scholarly journals Melting and Crystallization of Ultra-High Molecular Weight Polyethylene with Appearance of Hexagonal Phase II. Strain-Induced Crystallization of Thermal-Contracted Sample

1996 ◽  
Vol 28 (7) ◽  
pp. 563-567 ◽  
Author(s):  
Shinsuke Tsubakihara ◽  
Munehisa Yasuniwa
Keyword(s):  
Molecular Weight ◽  
High Molecular Weight ◽  
Phase Ii ◽  
Hexagonal Phase ◽  
Strain Induced Crystallization ◽  
Ultra High Molecular Weight ◽  
Induced Crystallization ◽  
Melting And Crystallization

scholarly journals Melting and Crystallization of Solution Crystallized Ultra-High Molecular Weight Polyethylene under High Pressure

1990 ◽  
Vol 22 (5) ◽  
pp. 411-415 ◽  
Author(s):  
Munehisa Yasuniwa ◽  
Masashi Yamaguchi ◽  
Atsushi Nakamura ◽  
Shinsuke Tsubakihara
Keyword(s):  
Molecular Weight ◽  
High Pressure ◽  
High Molecular Weight ◽  
Ultra High Molecular Weight ◽  
Melting And Crystallization

scholarly journals Effect of Ultra-High-Molecular-Weight Molecular Chains on the Morphology, Crystallization, and Mechanical Properties of Polypropylene

Polymers ◽  
2021 ◽  
Vol 13 (23) ◽  
pp. 4222
Author(s):  
Takumitsu Kida ◽  
Takeyoshi Kimura ◽  
Ayaka Eno ◽  
Khunanya Janchai ◽  
Masayuki Yamaguchi ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Molecular Weight ◽  
High Molecular Weight ◽  
Crystallization Process ◽  
Tensile Deformation ◽  
Measurement Techniques ◽  
Extruded Films ◽  
Melt Elasticity ◽  
Ultra High Molecular Weight ◽  
Induced Crystallization

The effects of the ultra-high-molecular-weight (UHMW) component of polypropylene (PP) on its rheological properties, crystallization behavior, and solid-state mechanical properties were investigated using various measurement techniques. The terminal relaxation time—determined by measuring the linear viscoelasticity—was increased by adding the UHMW component. The increase in the melt elasticity produced by adding the UHMW component was observed by measuring the steady-state shear flow, although the shear viscosity was not greatly affected. Owing to the long characteristic time of the Rouse relaxation of the UHMW component, PP with the UHMW component formed highly oriented structures through a shear-induced crystallization process. The addition of the UHMW component enhanced the orientation and regularity of crystalline structure for extruded films. Therefore, the Young’s modulus, yield stress, and strength were higher in the PP film containing the UHMW component than in one without the UHMW component, irrespective of the direction of tensile deformation.

Shear-induced crystallization in isotactic polypropylene containing ultra-high molecular weight polyethylene oriented precursor domains

Polymer ◽  
2005 ◽  
Vol 46 (9) ◽  
pp. 3096-3104 ◽  
Author(s):  
Daniel Dikovsky ◽  
Gad Marom ◽  
Carlos A. Avila-Orta ◽  
Rajesh H. Somani ◽  
Benjamin S. Hsiao
Keyword(s):  
Molecular Weight ◽  
High Molecular Weight ◽  
Isotactic Polypropylene ◽  
Ultra High Molecular Weight ◽  
Induced Crystallization

Melting and crystallization of ultra-high-molecular-weight polyethylene in a mixture with tetracontane under high pressure

Polymer ◽  
1991 ◽  
Vol 32 (4) ◽  
pp. 696-702 ◽  
Author(s):  
Chitoshi Nakafuku ◽  
Hitoshi Nakagawa ◽  
Munehisa Yasuniwa ◽  
Shinsuke Tsubakihara
Keyword(s):  
Molecular Weight ◽  
High Pressure ◽  
High Molecular Weight ◽  
Ultra High Molecular Weight ◽  
Melting And Crystallization
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