Glass transition of thin films of poly(2-vinyl pyridine) and poly(methyl methacrylate): nanocalorimetry measurements

被引：28

作者：

Efremov, MY

Olson, EA

Zhang, M

Allen, LH ^{[1
]}

机构：

[1] Univ Illinois, Dept Mat Sci & Engn, Urbana, IL 61801 USA

[2] Univ Illinois, Coordinated Sci Lab, Urbana, IL 61801 USA

来源：

THERMOCHIMICA ACTA | 2003年 / 403卷 / 01期

关键词：

nanocalorimetry; glass transition; poly(2-vinyl pyridine); poly(methyl methacrylate); calorimetry;

D O I：

10.1016/S0040-6031(03)00122-9

中图分类号：

O414.1 [热力学];

学科分类号：

摘要：

Glass transitions were observed in thin films of poly(2-vinyl pyridine) (P2VP) and poly(methyl methacrylate) (PMMA) using a scanning nanocalorimetry technique which has both high sensitivity (10(-9) J/K) and high scan rates (10(4)-10(5) K/s). Samples were deposited by the spin-cast method. The thickness of samples was 100-400 nm. Glass transition temperature, obtained by nanocalorimetry, is shifted toward higher temperatures by 10-20 K and activation enthalpy of glass transition is shifted to lower values by factor of 2-4. The glass transition characteristics of both polymers are discussed in terms of the standard Tool-Narayanaswamy-Moynihan (TNM) multi-parameter model. (C) 2003 Elsevier Science Ltd. All rights reserved.

引用

页码：37 / 41

页数：5

共 17 条

[1]

*ASTM, E135698 ASTM, V14

[2] Discrete periodic melting point observations for nanostructure ensembles [J].