Spherulite formation of hard segments and compatibility between soft and hard segments in polyurethanes
文献类型：期刊论文
| 作者 | Ma, JW; Ma, DZ; Li, YJ; Xu, M |
| 刊名 | ACTA POLYMERICA SINICA
 |
| 出版日期 | 2000-08-01 |
| 期号 | 4页码:426-431 |
| 关键词 | Polyurethane Soft Segment Hard Segment Compatibility Growth Of Spherulite |
| ISSN号 | 1000-3304 |
| 英文摘要 | The spherulite growth of hard segments in polyurethanes and its relation to the compatibility between the soft and hard segments were studied. DMA and DSC measurements indicate that polyurethane with different soft segments(PCL,PTAM, PTMO and PPO) exhibit different compatibility between their soft and hard segments. The compatibility between hard and soft segmeats in polyurethanes decreases in a sequence of PCL,PTMA, PTMO and PPO. The temperature range for hard segments of polyurethane to grow spherulites in annealing from melt is limited. The better the compatibility between the soft and hard segments, the narrower the temperature range for spherulite formation and the longer the crystallization time. The low temperature limit of spherulite growth is 120 degrees C for polyurethane with MDI-BDO hard segments and does not change with soft segments. This limit is determined by the hydrogen bonds between the hard segments and soft segments. The high temperature limit of spherulite growth strongly depends on the compatibility between the soft and hard segments. The worse the compatibility, the higher the high temperature limit. Only when the temperature becomes high enough,the compatibility between the soft and hard segments can prevent the forming of spherulite. When the hard segments crystallize from melt, there exist a most appropriate temperature of forming spherulites,at which the amount of hydrogen bonds has a maximum as shown by FTIR. In such cases the crystallites and spherulites are more stable. |
| 语种 | 英语 |
| WOS记录号 | WOS:000089003100008 |
| 出版者 | SCIENCE PRESS |
| 源URL | [http://ir.iccas.ac.cn/handle/121111/76029]  |
| 专题 | 中国科学院化学研究所 |
| 通讯作者 | Ma, JW |
| 作者单位 | 1.Univ Sci & Technol China, Dept Polymer Sci & Engn, Hefei 230026, Peoples R China 2.Chinese Acad Sci, Inst Chem, Polymer Phys Lab, Beijing 100080, Peoples R China |
| 推荐引用方式 GB/T 7714 | Ma, JW,Ma, DZ,Li, YJ,et al. Spherulite formation of hard segments and compatibility between soft and hard segments in polyurethanes[J]. ACTA POLYMERICA SINICA,2000(4):426-431. |
| APA | Ma, JW,Ma, DZ,Li, YJ,&Xu, M.(2000).Spherulite formation of hard segments and compatibility between soft and hard segments in polyurethanes.ACTA POLYMERICA SINICA(4),426-431. |
| MLA | Ma, JW,et al."Spherulite formation of hard segments and compatibility between soft and hard segments in polyurethanes".ACTA POLYMERICA SINICA .4(2000):426-431. |
入库方式： OAI收割
来源：化学研究所
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