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Investigation of deformation and pore formation in isotactic polypropylene containing active nano-CaCO 3

2017; Wiley; Volume: 66; Issue: 11 Linguagem: Inglês

10.1002/pi.5405

1097-0126

Lei Ding, Tong Wu, Qian Ge, Guan Xu, Feng Yang, Ming Xiang,

biodegradable polymer synthesis and properties

Polymer InternationalVolume 66, Issue 11 p. 1498-1509 Research Article Investigation of deformation and pore formation in isotactic polypropylene containing active nano-CaCO3 Lei Ding, Lei Ding State Key Laboratory of Polymer Materials Engineering, Polymer Research Institute of Sichuan University, Chengdu, People's Republic of ChinaSearch for more papers by this authorTong Wu, Tong Wu State Key Laboratory of Polymer Materials Engineering, Polymer Research Institute of Sichuan University, Chengdu, People's Republic of ChinaSearch for more papers by this authorQian Ge, Qian Ge State Key Laboratory of Polymer Materials Engineering, Polymer Research Institute of Sichuan University, Chengdu, People's Republic of ChinaSearch for more papers by this authorGuan Xu, Guan Xu State Key Laboratory of Polymer Materials Engineering, Polymer Research Institute of Sichuan University, Chengdu, People's Republic of ChinaSearch for more papers by this authorFeng Yang, Corresponding Author Feng Yang yangfengscu@126.com State Key Laboratory of Polymer Materials Engineering, Polymer Research Institute of Sichuan University, Chengdu, People's Republic of ChinaCorrespondence to: F Yang, State Key Laboratory of Polymer Materials Engineering, Polymer Research Institute of Sichuan University, Chengdu, People's Republic of China. E-mail: yangfengscu@126.comSearch for more papers by this authorMing Xiang, Ming Xiang State Key Laboratory of Polymer Materials Engineering, Polymer Research Institute of Sichuan University, Chengdu, People's Republic of ChinaSearch for more papers by this author Lei Ding, Lei Ding State Key Laboratory of Polymer Materials Engineering, Polymer Research Institute of Sichuan University, Chengdu, People's Republic of ChinaSearch for more papers by this authorTong Wu, Tong Wu State Key Laboratory of Polymer Materials Engineering, Polymer Research Institute of Sichuan University, Chengdu, People's Republic of ChinaSearch for more papers by this authorQian Ge, Qian Ge State Key Laboratory of Polymer Materials Engineering, Polymer Research Institute of Sichuan University, Chengdu, People's Republic of ChinaSearch for more papers by this authorGuan Xu, Guan Xu State Key Laboratory of Polymer Materials Engineering, Polymer Research Institute of Sichuan University, Chengdu, People's Republic of ChinaSearch for more papers by this authorFeng Yang, Corresponding Author Feng Yang yangfengscu@126.com State Key Laboratory of Polymer Materials Engineering, Polymer Research Institute of Sichuan University, Chengdu, People's Republic of ChinaCorrespondence to: F Yang, State Key Laboratory of Polymer Materials Engineering, Polymer Research Institute of Sichuan University, Chengdu, People's Republic of China. E-mail: yangfengscu@126.comSearch for more papers by this authorMing Xiang, Ming Xiang State Key Laboratory of Polymer Materials Engineering, Polymer Research Institute of Sichuan University, Chengdu, People's Republic of ChinaSearch for more papers by this author First published: 19 May 2017 https://doi.org/10.1002/pi.5405Citations: 5Read the full textAboutPDF ToolsRequest permissionExport citationAdd to favoritesTrack citation ShareShare Give accessShare full text accessShare full-text accessPlease review our Terms and Conditions of Use and check box below to share full-text version of article.I have read and accept the Wiley Online Library Terms and Conditions of UseShareable LinkUse the link below to share a full-text version of this article with your friends and colleagues. Learn more.Copy URL Share a linkShare onFacebookTwitterLinkedInRedditWechat Abstract In order to improve the β-lamellae distribution and properties of β-isotactic polypropylene (β-iPP) membranes, amounts of 5 and 10% active nano-CaCO3 were added into β-iPP. Differential scanning calorimetry, X-ray diffraction and scanning electron microscopy results show that nano-CaCO3 does not reduce the content of β-crystals, but the thickness, lamellae thickness distribution and stability of β-lamellae decrease apparently. Tensile testing was conducted at 25 and 90 °C. The results manifest that the second yield point, which has a strong negative correlation with lamellae thickness distribution, is delayed monotonically with addition of nano-CaCO3 when stretched at 25 °C, indicating that nano-CaCO3 could narrow effectively the lamellae thickness distribution of β-iPP. Furthermore, when stretched at 90 °C, the subdued yield peak, retarded necking-down phenomenon and enhanced strain-hardening modulus demonstrate that the deformation stability improves gradually with introduction of nano-CaCO3, which is completely opposite to the trend for β-lamellae stability. Through further detailed characterization of morphological evolutions during stretching, we found that interfacial debonding between nano-CaCO3 and β-iPP is triggered and abundant microviods can be formed, which can retard the rotation and slip of β-lamellae and make the β–α transformation slow down in the initial stage of stretching, consequently leading to better isotropic deformation. Moreover, nano-CaCO3 could efficiently restrain the formation of coarse fibrils, leading to more uniform pore size distribution within the biaxial stretching microporous membrane. However, excessive nano-CaCO3 (10%) would cause aggregation within the β-iPP cast film and finally result in larger pores and poor pore distribution in the membrane. © 2017 Society of Chemical Industry Citing Literature Volume66, Issue11November 2017Pages 1498-1509 RelatedInformation