Combined FTIR and Dielectric Investigation of Poly(vinyl acetate) Adsorbed on Silica Particles

被引：193
作者：
Fuellbrandt, Marieke [1 ]
Purohit, Purv J. [1 ]
Schoenhals, Andreas [1 ]
机构：
[1] BAM Bundesanstalt Mat Forsch & Prufung, D-12205 Berlin, Germany
来源：
MACROMOLECULES | 2013年 / 46卷 / 11期
关键词：
GLASS-TRANSITION; MOLECULAR-DYNAMICS; POLY(METHYL METHACRYLATE); CHARACTERISTIC LENGTH; IN-SITU; POLYMERS; RELAXATION; NANOCOMPOSITES; SPECTROSCOPY; BEHAVIOR;
D O I：
10.1021/ma400461p
中图分类号：
O63 [高分子化学（高聚物）];
学科分类号：
070305 ; 080501 ; 081704 ;
摘要：
Samples with different amounts of poly(vinyl acetate) adsorbed on silica particles were prepared in order to study their interfacial interactions and dynamics. The interface of adsorbed polymers to a substrate plays an important role in many applications such as polymer nanocomposites, thin films, and coatings. Characterization of such interfaces is thus of high importance since they were found to differ from bulk properties. Thermogravimetric analysis (TGA) is applied to analyze the amounts of polymer adsorbed on silica particles. Broadband dielectric spectroscopy (BDS) is employed in a broad frequency (10(-1)-10(6) Hz) and temperature range (178-423 K) in order to probe the polymer/silica interface. Two relaxation processes can be identified for the composites: one corresponding to the bulklike polymer and a second one related to polymer chains close to the silica surface. For the latter the dynamic glass transition is shifted to higher temperature due to reduced mobility. This effect is investigated in dependence on the polymer content Further investigations are done to obtain information about bound and free carbonyl fractions of poly(vinyl acetate) using Fourier transform infrared spectroscopy (FTIR) measurements.
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收藏
页码：4626 / 4632
页数：7
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