateStr=2026-01-26, onlineJustAcceptDate=null, onlineJustAcceptDateStr=null, onlineFirstDate=null, onlineFirstDateStr=null, sourceXml=null, magXml=null, createTime=1769395291129, creator=13041195026, updateTime=1769395291129, updator=13041195026, issue=Issue{id=1222495713427186326, tenantId=1146029695717560320, journalId=1149653034449285133, year='2021', volume='54', issue='4', pageStart='1', pageEnd='108', issueExtLink='null', onlineDate='null', pubDate='null', beforeIssueId=null, nextIssueId=null, price=null, status=1, issueComplete=1, articleOrder=1, issueType=-1, specialIssue=null, createTime=1769395290953, creator=13041195026, updateTime=1770971792201, updator=13701087609, preIssue=null, nextIssue=null, ext={EN=IssueExt(id=1229108038972534891, tenantId=1146029695717560320, journalId=1149653034449285133, issueId=1222495713427186326, language=EN, specialIssueTitle=, coverIllustrator=null, specialIssueEditor=, specialIssueAbout=), CN=IssueExt(id=1229108038972534892, tenantId=1146029695717560320, journalId=1149653034449285133, issueId=1222495713427186326, language=CN, specialIssueTitle=, coverIllustrator=null, specialIssueEditor=, specialIssueAbout=)}, issueFiles=null}, startPage=1, endPage=7, ext={EN=ArticleExt(id=1222495714458985112, articleId=1222495714169578134, tenantId=1146029695717560320, journalId=1149653034449285133, language=EN, title=Research and Application Progress of Thermoplastic Polyimide, columnId=1198667062026531195, journalTitle=Insulating Materials, columnName=Review, runingTitle=null, highlight=null, articleAbstract=

Polyimide (PI) has been widely used as a kind of special engineering plastic. However, the further industrialization development of PI is limited due to its poor melting property. Thermoplastic polyimide (TPI) is developed by modifying the thermosetting PI, and its melting property and processability are improved qualitatively compared to thermosetting PI, so that it can be applied to flexible copper clad laminate, 3D printing and other fields. In this paper, the synthetic method, thermal, mechanical, and processing properties of TPI were summarized, and the application of TPI in flexible printed circuit and other important industrial fields were concluded. The future research directions of TPI were proposed.

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聚酰亚胺(PI)作为一种特种工程塑料而被广泛应用,但由于PI的熔融性能较差,产业化发展受到了限制。通过对热固性PI进行改性开发出的热塑性聚酰亚胺(TPI),其熔融性能和加工性能相对热固性PI有了质的提升,能够应用于柔性覆铜板、3D打印等领域。本文概述了TPI的合成方法及热学、力学、加工性能,总结了TPI在柔性线路板及其他重要工业领域的应用,提出了TPI未来的研究方向。

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刘屹东(1974-),男(汉族),吉林人,教授,主要从事高性能材料与器件的研究。
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刘存生(1998-),男(汉族),山东临沂人,硕士生,主要从事高性能高分子材料方面的研究。

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刘存生(1998-),男(汉族),山东临沂人,硕士生,主要从事高性能高分子材料方面的研究。

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种类原料优点缺点典型品牌及生产厂商
双酚A型TPI双酚A型二酐(BPADA)与芳二胺加工性能优异,价格较低Tg很低,耐热性较差Ultem®(GE)
均酐型TPI均苯四甲酸二酐(PMDA)与芳二胺耐热性能优异芳二胺单体成本较高Aurum®(日本三井东亚公司)
联苯酐型TPI

3,3′,4,4′-联苯四酸二酐

s-BPDA)与芳二胺

结晶能力较强,Tg较高结晶速度缓慢UPIMOL(日本宇部公司)
醚酐型TPI

二苯醚四酸二酐(ODPA)或三苯二醚四甲酸二酐与

芳二胺

反应活性高,溶解性好,

加工性能好,成本低,

原料来源广

Tg和结晶能力相对较低LaRCTM-IA(NASA);YS20(上海合成树脂所);YHPI(中国科学院长春应用化学研究所)
酮酐型TPI

二苯甲酮四酸二酐

(BTDA)与二胺

熔融加工性好,粘结性能

优良

单体价格较高,成本昂贵LaRCTM-TPI(NASA)
氟酐型TPI六氟二酐(6FDA)与芳二胺耐热性和氧化稳定性好含氟二酐的制备成本昂贵NR-150系列材料(美国杜邦公司)
), ArticleFig(id=1243119741930418815, tenantId=1146029695717560320, journalId=1149653034449285133, articleId=1222495714169578134, language=CN, label=表1, caption=

TPI种类

, figureFileSmall=null, figureFileBig=null, tableContent=
种类原料优点缺点典型品牌及生产厂商
双酚A型TPI双酚A型二酐(BPADA)与芳二胺加工性能优异,价格较低Tg很低,耐热性较差Ultem®(GE)
均酐型TPI均苯四甲酸二酐(PMDA)与芳二胺耐热性能优异芳二胺单体成本较高Aurum®(日本三井东亚公司)
联苯酐型TPI

3,3′,4,4′-联苯四酸二酐

s-BPDA)与芳二胺

结晶能力较强,Tg较高结晶速度缓慢UPIMOL(日本宇部公司)
醚酐型TPI

二苯醚四酸二酐(ODPA)或三苯二醚四甲酸二酐与

芳二胺

反应活性高,溶解性好,

加工性能好,成本低,

原料来源广

Tg和结晶能力相对较低LaRCTM-IA(NASA);YS20(上海合成树脂所);YHPI(中国科学院长春应用化学研究所)
酮酐型TPI

二苯甲酮四酸二酐

(BTDA)与二胺

熔融加工性好,粘结性能

优良

单体价格较高,成本昂贵LaRCTM-TPI(NASA)
氟酐型TPI六氟二酐(6FDA)与芳二胺耐热性和氧化稳定性好含氟二酐的制备成本昂贵NR-150系列材料(美国杜邦公司)
), ArticleFig(id=1243119742043665034, tenantId=1146029695717560320, journalId=1149653034449285133, articleId=1222495714169578134, language=EN, label=Tab.2, caption=Industrial application of TPI, figureFileSmall=null, figureFileBig=null, tableContent=
应用领域用途
机械工业TPI具有优异的力学性能与耐摩擦性,可替代钛合金用于制造各种零件[46],例如发动机内盖、致密零件、离合器齿圈等。
航空航天TPI具有良好的阻燃性能,用来生产飞机的零部件,可以减少飞机因火灾而导致的损害[47]
电子通信TPI在高温、高压和高湿度等恶劣的工作环境下可以保持良好的电气绝缘性,通常用于制造晶圆载体[48]、电子绝缘膜片和各种连接的设备。
医疗由TPI树脂制成的人造骨具有质轻、无毒、抗腐蚀性强的优点[49]
电力TPI具有良好的热稳定性与介电性,可以用来生产电线电缆等各种电力装备[50]
涂料在金属表面覆盖TPI的细粉涂料可获得具有优异绝缘性、较强耐腐蚀性、耐热性和耐水性的TPI粉末金属涂料产品,广泛用于化学防腐、家用电器、电子产品、机械等领域[47,51-52]
), ArticleFig(id=1243119742156911247, tenantId=1146029695717560320, journalId=1149653034449285133, articleId=1222495714169578134, language=CN, label=表2, caption=

TPI的产业应用

, figureFileSmall=null, figureFileBig=null, tableContent=
应用领域用途
机械工业TPI具有优异的力学性能与耐摩擦性,可替代钛合金用于制造各种零件[46],例如发动机内盖、致密零件、离合器齿圈等。
航空航天TPI具有良好的阻燃性能,用来生产飞机的零部件,可以减少飞机因火灾而导致的损害[47]
电子通信TPI在高温、高压和高湿度等恶劣的工作环境下可以保持良好的电气绝缘性,通常用于制造晶圆载体[48]、电子绝缘膜片和各种连接的设备。
医疗由TPI树脂制成的人造骨具有质轻、无毒、抗腐蚀性强的优点[49]
电力TPI具有良好的热稳定性与介电性,可以用来生产电线电缆等各种电力装备[50]
涂料在金属表面覆盖TPI的细粉涂料可获得具有优异绝缘性、较强耐腐蚀性、耐热性和耐水性的TPI粉末金属涂料产品,广泛用于化学防腐、家用电器、电子产品、机械等领域[47,51-52]
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热塑性聚酰亚胺的研究及应用进展
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刘存生 1 , 陈钰玮 1 , 曹景茹 1 , 刘佳 1 , 马小华 1 , 刘屹东 1, 2 , 闵永刚 1, 2
绝缘材料 | 综述 2021,54(4): 1-7
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绝缘材料 | 综述 2021, 54(4): 1-7
热塑性聚酰亚胺的研究及应用进展
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刘存生1, 陈钰玮1, 曹景茹1, 刘佳1, 马小华1, 刘屹东1, 2, 闵永刚1, 2
作者信息
  • 1广东工业大学 材料与能源学院,广东 广州 510006
  • 2东莞华南设计创新院,广东 东莞 523808
  • 刘存生(1998-),男(汉族),山东临沂人,硕士生,主要从事高性能高分子材料方面的研究。

通讯作者:

刘屹东(1974-),男(汉族),吉林人,教授,主要从事高性能材料与器件的研究。
Research and Application Progress of Thermoplastic Polyimide
Cunsheng LIU1, Yuwei CHEN1, Jingru CAO1, Jia LIU1, Xiaohua MA1, Yidong LIU1, 2, Yonggang MIN1, 2
Affiliations
  • 1School of Materials and Energy, Guangdong University of Technology, Guangzhou 510006, China
  • 2Dongguan South China Design Innovation Institute, Dongguan 523808, China
出版时间: 2021-04-20 doi: 10.16790/j.cnki.1009-9239.im.2021.04.001
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聚酰亚胺(PI)作为一种特种工程塑料而被广泛应用,但由于PI的熔融性能较差,产业化发展受到了限制。通过对热固性PI进行改性开发出的热塑性聚酰亚胺(TPI),其熔融性能和加工性能相对热固性PI有了质的提升,能够应用于柔性覆铜板、3D打印等领域。本文概述了TPI的合成方法及热学、力学、加工性能,总结了TPI在柔性线路板及其他重要工业领域的应用,提出了TPI未来的研究方向。

热塑性聚酰亚胺  /  合成方法  /  性能  /  研究进展  /  应用现状

Polyimide (PI) has been widely used as a kind of special engineering plastic. However, the further industrialization development of PI is limited due to its poor melting property. Thermoplastic polyimide (TPI) is developed by modifying the thermosetting PI, and its melting property and processability are improved qualitatively compared to thermosetting PI, so that it can be applied to flexible copper clad laminate, 3D printing and other fields. In this paper, the synthetic method, thermal, mechanical, and processing properties of TPI were summarized, and the application of TPI in flexible printed circuit and other important industrial fields were concluded. The future research directions of TPI were proposed.

thermoplastic polyimide  /  synthetic method  /  performance  /  research progress  /  application status
刘存生, 陈钰玮, 曹景茹, 刘佳, 马小华, 刘屹东, 闵永刚. 热塑性聚酰亚胺的研究及应用进展. 绝缘材料, 2021 , 54 (4) : 1 -7 . DOI: 10.16790/j.cnki.1009-9239.im.2021.04.001
Cunsheng LIU, Yuwei CHEN, Jingru CAO, Jia LIU, Xiaohua MA, Yidong LIU, Yonggang MIN. Research and Application Progress of Thermoplastic Polyimide[J]. Insulating Materials, 2021 , 54 (4) : 1 -7 . DOI: 10.16790/j.cnki.1009-9239.im.2021.04.001
聚酰亚胺(polyimide,PI)是指主链上含有酰亚胺环的一类聚合物[1-2],结构如图1所示,其中含有酞酰亚胺环结构的聚合物尤为重要。这类聚合物具有优异的综合性能,是一种具有高耐热性的材料[3]
PI按结构可以分为热固性PI和热塑性PI。其中热固性PI是已完成亚胺化的主链或侧链上带有活性基团的小分子、低聚物或预聚体,在热作用下反应形成交联的PI[4],其属于化学交联的产物,如果发生固化,将不具备再成型的能力;热塑性PI是主链上含有亚胺环和芳香环,具有链形结构的聚合物,在其加工过程中不会发生化学交联,因此可以在熔融加工过程中再次成型。
热塑性聚酰亚胺(TPI)是在传统热固性PI的基础上开发的[5],与热固性PI相比,TPI具有许多潜在的优势。首先,TPI具有出色的热稳定性、耐腐蚀性、韧性和耐损伤性,以及生产周期短、操作简单、制造成本低等优势[4]。其次,TPI可熔化和重新加工,因此可以通过加热和加压来修复受损结构[5]。最后,TPI在环境友好方面具有优势[6-7],它是完全酰亚胺化的聚合物,不包含任何反应性化学物质,因此毒性非常低。由于加热熔融特性和在溶剂中的再溶解性,TPI可以被回收或与市场上的其他回收材料结合制成新产品[8]
20世纪50年代,TPI开始进入人们的视野并逐渐发展。到60年代,TPI开始走向商品化和工业化。80年代初期,美国通用电气公司(GE)研发出一种聚醚酰亚胺(PEI),缩合型PI类产品逐渐被国际市场上接受[9]。1997年,日本三井公司报道了一种可以注射和挤出成型的新型TPI(Aurum®)塑料颗粒[10]。2006年底,美国通用电气公司制备了一款全新的PEI,使该材料的耐热温度从220℃提高到了300℃。
TPI的结构如图2所示[5]。为了提升TPI的熔融加工性,人们以它的化学结构与性能(如玻璃化转变温度Tg、熔融能力等)之间的关系为基础进行了探索,提出了以下几种方法:①在主链中引入柔性基团(醚键、酮键、六氟异丙基等)[11-12],柔性基团可以提升分子链的柔顺性,增大分子间的自由体积,改善TPI的熔融性,但是会降低TPI的耐热性[13];②在主链上引入大的侧基[14],降低主链的规整度,提高TPI的溶解性,但是此种方法合成成本较高、工艺复杂,不能大规模生产;③采用共聚合的方法,使用不同的二胺和二酐单体进行无规共聚合成,由于单体结构的不同,会降低分子链的规整性和柔顺性,进而降低分子链的相互作用力和刚性,增强熔融性;④引入扭曲的非共平面结构,破坏分子链的对称性,增大分子链旋转阻力,提高Tg;⑤引入含氟基团[15],例如三氟甲基,它的大体积会使得分子链的规整度降低,分子链之间的空隙变大,从而有效提高TPI的熔融性。另外含氟基团对多种溶剂都有亲和作用,因此合成的TPI溶解性能优良,但是含氟单体的成本太高,因此无法进行量产[16]
根据上述方法,现已开发出多种性能优良的TPI产品,依据不同单体芳香族的结构,将TPI分为6类,如表1所示。
TPI通常采用一步法或者两步法制备。
一步法:在高沸点有机溶剂中溶入二酐和二胺单体,并在加热条件下促进其发生聚合与亚胺化反应。为了防止TPI分子量降低,加入共沸物去除反应过程中产生的水,使得反应正向进行[17]。在反应过程中,一般使用极性非质子溶剂如甲酚、邻二氯苯等作为高沸点有机溶剂,使用硝基苯或者氯苯作为共沸物。此种方法合成的TPI具有很高的结晶度,分子链堆积较为有序[18],但由于反应在温度较高的环境中进行,这就要求TPI能够在高沸点有机溶剂中有一定的溶解度,并且此种方法仅适用于柔性聚合单体,因此应用范围受到了很大的限制。
两步法:首先将有机二胺单体溶解于极性非质子溶剂中,然后在溶液中加入有机二酐,根据不同的原料单体加入不同种类且稍微过量的封端剂(封端剂的主要作用是增强产物耐热性、控制分子量分布等),通过缩聚反应得到较高分子量的聚酰胺酸(PAA)[1,17],然后对PAA进行加工处理(纺丝或涂膜等)并去除溶剂后,进行热亚胺化或者化学亚胺化脱水形成TPI。热亚胺化是通过加热使PAA脱水后闭环形成TPI;化学亚胺化是PAA在催化剂(三乙胺或异喹啉等)和脱水剂(乙酸酐等)的作用下发生酰亚胺化形成TPI。两步法容易获得均匀拉伸且性能优异的TPI薄膜[19]。但是合成过程中也有不足:①PAA前驱体易水解,一直处于不稳定的状态;②在加工成型过程中会挥发大量溶剂,造成环境污染;③亚胺化反应会产生水,这可能导致体积变化引起分层,同时可能引起聚酰胺酸中间体发生水解。
一般来讲,TPI的耐热性相较于PI是降低的,因此对于Tg相对较低的TPI,热稳定性对于确保其在高温下的可加工性和功能性至关重要[20]。研究发现,使用结构不对称的二酐和柔性良好的二胺合成的TPI具有良好的热稳定性,并且在反应过程中,可以通过调节二胺或二酐的添加量来控制TPI链的刚性。LIU X等[21]使用双组分异构二酐、2,3′,3,4′-联苯四甲酸二酐(α-BPDA)和s-BPDA通过两步法合成了一系列具有良好耐热性的季铵共聚TPI薄膜,并与双组分二胺、4,4′-二氨基二苯醚(ODA)和1,3-双(4′-氨基苯氧基)苯(TPE-R)反应制备了具有良好耐热性的PI薄膜。随后以二胺与二酐的摩尔比作为变量进行研究,结果表明,这些四元共聚PI薄膜具有优异的热塑性和热稳定性。NI H J等[22]以2,3,3′,4′-二苯醚四酸二酐(α-ODPA)、双组分二胺ODA和对苯二胺(PDA)为原料,合成了一系列具有较高玻璃化转变温度的可热封共聚酰亚胺(CPIs)。结果表明,通过调节二胺比例可以调控PI链的刚性,同时由于α-ODPA不对称性和PDA刚性的协同作用,制备的薄膜具有良好的热封性和耐热性。马馨雨等[23]以2,2′-二甲基-4,4′-二氨基联苯(m-TB)为二胺单体,均苯四甲酸二酐(PMDA)和3,3′,4,4′-联苯四甲酸二酐(BPDA)为二酐单体,N,N-二甲基乙酰胺(DMAc)为溶剂,通过两步法制备了一系列具有不同二酐比例的TPI。结果表明,热塑性共聚物PI的初始分解温度高于500℃,并且在800℃时质量残留率大于50%,具有良好的热稳定性。但是以上方法合成的TPI大都具有坚固的主链,使得TPI的Tg很难调控。为了克服此缺点,A R NICHOLLS等[24]将芳香族二胺单体与作为亚甲基连接剂的4,4′-亚甲基双(2,6-二甲基苯胺)(MBDMA)掺入合成PI,然后使其与脂肪族聚醚二胺主链一起形成坚固的主链,进而增强刚性,该方法可以通过控制MBDMA与脂族聚醚胺的化学计量比以及聚醚胺本身的分子量来调控Tg
除了改变合成TPI的原料单体能够提升热稳定性外,研究TPI的热降解动力学和热降解过程对于提升TPI的热稳定性也具有一定的借鉴意义。SU X等[25]以2,2-二[4-(4-氨基苯氧基)苯基]丙烷(BAPP)、4,4′-二氨基二苯醚(ODA)和3,3′,4,4′-二苯四甲酸二酐(BTDA)为原料,采用两步法合成了PI-BTDA-BAPP和PI-BTDA-ODA-BAPP两种TPI。研究这两种TPI在不同升温速率下的热降解时发现,PI-BTDA-BAPP的热降解过程是一个简单的单级降解过程,而PI-BTDA-ODA-BAPP的降解过程是两级降解过程。通过比较活化能热和热失重温度,证明PI-BTDA-ODA-BAPP的热稳定性优于PI-BTDA-BAP。
TPI不仅具有比其他耐高温塑料更好的热稳定性,并且在力学、介电性能以及拉伸韧性[26]和尺寸稳定性[27]等方面也有较好的表现,一般通过添加一些共混物来诱导和促进其力学性能的提升。1994年,E M WOO等[28]建立了双酚E型二氰酸酯(BEDCy)与热塑性材料(聚砜或聚醚酰亚胺)二元共混物的模型,研究结果表明,随着热塑性材料含量的增加,共混物开始形成连续的热塑性相,而多氰酸酯连续相迅速下降,并且共混物的半互穿网络聚合物韧性显著提高。在此基础之上,LIU J等[29]以2,3,3′,4′-联苯四甲酸二酐(BPDA)、二氨基二苯醚(ODA)和2,2′二(三氟甲基)联苯胺(TFMB)为单体,采用一步法合成了具有较高Tg(360℃)的TPI。将合成的TPI溶解在双酚A型二氰酸酯(BADCy)中,经高温固化,制备出一系列具有半互穿的网络聚合物(semi-IPNs)。测试结果表明,共混物中的TPI促进了BADCy的固化反应,与纯聚氰尿酸盐相比,这些半互穿网络聚合物具有更好的力学和介电性能。TPI/BADCy良好的加工性能和材料性能使其有望用于高性能复合材料和胶黏剂。除此之外,对TPI共混材料进行二次加工(改性或添加相容剂)也是改善材料力学性能的另一种有效方法。YU L等[30]研究了聚对苯撑苯并双噁唑(PBO)纤维的稀土(RE)溶液表面改性对PBO纤维增强的热塑性聚酰亚胺(PBO/PI)复合材料拉伸性能的影响,结果表明,RE处理的PBO/PI复合材料的拉伸强度和拉伸模量随RE浓度的变化而变化,在RE浓度为0.6%时可获得最佳值。RE处理后,PBO纤维表面的氧碳比明显增大,表明其表面的极性基团含量有所增加。极性基团数量的增加增强了PBO纤维与PI基体之间的界面粘合力,从而增强了拉伸性能。GAO C等[31]制备了不同嵌段长度的新型聚醚醚酮-嵌段聚酰亚胺共聚物(PEEK-b-PI)。在聚醚醚酮/热塑性聚酰亚胺(PEEK/TPI)共混物中加入PEEK-b-PI作为相容剂,采用熔融挤出法制备了PEEK/TPI/PEEK-b-PI共混物,如图3所示。通过形态观察表明PEEK-b-PI的加入降低了界面张力,增强了界面粘附性,显著提高了PEEK/TPI共混物的力学性能。当PEEK-b-PI用量为5%时,共混物的断裂伸长率可提高200%左右。
TPI最大的优点是具有良好的熔融加工性,能够与其他材料进行复合,得到性能良好的产品。因此在TPI基体熔化的加工过程中,保证TPI拥有良好的结晶度和结晶速率对于其加工性能至关重要。V E YUDIN等[32]研究发现碳纳米管(CNT)可以诱导TPI成核,并且需要低浓度的CNTs即可诱导结晶。此后,他们研究了CNT、气相生长碳纤维(VGCF)、普通炭黑和石墨化炭黑4种填料对R-BAPB型PI(R表示1,4-双(3,4-二羧基苯氧基)苯,BAPB为4,4′-双(4-氨基苯氧基)联苯,它们合成后的产物简称为R-BAPB,如图4所示)的成核作用,结果发现,石墨化炭黑的成核效应最为明显,诱导R-BAPB型PI的结晶能力最强,可以有效提升TPI的熔融加工性33
此外,TPI具有易加工和易成形的特点。TPI的加工方法包括传统的模压、注塑和基于现代技术的3D打印。YANG H等[34]在封端剂存在下将芳族二酐与芳族二胺进行热缩聚反应,合成了具有可设计聚合物主链和可控分子量的新型TPI树脂。该TPI树脂可以通过添加填料如石墨、聚四氟乙烯(PTFE)[35]或二硫化钼(MoS2[36]进行改性,制成TPI模制颗粒,可以在高温下注塑成型得到TPI模压复合材料。
TPI具有高黏度、高黏性流动温度(Tf)以及较窄的加工温度范围,因此会产生热应力、分层等问题,进而导致3D打印成型较为困难。为了解决此类问题,WU W等[37]研究了打印温度对层间粘合性能的影响以及在不同打印温度下TPI 3D打印部件的SEM图像,结果表明,在320~340℃下,随着温度的升高,层间粘结力先增大后减小。YE W等[38-39]使用具有适当拉伸和弯曲强度的含3%碳纳米管的TPI(CNTs-TPI)复合材料来打印特征结构,如图5所示,通过优化3D打印参数,可以打印出具有特殊性能如导电、力学、耐热和电磁屏蔽性能的复杂零件。此后,他们又分别使用纯净的TPI、原始连续碳纤维增强TPI(OCC)和分离连续碳纤维增强TPI(SCC)为原料,研究了3D打印速度、层厚度和填充率对3D打印零件拉伸强度的影响。结果表明,SCC复合材料可以实现碳纤维在TPI基底中的均匀铺设,其拉伸强度比纯TPI样品高214%,比OCC样品高158%,弯曲强度比纯TPI样品高167%。SCC可以实现复杂零件的3D打印,具有优异的界面结合性能、力学性能和耐高温性能,可应用于航空航天等领域。
FCCL是生产柔性印制电路板(FPCB)的基本材料,由柔性绝缘底膜和金属箔组成,因此,FCCL的生产过程对电子产品的性能和外观有很大影响。TPI在FCCL领域的应用主要涉及两个方面[40]
(1)PI胶粘层材料[41-42]。制备多层柔性基底材料的传统方法是在热固性膜上涂抹基于环氧或丙烯酸的热固性粘合剂,然后与铜箔粘合固化。但是,FPCB的制备过程中需要焊接,并且焊接温度很高,环氧类粘合剂或丙烯酸的热稳定性较差,不能满足性能要求。因此,可以使用具有高耐热性的TPI代替丙烯酸或环氧树脂之类的热固化粘合剂来制备具有优异热稳定性的FPCB。
(2)直接覆合基膜[43-45]。在制造FPCB的过程中,粘合剂经常导致成品的尺寸稳定性差,而使用TPI直接覆盖铜箔可以很好地解决这个问题,这种技术被称为无胶覆铜板工艺。柔性覆铜板是铜和PI膜的复合材料,因此要制成高密度电路板,铜与PI膜的热膨胀系数α不能差别太大。PI薄膜的α一般为3.0×10-5~6.0×10-5/℃,而常见金属铜的α为1.6×10-5~1.9×10-5/℃。因此,开发一种适合铜的热膨胀系数的TPI薄膜变得格外重要,这也是实现直接覆合的前提。
TPI具有热稳定性、耐摩擦性、抗腐蚀性和可加工性等优点,因此可以将其加工成型或者与其他材料复合制造出性能优异的产品,应用于医疗、电子、化工等领域,表2列出了TPI在部分领域的产业化应用情况。
近年来,与TPI相关的产品应用在许多高科技和高端领域中,最主要原因是TPI不仅具有不弱于PI的综合性能,而且具有优良的热加工性,可以对其进行二次加工,在很大程度上拓展了TPI的应用领域。目前TPI的研究重点主要有:①通过探索不同种类的具有不对称结构的二酐与柔性基团的二胺单体或者改性的方法,进一步开发出具有较高Tg与优异热稳定性的TPI;②开发研究合适的碳类填料,用来诱导TPI在加工过程中的成核结晶,提高TPI基体在融化过程中的结晶度与结晶速率;③在3D打印领域,通过探索新型TPI复合材料或者控制打印温度来降低TPI的黏度和黏流温度(Tf),解决TPI在加工过程中出现的强度低、难以成型等问题;④在不降低TPI综合性能的基础上,开发出廉价的合成单体,降低TPI生产成本。
未来,随着诸多领域产业化的需求,TPI的开发将更为深入,但是在对TPI的一些性能,诸如抗摩擦性、抗辐射、阻燃性等方面的开发利用仍有所不足,因此借鉴其他热塑性材料的产业开发,进一步对TPI进行产业化研究将是TPI的一个发展方向。
  • 广东省“珠江人才计划”引进创新创业团队(2016ZT060412)
  • 广东工业大学百人计划(220418095)
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2021年第54卷第4期
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doi: 10.16790/j.cnki.1009-9239.im.2021.04.001
  • 接收时间:2020-05-17
  • 首发时间:2026-01-26
  • 出版时间:2021-04-20
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  • 收稿日期:2020-05-17
  • 修回日期:2020-06-20
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广东省“珠江人才计划”引进创新创业团队(2016ZT060412)
广东工业大学百人计划(220418095)
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    1广东工业大学 材料与能源学院,广东 广州 510006
    2东莞华南设计创新院,广东 东莞 523808

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刘屹东(1974-),男(汉族),吉林人,教授,主要从事高性能材料与器件的研究。
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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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