Oriented crystallization process of polypropylene fractions
文献类型：期刊论文
| 作者 | Shi HW ; Yang DC |
| 刊名 | chemical journal of chinese universities-chinese
 |
| 出版日期 | 2002 |
| 卷号 | 23期号:1页码:152-154 |
| 关键词 | SUPERMOLECULAR STRUCTURE ISOTACTIC POLYPROPYLENE MOLECULAR-WEIGHT |
| ISSN号 | 0251-0790 |
| 通讯作者 | yang dc |
| 中文摘要 | melting recrystallization processes of melt-sheared films of polypropylene (s28c) fractions have been investigated in situ by polarized optical microscope equipped with ccd camera and hot-stage. actually, the morphological developments in the melting recrystallization are partially reappearance of oriented crystallization processes during melt-shearing the fractions, which is due to a memory effect of oriented structure of polymer. for low molecular weight fraction, only incomplete spherulites with some orientation along shear direction are observed in the melting recrystallization processes of the sheared films. for middle molecular weight fractions, extended chain fiber crystals(or bands) are formed first at higher temperatures, and the bands can act as self-nuclei (i. e., row nuclei), resulting in epitaxial growth of chain-folded lamellae(or fibril), i. e., the formation of cylindrites, with further decrease of the crystallization temperature. for high molecular weight fraction, however, it is not possible to shear the melt film because of its high melt viscosity. when the low molecular weight fraction in which no fiber crystals or cylindrites are observed, are mixed with small amount(about 1%-2%) of the high molecular weight fraction, quite large number of cylindrites are formed during the melting recrystallization process of its sheared film, which implies that the component of high molecular weight plays an important role in the formation of cylindrites during the shear process of polypropylene. |
| 收录类别 | SCI收录期刊论文 |
| 语种 | 中文 |
| WOS记录号 | WOS:000173834700040 |
| 公开日期 | 2010-11-03 |
| 源URL | [http://202.98.16.49/handle/322003/18797]  |
| 专题 | 长春应用化学研究所_长春应用化学研究所知识产出_期刊论文 |
| 推荐引用方式 GB/T 7714 | Shi HW,Yang DC. Oriented crystallization process of polypropylene fractions[J]. chemical journal of chinese universities-chinese,2002,23(1):152-154. |
| APA | Shi HW,&Yang DC.(2002).Oriented crystallization process of polypropylene fractions.chemical journal of chinese universities-chinese,23(1),152-154. |
| MLA | Shi HW,et al."Oriented crystallization process of polypropylene fractions".chemical journal of chinese universities-chinese 23.1(2002):152-154. |
入库方式： OAI收割
来源：长春应用化学研究所
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