| 剪切速率对等规聚丙烯的结晶和形貌的影响 |
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| 引用本文： | 唐毓婧,门永锋. 剪切速率对等规聚丙烯的结晶和形貌的影响[J]. 高等学校化学学报, 2016, 37(2): 367-372. DOI: 10.7503/cjcu20150675 |
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| 作者姓名： | 唐毓婧 门永锋 |
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| 作者单位： | 1. 中国科学院长春应用化学研究所, 高分子物理与化学国家重点实验室, 长春 1300222. 中国石油化工股份有限公司北京化工研究院, 北京 100013 |
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| 摘 要： | 利用同步辐射小角X射线散射、 广角X射线衍射和差示扫描量热法研究了不同剪切速率下等规聚丙烯的结晶结构. 结果表明, 施加剪切会导致β晶生成, 但基本不改变样品总结晶度. β晶含量随着剪切速率的提高先升高后降低, 与α晶具有竞争关系. 当剪切速率在10~32 s-1之间时, α晶和β晶共存, 并存在分属于两种晶型的两组长周期, 其中较大的长周期属于β晶.
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| 关 键 词： | 等规聚丙烯 剪切速率 同步辐射小角X射线散射 |
| 收稿时间： | 2015-08-27 |
Influence of Shear on i-Polypropylene Crystallization and Morphology† |
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| TANG Yujing,MEN Yongfeng. Influence of Shear on i-Polypropylene Crystallization and Morphology†[J]. Chemical Research In Chinese Universities, 2016, 37(2): 367-372. DOI: 10.7503/cjcu20150675 |
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| Authors: | TANG Yujing MEN Yongfeng |
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| Affiliation: | 1. State Key laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Science, Changchun 130022, China2. SINOPEC Beijing Research Institute of Chemical Industry, Beijing 100013, China |
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| Abstract: | The shear-induced crystallization behavior of isotactic polypropylene ( iPP) was investigated by synchrotron small angle X-ray scattering, wide angle X-ray diffraction and differential scanning calorimetry. The results showed that the β-crystallinity were found after shearing and the total crystallnity kept almost constant. The β-crystallinity increased with the shear rate up to 10 s-1 and then decreased at higher shear rates indicating the existence of competing processes of developing α- and β-crystallinities. At the shear rates between 10 s-1 and 32 s-1 , two populations of long spacing were observed with the larger one attributed to theβ-crystallinity. |
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| Keywords: | Isotactic polypropylene Shear tate Synchrotron small angle X-ray scattering |
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