摘要
用DSC研究了尼龙 12 12 ,尼龙 6及其共混体系的非等温结晶行为 .结果表明 ,加工历史对尼龙的结晶和熔融行为影响很大 .经双螺杆挤出机挤出的尼龙 12 12和尼龙 6 ,由于应力诱导分子链取向 ,其结晶温度都有不同程度的提高 ,且表现出多重熔融现象 .在共混体系中 ,尼龙 12 12分子在共混物的界面上异相成核结晶 ,提高了其结晶温度 ,但酸酐化SEBS的加入抑制了分子链的运动又使其结晶温度降低 .共混体系降低了尼龙12 12的熔融温度 ,并使得其高熔点的熔融峰逐渐消失 ;而尼龙 6的熔融行为基本上没有变化 .
Nonisothermal crystallization behavior of nylon 6, nylon 1212 and their blends using maleated SEBS as compatibilizers were studied by differential. scanning calorimetry (DSC). The results showed that the processing history had a great influence on the crystallization and melt behavior of nylons. The extruded nylons showed improved crystallization temperature (T-c) and multiple melting phenomena due to the stress induced molecular orientation. In blends, the heterogeneous crystallization of nylon 1212 on the interface of nylon 1212 and nylon 6 occurred. Therefore, the T-c of nylon 1212 was increased. With the addition of maleated SEBS, the formation of grafted copolymers between nylon 1212 and maleated SEBS restrained the movement of molecules and decreased the T-c of nylon 1212. The melt temperature (T-m) of nylon 1212 was declined and the upper melting peak disappeared with increase of maleated SEBS in blends. However, the melt behavior of nylon 6 in blends was nearly unchanged.
出处
《高分子学报》
SCIE
CAS
CSCD
北大核心
2005年第2期227-230,共4页
Acta Polymerica Sinica
