MDI INDUCED CRYSTALLIZATION OF THERMOPLASTIC POLYURETHANE VIA MELT COMPOUNDING
Thermoplastic polyurethanes (TPUs) are linear block copolymers, composed of multiple hard segments and soft segments. The structure and morphology of the hard segment domain in segmented polyurethanes has been the hot topic of considerable research in the past, while spherulitic superstructure has been occasionally observed for the crystalline hard segment materials 1-3. It is generally believed 4 that the hard segments need high level of mobility present either during solution casting, due to the solvent, or during polymerization, due to the monomer molecules, in order to form spherulites. Xu 5 found that TPU can form spherulites upon quenching the melt to an annealing temperature. In the present work, a very small amount of 4, 4-diphenylmethane diisocyanate (MDI) was introduced during melt compounding to investigate the morphology change of TPU.
Wanli Li Jinli Liu Yong Zhou Lei Kong Ying Zhao Dujin Wang
Beijing National Laboratory for Molecular Sciences,Key Laboratory of Engineering Plastics,Institute POL Research Institute of General Logistics Department,Beijing 102300 Beijing National Laboratory for Molecular Sciences,Key Laboratory of Engineering Plastics,Institute
国际会议
International Symposium on Polymer Physics(2008年国际高分子物理学术会议PP2008)
厦门
英文
125-126
2008-06-08（万方平台首次上网日期，不代表论文的发表时间）