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首页> 外文期刊>Journal of Applied Polymer Science >Poly(acrylonitrile-co-methyl acrylate) copolymers: Correlation between copolymer composition, morphology and positron annihilation lifetime parameters
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Poly(acrylonitrile-co-methyl acrylate) copolymers: Correlation between copolymer composition, morphology and positron annihilation lifetime parameters

机译：聚（丙烯腈-丙烯酸甲酯）共聚物：共聚物组成，形态与正电子an灭寿命参数之间的相关性

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摘要

A series of poly(acrylonitrile-co-methyl acrylate) copolymers of differing copolymer compositions are synthesized through free radical emulsion copolymerisation of methyl acrylate (MA) and acrylonitrile (AN) and by variation of the monomer feed ratios. The copolymers are characterized by NMR, SEC, WAXD, DMA, and positron annihilation lifetime spectroscopy. Results show that, there is a linear decrease in the glass transition temperature (T_g) of the copolymers and the MA content. There is also a progressive decrease in the crystallinity of the copolymers with increasing MA content. Positron results show a sigmoidal variation in the ortho positronium lifetime with an increasing MA content. The low MA content, semi-crystalline copolymers show a positive deviation from the linear additive relationship between the o-Ps lifetime and MA content, whereas the higher MA content amorphous copolymers show a negative deviation from the linear additive behavior. The o-PS intensity shows a linear behavior with MA content with a slight deviation from the additive linear behavior for the very high-content MA copolymer. These variations in the measured positron lifetime parameters are interpreted in terms of the copolymer morphology.
机译：通过丙烯酸甲酯（MA）和丙烯腈（AN）的自由基乳液共聚反应以及通过改变单体进料比来合成一系列具有不同共聚物组成的聚（丙烯腈-丙烯酸甲酯）共聚物。共聚物的特征在于NMR，SEC，WAXD，DMA和正电子an灭寿命光谱。结果表明，共聚物的玻璃化转变温度（T_g）和MA含量呈线性下降。随着MA含量的增加，共聚物的结晶度也逐渐降低。正电子结果表明，随着MA含量的增加，正电子寿命的S型变化。 MA含量低的半结晶共聚物与o-Ps寿命和MA含量之间的线性加成关系呈正偏差，而MA含量较高的非晶态共聚物与线性加成行为呈负相关。 o-PS强度显示出具有MA含量的线性行为，与非常高含量的MA共聚物的加成线性行为略有偏差。所测量的正电子寿命参数的这些变化是根据共聚物的形态来解释的。

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