Article(id=1308544320341373652, tenantId=1146029695717560320, journalId=1263187385517883426, issueId=1308544285121798644, articleNumber=null, orderNo=null, doi=10.14062/j.issn.0454-5648.20250624, pmid=null, cstr=null, oa=null, hot=null, price=null, onlineType=0, articleFormat=0, articleType=null, articleTypeStr=null, receivedDate=1756224000000, receivedDateStr=2025-08-27, revisedDate=1757347200000, revisedDateStr=2025-09-09, acceptedDate=null, acceptedDateStr=null, onlineDate=1789910877547, onlineDateStr=2026-09-20, pubDate=1775664000000, pubDateStr=2026-04-09, doiRegisterDate=null, doiRegisterDateStr=null, onlineIssueDate=1789910877547, onlineIssueDateStr=2026-09-20, onlineJustAcceptDate=null, onlineJustAcceptDateStr=null, onlineFirstDate=null, onlineFirstDateStr=null, sourceXml=null, magXml=null, createTime=1789910877547, creator=13701087609, updateTime=1789910877547, updator=13701087609, issue=Issue{id=1308544285121798644, tenantId=1146029695717560320, journalId=1263187385517883426, year='2026', volume='54', issue='5', pageStart='1499', pageEnd='1880', issueExtLink='null', onlineDate='null', pubDate='1779206400000', pubDateStr='2026-05-20', beforeIssueId=null, nextIssueId=null, price=null, status=1, issueComplete=1, articleOrder=1, issueType=-1, specialIssue=null, createTime=1789910869150, creator='13701087609', updateTime=1789955421627, updator='13701087609', preIssue=null, nextIssue=null, articleTotal=null, ext={EN=IssueExt(id=1308731151825600702, tenantId=1146029695717560320, journalId=1263187385517883426, issueId=1308544285121798644, language=EN, specialIssueTitle=, coverIllustrator=null, specialIssueEditor=, specialIssueAbout=), CN=IssueExt(id=1308731151825600703, tenantId=1146029695717560320, journalId=1263187385517883426, issueId=1308544285121798644, language=CN, specialIssueTitle=, coverIllustrator=null, specialIssueEditor=, specialIssueAbout=)}, issueFiles=null, downloadFileDto=null}, startPage=1749, endPage=1757, ext={EN=ArticleExt(id=1308544320542700245, articleId=1308544320341373652, tenantId=1146029695717560320, journalId=1263187385517883426, language=EN, title=Molecular Dynamics Study on Interfacial Bonding Mechanism of Polyvinyl Pyrrolidone-co-Polyacrylic Acid Modified Glass Fibers and Calcium Silicate Hydrate, columnId=1308544319938724209, journalTitle=Journal of the Chinese Ceramic Society, columnName=Special Issue on Strengthening, Toughening of Cement-Based Materials and Composite Material—Research Articles, runingTitle=null, highlight=null, articleAbstract=
Introduction

Glass fiber reinforced cement is utilized in construction field. Interfacial modification with coupling agents and functional polymers represents a critical strategy to enhance interfacial bonding. However, molecular mechanisms remain insufficient. In this study, molecular dynamics were used to evaluate interfacial responses of C-S-H/glass fiber modified with KH-570 and poly (vinylpyrrolidone-co-acrylic acid) (PVP-co-PAA). The results demonstrated that KH-570 induced marginal increase, while PVP-co-PAA led to remarkable enhancement. The analyses of coordination number, bond lifetime decay decoded interfacial bonding networks before and after modification. This study could reveal the distinct failure pathways and molecular mechanisms of interfacial bonding.

Methods

All the MD simulations were performed based on a package named LAMMPS. Firstly, all the systems were relaxed under NVT ensemble last for 5 ns, with timestep 1 fs and 300 K. Temperature control was achieved by Nose-Hoover thermostat and damping parameter 0.1 ps. The bottom Ca layers of C-S-H were fixed throughout the simulation to prevent model rotation. An additional 2 ns relaxation was conducted and trajectories were recorded every 1 ps. During the shear simulations, spring forces were applied on atoms located at the top of SiO2 slab.

Results and discussion

The molecular dynamics (MD) simulations are employed to evaluate shear mechanical properties of C-S-H/SiO2, C-S-H/KH-570 and C-S-H/PVP-co-PAA interfaces. The molecular mechanisms of interfacial modification are thoroughly revealed via analyzing the types and dynamic behaviors of interfacial bonding networks. During dynamic failure, PVP-co-PAA exhibits a distinct behavior compared with rigid SiO2. Flexible polymer networks undergo conformational changes, leading to an increased shear displacement. The density analyses of bonding networks indicates that interfacial bonding networks can reorganize from OSiO2 —Ca—OC-S-H into OKH-570/OPVP-co-PAA—Ca—OC-S-H. Moreover, interfacial failure is decided by ionic bonding of OSiO2 /OKH-570/OPVP-co-PAA—Ca. The coordination number follows an increasing order of OSiO2 <OKH-570<OPVP-co-PAA, explaining the differences of interfacial mechanical strength.

Conclusions

The MD simulation revealed that PVP-co-PAA modification showed the most enhancement, with an improvement of 302.7%. The coordination number followed an increasing order of OSiO2 <OKH-570<OPVP-co-PAA. The time correlation function (TCF) also revealed that interfacial stability was enhanced after modification. Based on the coordination number and the TCF results, the differences of interfacial mechanical strength were explained. These findings could provide fundamental insights to guide the functional design of fiber-cement interfaces.

, authors=Gang QIAO, Pan WANG, Yue ZHANG, Muhan WANG, Dongshuai HOU, authorsList=Gang QIAO, Pan WANG, Yue ZHANG, Muhan WANG, Dongshuai HOU, authorCompany=null, correspAuthors=Dongshuai HOU, authorNote=

QIAO Gang (1996-), male, Doctor candidate. E-mail:

, correspAuthorsNote=
HOU Dongshuai (1986-), male, Ph.D., Professor. E-mail:
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玻璃纤维增强水泥复合材料广泛应用于建筑领域。偶联剂和功能聚合物的界面改性是增强界面粘结关键途径,然而其分子改性机理尚未阐明。本研究基于分子动力学方法,评价了γ-甲基丙烯酰氧基丙基三甲氧基硅烷(KH-570)、聚乙烯基吡咯烷酮-聚丙烯酸(PVP-co-PAA)对水化硅酸钙凝胶/玻纤界面改性的响应。结果显示:玻纤涂布KH-570提升效果较弱。KH-570进一步涂布PVP-co-PAA,界面力学性能提升了302.7%。剪切失效过程中,PVP-co-PAA不断调整构型,延缓了界面破坏,提升了剪切位移极限值。通过分析界面原子密度分布、化学键配位数及其稳定性,本研究系统解析了改性前后界面化学键的差异,阐明了界面粘结失效的差异性及其分子机理。

, authors=乔岗, 王攀, 张悦, 王慕涵, 侯东帅, authorsList=乔岗, 王攀, 张悦, 王慕涵, 侯东帅, authorCompany=null, correspAuthors=侯东帅, authorNote=

乔岗(1996—),男,博士研究生。

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侯东帅(1986—),男,博士,教授。
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乔岗 , 王攀 , 张悦 , 王慕涵 , 侯东帅
硅酸盐学报 | 水泥基材料增强增韧及其复合材料专题—研究论文 2026,54(5): 1749-1757
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硅酸盐学报 |水泥基材料增强增韧及其复合材料专题—研究论文 2026 , 54 (5) : 1749 -1757
基于分子动力学的聚乙烯基吡咯烷酮-聚丙烯酸改性玻璃纤维与水化硅酸钙界面粘结机理
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乔岗 , 王攀, 张悦, 王慕涵, 侯东帅
作者信息
  • 青岛理工大学土木工程学院,山东 青岛 266520
通讯作者:
侯东帅(1986—),男,博士,教授。
作者简介:

乔岗(1996—),男,博士研究生。

Molecular Dynamics Study on Interfacial Bonding Mechanism of Polyvinyl Pyrrolidone-co-Polyacrylic Acid Modified Glass Fibers and Calcium Silicate Hydrate
Gang QIAO , Pan WANG, Yue ZHANG, Muhan WANG, Dongshuai HOU
Affiliations
  • Department of Civil Engineering, Qingdao University of Technology, Qingdao 266520, Shandong, China
  • Corresponding Author:
    HOU Dongshuai (1986-), male, Ph.D., Professor. E-mail:

    QIAO Gang (1996-), male, Doctor candidate. E-mail:

出版时间: 2026-04-09 doi: 10.14062/j.issn.0454-5648.20250624
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玻璃纤维增强水泥复合材料广泛应用于建筑领域。偶联剂和功能聚合物的界面改性是增强界面粘结关键途径,然而其分子改性机理尚未阐明。本研究基于分子动力学方法,评价了γ-甲基丙烯酰氧基丙基三甲氧基硅烷(KH-570)、聚乙烯基吡咯烷酮-聚丙烯酸(PVP-co-PAA)对水化硅酸钙凝胶/玻纤界面改性的响应。结果显示:玻纤涂布KH-570提升效果较弱。KH-570进一步涂布PVP-co-PAA,界面力学性能提升了302.7%。剪切失效过程中,PVP-co-PAA不断调整构型,延缓了界面破坏,提升了剪切位移极限值。通过分析界面原子密度分布、化学键配位数及其稳定性,本研究系统解析了改性前后界面化学键的差异,阐明了界面粘结失效的差异性及其分子机理。

玻璃纤维表面改性  /  全原子分子动力学  /  界面剪切失效  /  界面化学键网络
Introduction

Glass fiber reinforced cement is utilized in construction field. Interfacial modification with coupling agents and functional polymers represents a critical strategy to enhance interfacial bonding. However, molecular mechanisms remain insufficient. In this study, molecular dynamics were used to evaluate interfacial responses of C-S-H/glass fiber modified with KH-570 and poly (vinylpyrrolidone-co-acrylic acid) (PVP-co-PAA). The results demonstrated that KH-570 induced marginal increase, while PVP-co-PAA led to remarkable enhancement. The analyses of coordination number, bond lifetime decay decoded interfacial bonding networks before and after modification. This study could reveal the distinct failure pathways and molecular mechanisms of interfacial bonding.

Methods

All the MD simulations were performed based on a package named LAMMPS. Firstly, all the systems were relaxed under NVT ensemble last for 5 ns, with timestep 1 fs and 300 K. Temperature control was achieved by Nose-Hoover thermostat and damping parameter 0.1 ps. The bottom Ca layers of C-S-H were fixed throughout the simulation to prevent model rotation. An additional 2 ns relaxation was conducted and trajectories were recorded every 1 ps. During the shear simulations, spring forces were applied on atoms located at the top of SiO2 slab.

Results and discussion

The molecular dynamics (MD) simulations are employed to evaluate shear mechanical properties of C-S-H/SiO2, C-S-H/KH-570 and C-S-H/PVP-co-PAA interfaces. The molecular mechanisms of interfacial modification are thoroughly revealed via analyzing the types and dynamic behaviors of interfacial bonding networks. During dynamic failure, PVP-co-PAA exhibits a distinct behavior compared with rigid SiO2. Flexible polymer networks undergo conformational changes, leading to an increased shear displacement. The density analyses of bonding networks indicates that interfacial bonding networks can reorganize from OSiO2 —Ca—OC-S-H into OKH-570/OPVP-co-PAA—Ca—OC-S-H. Moreover, interfacial failure is decided by ionic bonding of OSiO2 /OKH-570/OPVP-co-PAA—Ca. The coordination number follows an increasing order of OSiO2 <OKH-570<OPVP-co-PAA, explaining the differences of interfacial mechanical strength.

Conclusions

The MD simulation revealed that PVP-co-PAA modification showed the most enhancement, with an improvement of 302.7%. The coordination number followed an increasing order of OSiO2 <OKH-570<OPVP-co-PAA. The time correlation function (TCF) also revealed that interfacial stability was enhanced after modification. Based on the coordination number and the TCF results, the differences of interfacial mechanical strength were explained. These findings could provide fundamental insights to guide the functional design of fiber-cement interfaces.

glass fiber surface modification  /  all-atom molecular dynamics  /  interfacial shear failure  /  interfacial bonding network
乔岗, 王攀, 张悦, 王慕涵, 侯东帅. 基于分子动力学的聚乙烯基吡咯烷酮-聚丙烯酸改性玻璃纤维与水化硅酸钙界面粘结机理. 硅酸盐学报, 2026 , 54 (5) : 1749 -1757 . DOI: 10.14062/j.issn.0454-5648.20250624
Gang QIAO, Pan WANG, Yue ZHANG, Muhan WANG, Dongshuai HOU. Molecular Dynamics Study on Interfacial Bonding Mechanism of Polyvinyl Pyrrolidone-co-Polyacrylic Acid Modified Glass Fibers and Calcium Silicate Hydrate[J]. Journal of the Chinese Ceramic Society, 2026 , 54 (5) : 1749 -1757 . DOI: 10.14062/j.issn.0454-5648.20250624
  • 国家重点研发计划(2022YFE0133800)
  • 国家自然科学基金项目(52178221)
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doi: 10.14062/j.issn.0454-5648.20250624
  • 接收时间:2025-08-27
  • 首发时间:2026-09-20
  • 出版时间:2026-04-09
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  • 收稿日期:2025-08-27
  • 修回日期:2025-09-09
基金
国家重点研发计划(2022YFE0133800)
国家自然科学基金项目(52178221)
作者信息
    青岛理工大学土木工程学院,山东 青岛 266520

通讯作者:

侯东帅(1986—),男,博士,教授。
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2种不同金属材料的力学参数
科
Family
属数
Number of
genus
种数
Number of
species
占总种数比例
Percentage of
total species (%)
属
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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