Unusual hierarchical structures of mini-injection molded isotactic polypropylene/ultrahigh molecular weight polyethylene blends

2013 ◽  
Vol 49 (2) ◽  
pp. 538-548 ◽  
Author(s):  
Yuan An ◽  
Rui-Ying Bao ◽  
Zheng-Ying Liu ◽  
Xiao-Jun Wu ◽  
Wei Yang ◽  
...  
Keyword(s):  
Molecular Weight ◽  
Isotactic Polypropylene ◽  
Hierarchical Structures ◽  
Ultrahigh Molecular Weight Polyethylene ◽  
Polyethylene Blends ◽  
Ultrahigh Molecular Weight ◽  
Injection Molded

Rheological investigation of creep recovery for UHMWPE or carbon nanotubes in isotactic polypropylene matrix

e-Polymers ◽  
2016 ◽  
Vol 16 (2) ◽  
pp. 145-150 ◽  
Author(s):  
Zhaohua Xu ◽  
Heng Li ◽  
Ning Sun
Keyword(s):  
Carbon Nanotubes ◽  
Isotactic Polypropylene ◽  
Elastic Recovery ◽  
Ultrahigh Molecular Weight Polyethylene ◽  
Creep Recovery ◽  
Polyethylene Blends ◽  
Rheological Measurements ◽  
Ultrahigh Molecular Weight ◽  
Polypropylene Matrix ◽  
Percolation Thresholds

AbstractIsotactic polypropylene/ultrahigh-molecular-weight polyethylene blends (iPP/UHMWPE) and iPP/carbon nanotubes composites (iPP/CNTs) were prepared by a coagulation method followed by compression molding. The percolation thresholds for melts of iPP/UHMWPE blends and iPP/CNTs composites determined by rheometer, were beyond 5.0 wt% and close to 4.0 wt%, respectively. The creep and creep-recovery behavior of iPP/UHMWPE and iPP/CNTs melts were systematically investigated by rheological measurements. The results indicated that UHMWPE and CNTs played similar roles in the material’s elastic recovery, the addition of 2.0 wt% UHMWPE or 0.2 wt% CNTs increased the elastic recovery about 10 fold in comparison with neat iPP.

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