Effect of polymer structure on the molecular dynamics and thermal behavior of poly(allyl acetoacetate) and copolymers

被引：9

作者：

Grzybowska, Katarzyna ^{[1
]}

Wojnarowska, Zaneta ^{[1
]}

Grzybowski, Andrzej ^{[1
]}

Paluch, Marian ^{[1
]}

Giussi, Juan M. ^{[2
]}

Cortizo, M. Susana ^{[2
]}

Blaszczyk-Lezak, Iwona ^{[3
]}

Mijangos, Carmen ^{[3
]}

机构：

[1] Univ Silesia, Inst Phys, PL-40007 Katowice, Poland

[2] CONICET CCT La Plata, Fac Ciencias Exactas, Inst Invest Fisicoquim Teor & Aplicadas INIFTA, Lab Estudio Compuestos Orgin LADECOR, La Plata, Argentina

[3] CSIC, Inst Ciencia & Tecnol Polimeros, E-28006 Madrid, Spain

来源：

POLYMER | 2014年 / 55卷 / 04期

关键词：

Copolymers; Molecular dynamics; Glass transition; DIBLOCK COPOLYMERS; SEGMENTAL DYNAMICS; GLASS-TRANSITION; BLOCK-COPOLYMERS; DIELECTRIC-RELAXATION; TEMPERATURE-DEPENDENCE; SPECTROSCOPY; BLENDS; HETEROGENEITY; METHACRYLATE;

D O I：

10.1016/j.polymer.2014.01.006

中图分类号：

O63 [高分子化学（高聚物）];

学科分类号：

070305 ; 080501 ; 081704 ;

摘要：

In this paper, dielectric and calorimetric studies of the small-molecule glass former ally! acetoacetate monomers as well as its newly synthetized homopolymer and copolymers with different styrene composition were performed in both the liquid and glassy states. The molecular dynamics studies by the broadband dielectric spectroscopy and the stochastic temperature modulated differential scanning calorimetry enabled us to explore relaxation processes of examined materials in the wide frequency range. We found that the copolymers reveal two co-existing glass transitions characterized by the glass transition temperatures, which are very close to those of the corresponding homopolymers. These results suggest that the copolymers exhibited some sequences of acetoacetate units with a microphase-separated morphology in agreement with the value of reactivity ratio previously determined. We investigated effects of copolymerization compositions on the glass transition temperature, the isobaric fragility index, the dielectric and calorimetric intensity, and the dynamic heterogeneity on the glass transitions of the materials. (C) 2014 Elsevier Ltd. All rights reserved.

引用

页码：1040 / 1047

页数：8

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