链缠结对高聚物热转变行为的影响  

THE EFFECT OF CHAIN ENTANGLEMENTS ON HEAT TRANSITION \=BEHAVIORS OF POLYMERS

作　　者：陈民[1] 顾方明[1] 卜海山[1] 

机构地区：[1]复旦大学材料科学系

出　　处：《高分子学报》1999年第3期332-337,共6页Acta Polymerica Sinica

摘　　要：用冷冻升华方法，由等规聚苯乙烯、聚环氧乙烷的稀溶液制备单链、寡链附聚粒子．附聚粒子的热分析表明，冷结晶温度降低、结晶速度加快、晶体增厚明显．这些结果是因为附聚粒子没有或有很少链间缠结．附聚粒子形成较小尺寸的晶体，因而熔点较低，相应的热结晶温度移向低温．在平衡熔点以上放置短时间，链相互贯穿、缠结，又回复到本体的熔融。Collective single\| and few\| chain particles of isotactic polystyrene and poly\|(ethylene oxide) were obtained by a freeze\|drying procedure from dilute solutions.Thermal analysis of the collective particles revealed that cold crystallization temperature depresses,crystallization rate increases and crystal thickening is more evident.These observations can be attributed to none or much fewer entaglements between and within particles.Collective particles crystallized to form small crystals,thus leading to a lower melting temperature.On heating collective particles above equilibrum melting point for a short period of time,interpenetration and entanglement occurred and the crystallization and melting behavior characterized by bulk polymer was recovered.\=

关 键 词：聚苯乙烯 聚环氧乙烷 结晶 熔融 链缠结 热转变行为 

分 类 号：O631.1[理学—高分子化学]