文献类型：期刊文献

英文题名：The Phase Transition Behavior of Pb in Partial Melting PB/PP

作者：Zhu, Enci[1]; Hao, Ruosong[3]; Liu, Zhipeng[1]; Shi, Weixuan[1]; Wu, Tong[1,2]; Zhao, Shicheng[1]

机构：[1] Shanghai Key Laboratory of Multiphase Materials Chemical Engineering, State-Key Laboratory of Chemical Engineering, East China University of Science and Technology, Shanghai, 200237, China; [2] SINOPEC Ningbo New Materials Research Institute Company Limited, Ningbo, China; [3] Northwestern Polytechnical University, Xi’an, 710072, China

年份：2024

外文期刊名：SSRN

收录：EI(收录号：20240253580)

语种：英文

外文关键词：Crystals - Melting

摘要：Polybutene (PB) is a typical polymer with various crystal forms: I, II, III and I’. Among them, Form I and Form II crystal are most common forms and the mechanical properties of Form I PB is better. However, only Form II crystal can be obtained from the melt due to the kinetic advantage and then it will transform to Form I slowly. And the slow phase transition from Form II to I restricts the application. Partial melting can accelerate the phase transition and the phase transition behavior was studied by Flash DSC. The results indicated that the phase transition behavior during partial melting shows dependence on the isothermal crystallization temperature and 70 °C is optimal. Phase transition during partial melting can reduce the phase transition time from 20 h to 200 s. As the crystallization temperature determined, stepwise crystallization, dividing the crystallization process into nucleating and growth, was applied to accelerate the phase transition. The influence of nucleating temperature and time on the phase transition was investigated and the results indicated that 0 °C and 2 s are the best temperature and time respectively. With stepwise crystallization, the phase transition time was further reduced to 50 s. Moreover, stepwise crystallization can also increase the content of Form I crystal from 80.0% to 98.2%. The mechanism of phase transition during partial melting was proposed according to the results, which can supplement the existing phase transition mechanism. ? 2024, The Authors. All rights reserved.