【作者】 亢健； 杨锋； 陈金耀； 曹亚； 向明；

【Author】 KANG Jian;YANG Feng;CHEN Jinyao;CAO Ya;XIANG Ming;Polymer Research Institute of Sichuan University,State Key Laboratory of Polymer Science Engineering;

【机构】 四川大学高分子研究所,高分子材料工程国家重点实验室；

【摘要】 <正>近期研究表明,在聚合物结晶过程中,当分子链从完全无序的无定形态发展到高度有序晶态的过程中,可能存在"局部有序"的过渡态,称为熔体有序结构^[1]。然而,由于表征技术有限,一般难以精确表征结晶初期的熔体状态变化。而有序结晶初期通过调控加热温度来调节聚合物熔体的有序程度,进而研究其在结晶初期中的作用是一种行之有效的方法^[2]。已经发现,一般情况下,聚丙烯的熔体有序结构都无法、甚至会抑制β结晶。只有具有一定"取向状态"更多还原

【Abstract】 Aiming at exploring the role of ordered structures in the β-phase crystallization of nucleated isotactic polypropylene,the β-iPP nucleated with 0.03%dual selective β-nucleating agents was prepared,and the fusion temperature was tuned to create P-iPP with different melt structures.Surprisingly,it was found that under the influence of β-NA,the ordered structures exhibited highβ-nucleation efficiency,resulting in evident increase of β-crystallization.The structure evolution ofβ-iPP with different melt structures was explored by PLOM,in-situ SAXS and DSC.The related mechanism was also proposed.更多还原