Conformational Ordering on the Growth Front of Isotactic Polypropylene Spherulite
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- 作者：Yuanhua Cong ; Zhihua Hong ; Weiming Zhou ; Wei Chen ; Fengmei Su ; Hailong ; Li ; Xiangyang Li ; Ke Yang ; Xiaohan Yu ; Zeming Qi ; Liangbin Li
- 刊名：Macromolecules
- 出版年：2012
- 出版时间：November 13, 2012
- 年：2012
- 卷：45
- 期：21
- 页码：8674-8680
- 全文大小：405K
- 年卷期：v.45,no.21(November 13, 2012)
- ISSN：1520-5835
文摘
The growth front of isotactic polypropylene (iPP) spherulites is studied with series of in-situ microanalyzing techniques: conventional source infrared microspectroscopic (CS-渭IR), polarized infrared microspectroscopic imaging (SR-渭PIR), and scanning X-ray microdiffraction (SR-渭SXRD). By SR-渭SXRD, the actual growth front boundary of spherulite was clearly defined, which is the boundary observed with an optical microscope. Measurements of CS-渭IR and SR-渭PIR on growing spherulites reveal that a growth front layer (GFL) with high content of conformational ordered long helices exists outside the growth front of spheurlite, which has a thickness up to 30 渭m above 142 掳C. These long helices preferentially orient perpendicular to the radial direction of spherulite, whose growth fashion seems correlating with the growth of spherulite.