TIME AND TEMPERATURE DEPENDENCE OF PHASE-SEPARATION BEHAVIOR FOR POLY(N-METHYL METHACRYLIMIDE)/POLY(VINYLIDENCE FLUORIDE) BLENDS

HU Huixia; SHANGGUAN Yonggang; ZUO Min; ZHENG Qiang

doi:10.3724/SP.J.1105.2009.00123

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TIME AND TEMPERATURE DEPENDENCE OF PHASE-SEPARATION BEHAVIOR FOR POLY(N-METHYL METHACRYLIMIDE)/POLY(VINYLIDENCE FLUORIDE) BLENDS

Research Article | 更新时间：2021-03-19

- TIME AND TEMPERATURE DEPENDENCE OF PHASE-SEPARATION BEHAVIOR FOR POLY(N-METHYL METHACRYLIMIDE)/POLY(VINYLIDENCE FLUORIDE) BLENDS
- Acta Polymerica Sinica Issue 2, Pages: 123-127(2009)
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- DOI：10.3724/SP.J.1105.2009.00123
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- Published：20 February 2009，
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HU Huixia, SHANGGUAN Yonggang, ZUO Min, ZHENG Qiang. TIME AND TEMPERATURE DEPENDENCE OF PHASE-SEPARATION BEHAVIOR FOR POLY(N-METHYL METHACRYLIMIDE)/POLY(VINYLIDENCE FLUORIDE) BLENDS. [J]. Acta Polymerica Sinica (2):123-127(2009)
DOI：

HU Huixia, SHANGGUAN Yonggang, ZUO Min, ZHENG Qiang. TIME AND TEMPERATURE DEPENDENCE OF PHASE-SEPARATION BEHAVIOR FOR POLY(N-METHYL METHACRYLIMIDE)/POLY(VINYLIDENCE FLUORIDE) BLENDS. [J]. Acta Polymerica Sinica (2):123-127(2009) DOI： 10.3724/SP.J.1105.2009.00123.

摘要

用小角激光光散射（SALLS）研究了聚( N-甲基甲基丙烯酰亚胺)/聚偏氟乙烯（PMMI/PV DF）共混体系的相分离行为. 通过升温法获得了PMMI/PVDF体系的浊点温度，发现体系的浊点温度强烈依赖于升温速率，呈明显的非线性关系，即升温速率大于1 K#8226;min-1时，升温速率是影响 I(t) 的唯一因素；升温速率较小时，高分子链松弛速率的差别得以体现，则该情况下升温速率与松弛速率共同影响浊点温度. 该体系具有典型的最低临界共溶温度（LCST）特征. 恒温法相分离结果表明，在实验温度范围内该体系相分离行为对温度的依赖性遵循时温叠加（time-temperature superposition

TTS）原理.

Abstract

The liquid-liquid phaseseparation (LLPS) behavior of poly(N-methyl methacrylimide)/poly(vinylidene fluoride) (PMMI/PVDF) blends was studied by using small angle laser light scattering (SALLS)

and the timetemperature dependence of phase-separation behavior was discussed.According to examining the dependence of cloud points (Tc) on heating rate for PMMI/PVDF blends

it was found that Tc decreased as the temperature droped nonlinearly.When the heating rate was higher than 1.0 K/min

only the heating rate could affect the relative intensity I(t)

and the difference of relaxation rate of polymer chain was difficult to be distinguished.Contrarily

both heating rate and relaxation rate of polymer chains could affect the cloud points of PMMI/PVDF blends at lower heating rates because there was enough time for the chain relaxation

and the different relaxation rates could result in the change of Tc.The cloud point curve of PMMI/PVDF blend was obtained at the heating rate of 1 K/min-1.The thermal behavior of PMMI/PVDF blends was measured by differential scanning calorimetry (DSC) and dynamic mechanical analysis (DMA).It was found that PMMI/PVDF exhibited a typical low critical solution temperature (LCST) behavior.Moreover

the temperature dependence of phase-separation kinetics for PMMI/PVDF blends followed the principle of time-temperature superposition (TTS) at the early phase-separation stage and may be described with a WLF-like equation.

关键词

聚(N-甲基甲基丙烯酰亚胺)/聚偏氟乙烯相分离时温依赖性

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