Influence of high molecular weight component on the hierarchical crystalline structures of injection-molded bars of polyethylene

2013 ◽  
Vol 63 (8) ◽  
pp. 1513-1522 ◽  
Author(s):  
Long Wang ◽  
Ming-Bo Yang
Keyword(s):  
Molecular Weight ◽  
High Molecular Weight ◽  
Crystalline Structures ◽  
High Molecular Weight Component ◽  
Injection Molded

scholarly journals The Effect of Stereocomplex Polylactide Particles on the Stereocomplexation of High Molecular Weight Polylactide Blends

Polymers ◽  
2021 ◽  
Vol 13 (12) ◽  
pp. 2018
Author(s):  
Muhammad Samsuri ◽  
Ihsan Iswaldi ◽  
Purba Purnama
Keyword(s):  
Mechanical Properties ◽  
Molecular Weight ◽  
High Molecular Weight ◽  
Nucleating Agent ◽  
Solution Casting ◽  
Casting Method ◽  
Crystalline Fraction ◽  
Crystalline Structures ◽  
Solution Casting Method

Stereocomplexation is one of several approaches for improving polylactide (PLA) properties. The high molecular weight of poly L-lactide (PLLA) and poly D-lactide (PDLA) homopolymers are a constraint during the formation of stereocomplex PLAs (s-PLAs). The presence of s-PLA particles in PLA PLLA/PDLA blends can initiate the formation of s-PLA crystalline structures. We used the solution casting method to study the utilization of s-PLA materials from high molecular weight PLLA/PDLA blends for increasing s-PLA formation. The s-PLA particles initiated the formation of high molecular weight PLLA/PDLA blends, obtaining 49.13% s-PLA and 44.34% of the total crystalline fraction. In addition, the mechanical properties were enhanced through s-PLA crystalline formation and the increasing of total crystallinity of the PLLA/PDLA blends. The s-PLA particles supported initiation for s-PLA formation and acted as a nucleating agent for PLA homopolymers. These unique characteristics of s-PLA particles show potential to overcome the molecular weight limitation for stereocomplexation of PLLA/PDLA blends.

The evolution of crystalline structures during gel spinning of ultra-high molecular weight polyethylene fibers

Soft Matter ◽  
2018 ◽  
Vol 14 (44) ◽  
pp. 8974-8985 ◽  
Author(s):  
Christopher K. Henry ◽  
Giuseppe R. Palmese ◽  
Nicolas J. Alvarez
Keyword(s):  
Molecular Weight ◽  
High Molecular Weight ◽  
Crystalline Structure ◽  
Weissenberg Number ◽  
Crystalline Morphology ◽  
Gel Spinning ◽  
Uhmwpe Fiber ◽  
Crystalline Structures ◽  
Ultra High Molecular Weight ◽  
Polyethylene Fibers

The Weissenberg number during gel spinning controls the crystalline morphology of the as spun UHMWPE fiber. The final drawn crystalline morphology strongly depends on the starting as-spun crystalline structure.

Effects of high molecular weight component on crystallization of polyethylene under shear flow

Polymer ◽  
2006 ◽  
Vol 47 (15) ◽  
pp. 5669-5677 ◽  
Author(s):  
Y. Ogino ◽  
H. Fukushima ◽  
G. Matsuba ◽  
N. Takahashi ◽  
K. Nishida ◽  
...  
Keyword(s):  
Molecular Weight ◽  
Shear Flow ◽  
High Molecular Weight ◽  
High Molecular Weight Component
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