Double Glass Transitions and Interfacial Immobilized Layer in in-Situ-Synthesized Poly(vinyl alcohol)/Silica Nanocomposites

被引：112

作者：

Chen, Lin ^{[1
]}

Zheng, Kang ^{[1
]}

Tian, Xingyou ^{[1
]}

Hu, Kun ^{[1
]}

Wang, Ruoxi ^{[1
]}

Liu, Chen ^{[1
]}

Li, Yong ^{[2
]}

Cui, Ping ^{[1
,2
]}

机构：

[1] Chinese Acad Sci, Key Lab Mat Phys, Inst Solid State Phys, Hefei 230031, Peoples R China

[2] Chinese Acad Sci, Ningbo Inst Mat Technol & Engn, Ningbo 315201, Zhejiang, Peoples R China

来源：

MACROMOLECULES | 2010年 / 43卷 / 02期

关键词：

MOLECULAR-DYNAMICS; RELAXATION DYNAMICS; SEGMENTAL DYNAMICS; FILLED POLYMERS; CRYSTALLIZATION; BEHAVIOR; TEMPERATURE; MORPHOLOGY;

D O I：

10.1021/ma901267s

中图分类号：

O63 [高分子化学（高聚物）];

学科分类号：

070305 ; 080501 ; 081704 ;

摘要：

The results of dynamic mechanical analysis (DMA) revealed that there were double tan 6 peaks in tile poly(vinyl alcohol)(PVA)/silica nanocomposite samples at low frequencies. The two relaxations attribute to glass transition for PVA matrix and motions of segments for PVA chains confined by the surface of silica nanoparticles, respectively. The thickness of the interfacial immobilized layer was calculated, and. schematic models were founded, which can well interpret tile results. The changes of the two relaxations with various silica contents at different frequencies are discussed. It is considered that most of the interfacial PVA chains probably span the two layers. The peak position of the first relaxation moves to high temperature With the increase of frequency for strain tag of the sample whereas tile second one shifts to low temperature for tile "drag effect" between the intrinsic and interfacial segments of the spanned PVA chains.

引用

页码：1076 / 1082

页数：7

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