Enhanced melt-recrystallization process of propylene-ethylene copolymer during the uniaxial stretching with the aid of isotactic polypropylene

Polymer ◽  
2021 ◽  
pp. 124443
Author(s):  
Feng-Yang Wu ◽  
Sheng Yang ◽  
Hao Lin ◽  
Jun Lei ◽  
Ling Xu ◽  
...  
Keyword(s):  
Isotactic Polypropylene ◽  
Recrystallization Process ◽  
Uniaxial Stretching ◽  
Ethylene Copolymer

Study on variable nucleation efficiency of N,N ′-Dicyclohexyl-2,6-naphthalenedicarboxamide on isotactic polypropylene

2016 ◽  
Vol 29 (12) ◽  
pp. 1667-1679 ◽  
Author(s):  
Yaoqi Shi ◽  
Zhong Xin
Keyword(s):  
Optical Microscopy ◽  
Isotactic Polypropylene ◽  
Nucleating Agent ◽  
Recrystallization Process ◽  
Schematic Diagram ◽  
Microscopy Observation ◽  
Crystallization Peak ◽  
Nucleation Behavior ◽  
Polarized Optical Microscopy ◽  
Whole Process

N, N′-Dicyclohexyl-2,6-naphthalenedicarboxamide (NU100), a commercial β-nucleating agent (NA) for isotactic polypropylene (iPP), is found dissolvable in iPP melt. Various heating temperatures ( Ths) of iPP/NU100 cause different solubilities of NA, resulting in various aggregation morphologies of NU100 in the melt. Moreover, nucleation efficiency of NA NU100 on iPP changes with the Th of iPP/NU100. In this article, the effects of Th on nucleation behaviors of iPP nucleated with different concentrations of NU100 were systematically studied. The results indicated nucleation efficiency of NU100 depended not only on concentration of NA but also on Th of nucleated iPP. With the increase of Th, crystallization peak temperature ( Tcp) of nucleated iPP decreased remarkably. The whole process that Tcp shifted from 126.8°C to 120.8°C was obtained by investigating the nucleation behavior of iPP/0.1 wt% NU100. Polarized optical microscopy observation confirmed lower Tcp, representing the crystallization of iPP nucleated by dissolved–recrystallized NA NU100. Further, diverse aggregation morphologies of NA in iPP melt during crystallization were observed. A schematic diagram was proposed illustrating the morphologies formed during recrystallization process of NU100 melted at different Ths.

Morphology and thermal properties in the binary blends of poly(propylene-co-ethylene) copolymer and isotactic polypropylene with polyethylene

Polymer ◽  
2007 ◽  
Vol 48 (10) ◽  
pp. 2946-2957 ◽  
Author(s):  
Jean-Hong Chen ◽  
Jin-Cai Zhong ◽  
Yi-Hang Cai ◽  
Wen-Bin Su ◽  
Yao-Bin Yang
Keyword(s):  
Thermal Properties ◽  
Isotactic Polypropylene ◽  
Binary Blends ◽  
Ethylene Copolymer ◽  
Poly Propylene

Deformation-induced morphology evolution during uniaxial stretching of isotactic polypropylene: effect of temperature

2011 ◽  
Vol 290 (3) ◽  
pp. 261-274 ◽  
Author(s):  
Ruiying Bao ◽  
Zhitian Ding ◽  
Ganji Zhong ◽  
Wei Yang ◽  
Banghu Xie ◽  
...  
Keyword(s):  
Isotactic Polypropylene ◽  
Effect Of Temperature ◽  
Morphology Evolution ◽  
Uniaxial Stretching
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