Formation of crystal-like structure and effective hard domain in a thermoplastic polyurethane
文献类型：期刊论文
| 作者 | Kong, Zhengyang; Ying, Wu Bin; Hu, Han; Wang, Kai; Chen, Chao; Tian, Ying; Li, Fenglong; Zhang, Ruoyu |
| 刊名 | POLYMER
 |
| 出版日期 | 2020 |
| 卷号 | 210 |
| 关键词 | POLYMER CRYSTALLIZATION RHEOLOGICAL PROPERTIES MICROPHASE SEPARATION BLOCK-COPOLYMERS PHASE-SEPARATION SEGMENT LENGTH KINETICS MELTS INCOMPATIBILITY ORGANIZATION |
| 英文摘要 | Traditionally, the hard domain of polyurethane was considered as the physical crosslinking point and has been studied for several decades. However, due to the hierarchical and metastable nature of the hard phase, its delicate structure hasn't been resolved thoroughly and its formation mechanism was unclear too. In this work, crystal-like structure in an amorphous polyurethane was discovered by conventional DSC experiments, and Flash DSC was used to study the thermodynamics and kinetics of such crystal-like structure by one-step and two-step temperature annealing experiment. It was found that the formation of crystal-like structure included nucleation and growth. However, its equilibrium melting point couldn't be obtained by Hoffman-Weeks' method and its structural regularity was weaker than the crystal. Moreover, the nucleus had more compact structure than its outer layer and owned higher melting point. With the help of time dependent FTIR experiment, we proved that the hard domain formed much earlier than the crystal-like structure. Such result implied that the crystal-like structure was birthed inside the hard domain and its core was the reorganized hard segments, which acted as nucleus. After that, the reorganization of outer layer began, and was the growth process of crystal-like structure. Furthermore, time dependent oscillatory rheological experiment proved that the physical network in polyurethane formed much later than the formation of crystal-like structure, which meant the growth of hard domain was slow. In conclusion, the formation of effective hard domain, which could act as physical crosslinking point, experiences hydrogen bonding association, crystal-like structure formation and size expansion processes. |
| 源URL | [http://ir.nimte.ac.cn/handle/174433/22419]  |
| 专题 | 中国科学院宁波材料技术与工程研究所 2020专题_期刊论文 2021专题_期刊论文 |
| 作者单位 | Zhang, RY (corresponding author), Chinese Acad Sci, Ningbo Inst Mat Technol & Engn, Key Lab Biobased Polymer Mat Technol & Applicat Z, Ningbo 315201, Zhejiang, Peoples R China. |
| 推荐引用方式 GB/T 7714 | Kong, Zhengyang,Ying, Wu Bin,Hu, Han,et al. Formation of crystal-like structure and effective hard domain in a thermoplastic polyurethane[J]. POLYMER,2020,210. |
| APA | Kong, Zhengyang.,Ying, Wu Bin.,Hu, Han.,Wang, Kai.,Chen, Chao.,...&Zhang, Ruoyu.(2020).Formation of crystal-like structure and effective hard domain in a thermoplastic polyurethane.POLYMER,210. |
| MLA | Kong, Zhengyang,et al."Formation of crystal-like structure and effective hard domain in a thermoplastic polyurethane".POLYMER 210(2020). |
入库方式： OAI收割
来源：宁波材料技术与工程研究所
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