Crystalline structure of injection molded β-isotactic polypropylene: Analysis of the oriented shear zone
Liu X, Dai K, Hao X, Zheng G, Liu C, Schubert DW, Shen C (2013)
Publication Language: English
Publication Status: Published
Publication Type: Journal article, Original article
Publication year: 2013
Journal
Book Volume: 52
Pages Range: 11996-12002
Journal Issue: 34
URI: https://pubs.acs.org/doi/10.1021/ie401162c
DOI: 10.1021/ie401162c
Abstract
Although both shear flow and β-nucleating agent (β-NA) could separately induce β-crystal in isotactic polypropylene (iPP), their combination, particularly in the typical industrial processes, in fact has received comparatively little attention. In the current study, two-dimensional wide-angle X-ray diffraction and small-angle X-ray scattering (2D-WAXD/SAXS) measurements were performed to investigate the effect of β-NA on the crystalline structure of the oriented shear zone in injection molded iPP. It is observed that, regardless of the β-NA concentration, parent–daughter structure of α-crystal can be formed in iPP. Furthermore, the fraction of daughter lamellae elevates with the increasing concentration of β-NA. Interestingly, unexpected scattering patterns of (300) reflection for β-crystal, which is similar with that for parent–daughter lamellar branching of α-crystal, is exclusively found in iPP with higher concentration of β-NA (1.0 wt %). The most possible explanation is that the addition of high content of β-NA lowers the free energy barrier. Additionally, the same change tendency of long period, crystal lamellar thickness and lateral dimension, d-spacing and crystallite size is found, viz., they first increase and then decrease with the increasing β-NA content. The results demonstrate that the concentrations of β-NA have a significant effect on the crystal grain structure under the practical molding process.
Authors with CRIS profile
Xiaoqiong Hao
Lehrstuhl für Werkstoffwissenschaften (Polymerwerkstoffe)
Dirk Schubert
Lehrstuhl für Werkstoffwissenschaften (Polymerwerkstoffe)
Involved external institutions
China (CN)How to cite
APA:
Liu, X., Dai, K., Hao, X., Zheng, G., Liu, C., Schubert, D.W., & Shen, C. (2013). Crystalline structure of injection molded β-isotactic polypropylene: Analysis of the oriented shear zone. Industrial & Engineering Chemistry Research, 52(34), 11996-12002. https://doi.org/10.1021/ie401162c
MLA:
Liu, Xianhu, et al. "Crystalline structure of injection molded β-isotactic polypropylene: Analysis of the oriented shear zone." Industrial & Engineering Chemistry Research 52.34 (2013): 11996-12002.
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