Confined Crystallization Behaviors in Polyethylene/Silica Nanocomposites: Synergetic Effects of Interfacial Interactionsand Filler Network
Confined Crystallization Behaviors in Polyethylene/Silica Nanocomposites: Synergetic Effects of Interfacial Interactionsand Filler Network
复制标题
聚乙烯/二氧化硅纳米复合材料的限域结晶行为：界面相互作用和填料网络的协同效应
DOI：
10.1002/polb.24291
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发表时间：
2017
期刊：
影响因子：
--
通讯作者：
Wang Dujin
中科院分区：
文献类型：
--
作者：
Zhao Weiwei;Su Yunlan;Gao Xia;Qian Qingyun;Chen Xin;Wittenbrink Robert;Wang Dujin
纳米粒子引入的约束效应影响聚合物纳米复合材料的相行为，从而影响聚合物纳米复合材料的性能。本研究采用DSC、XRD和1H固体NMR相结合的方法，系统研究了三种SiO2纳米粒子（未改性SiO2、疏水改性SiO2、SiO2-APTES（3-氨丙基三乙氧基硅烷）和SiO2-PTES（正丙基三乙氧基硅烷））复合聚乙烯（PE）的分子动力学和结晶行为。由于纳米SiO2粒子与PE之间的界面作用增强，PE的结晶稳定性和链迁移率均表现为未改性SiO2< SiO2-APTES < SiO2-PTES。此外，当SiO2含量达到83wt%时，三种纳米复合材料均形成了独立于聚合物-纳米粒子相互作用的二氧化硅网络。聚合物链的移动性受到这种网状结构的严重限制，导致纳米复合材料的结晶能力出现转折点，并在45 °C下出现比纯PE低的新结晶峰。本工作深入研究了界面相互作用和填料网络对聚合物结晶的协同作用，为改性和设计性能可控的纳米复合材料提供了指导。© 2017威利期刊公司. J.波利姆科学，部分B：聚合物物理2017，55，498-505
The confinement effects introduced by nanoparticles have been reported to influence the phase behaviors thus the properties of polymer nanocomposites. In this study, molecular dynamics and crystallization behaviors of polyethylene (PE) composited with three types of silica (SiO2) nanoparticles, namely unmodified SiO2, hydrophobically modified SiO2, SiO2‐APTES (3‐aminopropyltriethoxysilane) and SiO2‐PTES (n‐propyltriethoxysilane), were systematically investigated via a combination of DSC, XRD and1H solid‐state NMR measurements. The suppressions in crystallization and chain mobilities of PE rank in the order of unmodified SiO2< SiO2‐APTES < SiO2‐PTES due to the increasing interfacial interactions between PE and SiO2nanoparticles. Additionally, independent of polymer–nanoparticle interactions, a silica network forms for all three kinds of nanocomposites when SiO2content reaches 83 wt %. The mobilities of polymer chains are severely restricted by such a percolated network structure, leading to a turning point in the crystallization ability of nanocomposites and a new crystallization peak at 45 °C lower than that of pure PE. The synergetic effects of interfacial interactions and filler network on polymer crystallization have been thoroughly studied in this work, which will provide guidance on modifying and designing nanocomposites with controlled properties. © 2017 Wiley Periodicals, Inc. J. Polym. Sci., Part B: Polym. Phys.2017,55, 498–505