| PEO分子量对POM/PEO晶/晶共混物溶液结晶的影响 |
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| 引用本文： | 武慧智,白时兵,王琪.PEO分子量对POM/PEO晶/晶共混物溶液结晶的影响[J].高分子通报,2012(7):84-90. |
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| 作者姓名： | 武慧智 白时兵 王琪 |
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| 作者单位： | 高分子材料工程国家重点实验室四川大学高分子研究所,成都,610065 |
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| 基金项目： | 国家自然科学基金资助项目 |
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| 摘 要： | 以六氟异丙醇(HFIP)为聚甲醛(POM)与聚氧化乙烯(PEO)的共溶剂,通过溶液结晶研究了PEO分子量对POM/PEO 50/50晶/晶共混物结晶行为及结晶形态的影响。结果表明,PEO分子量越小,POM与PEO在结晶过程中相互干扰越大。当PEO分子量为4×103时,共混物中POM形成部分不完善晶体,出现明显的熔融双峰。SEM结果表明:含不同分子量PEO的共混晶体均无明显相分离,且低分子量PEO的共混物更易形成规整球晶,认为通过溶液结晶,POM/PEO 50/50共混物中POM与PEO形成了晶体相互穿插的结晶结构。
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| 关 键 词： | 聚甲醛 聚氧化乙烯 溶液结晶 |
Effect of Molecular Weight of PEO on Solution Crystallization of POM/ PEO Blend |
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| WU Hui-zhi,BAI Shing-bin,WANG Qi.Effect of Molecular Weight of PEO on Solution Crystallization of POM/ PEO Blend[J].Polymer Bulletin,2012(7):84-90. |
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| Authors: | WU Hui-zhi BAI Shing-bin WANG Qi |
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| Institution: | (State Key Laboratory of Polymer Materials Engineering,Sichuan University,Chengdu 610065,China) |
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| Abstract: | Solution crystallization of polyoxymethylene(POM)/poly(ethylene oxide)(PEO)(50/50) blend with different molecular weight(n of PEO,using hexafluoroisopropanol(HFIP) as common solvent,was studied by differential scanning calorimeter(DSC),scanning electron spectroscopy(SEM) and infrared spectra(IR).It indicated that the lower n of PEO,the stronger interruption between POM and PEO in the crystallization.When n of PEO was 4×103,POM formed partial imperfect crystals,thus showing obvious double melting peaks in the blend.SEM results showed that no obvious phase separation occurred in the POM/PEO blend with different n of PEO and it was easier for the blend with lower n of PEO to form regular spherulites.It was expected that the interpenetrated structure was formed in the POM/PEO 50/50 blend through solution crystallization. |
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| Keywords: | Polyoxymethylene Poly(ethylene oxide) Solution crystallization |
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