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氢键对P(MMA—co—MAAM)共聚物T_g的影响 被引量:1

Effect of hydrogen bond on T_g of P(MMA—co—MAAM) copolymers
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摘要 通过分子设计,选择具有质子供体(H—N)和质子受体(C=O)的甲基丙烯酰胺(MAAM)与甲基丙烯酸甲酯(MMA)为共聚单体,合成了不同单体配比的甲基丙烯酸甲酯-甲基丙烯酰胺共聚物(P(MMA—co—MAAM)).利用傅里叶红外光谱仪、示差扫描量热分析和流变仪表征其化学结构、玻璃转变行为和溶液流变特性.结果表明,P(MMA—co—MAAM)为无规共聚物,分子内存在强的氢键相互作用.随着MAAM单体的引入,P(MMA—co—MAAM)共聚物的玻璃化温度(Tg)呈现先升高后降低的趋势,明显高于PMMA和PMAAM的加和值.共聚物溶液表现出剪切增稠的流变行为. A series of P(MMA—co—MAAM) copolymers with different composition were synthesized by radical solution copolymerization of methyl methacrylate(MMA) and methacrylamide(MAAM) with proton acceptor(C=O) and donor(H—N).Their chemical structure,glass transition and rheological behaviors were characterized by Fourier transform infrared spectroscopy,differential scanning calorimetry and rheometer.The results showed that P(MMA—co—MAAM) is random copolymer,and there exists strong intra-molecular hydrogen bonds.Its glass transition temperature(Tg) first increases with the content of MAAM in copolymer,then tends to decrease.And Tg of P(MMA—co—MAAM) is higher than the additive values of PMMA,PMAAM.Moreover,the P(MMA—co—MAAM) solution exhibits shear-thickening behavior.
出处 《华中科技大学学报(自然科学版)》 EI CAS CSCD 北大核心 2010年第2期59-62,共4页 Journal of Huazhong University of Science and Technology(Natural Science Edition)
基金 国家自然科学基金杰出青年基金资助项目(50825301)
关键词 合成材料 丙烯酸树脂 氢键 玻璃转变 共聚合 synthetic materials acrylic resin hydrogen bond glass transition copolymerization
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共引文献15

同被引文献11

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