Study on β-Nucleated Controlled-Rheological Polypropylene Random Copolymer: Crystallization Behavior and a Possible Degradation Mechanism

2012 ◽  
Vol 52 (2) ◽  
pp. 761-770 ◽  
Author(s):  
Jiashu Fan ◽  
Jiachun Feng
Keyword(s):  
Crystallization Behavior ◽  
Degradation Mechanism ◽  
Random Copolymer ◽  
Polypropylene Random Copolymer

Tailoring toughness of injection molded bar of polypropylene random copolymer through processing melt temperature

2011 ◽  
Vol 60 (12) ◽  
pp. 1705-1714 ◽  
Author(s):  
Feng Luo ◽  
Ke Wang ◽  
Jinwen Wang ◽  
Hua Deng ◽  
Qin Zhang ◽  
...  
Keyword(s):  
Random Copolymer ◽  
Melt Temperature ◽  
Injection Molded ◽  
Polypropylene Random Copolymer

Toughened polypropylene random copolymer with olefin block copolymer

2016 ◽  
Vol 107 ◽  
pp. 295-301 ◽  
Author(s):  
Qilin Ren ◽  
Jiashu Fan ◽  
Qinglong Zhang ◽  
Jianjun Yi ◽  
Jiachun Feng
Keyword(s):  
Block Copolymer ◽  
Random Copolymer ◽  
Polypropylene Random Copolymer

Exploring the roles of molecular structure on the β-crystallization of polypropylene random copolymer

2017 ◽  
Vol 24 (12) ◽  
Author(s):  
Hao Zheng ◽  
Fangxinyu Zeng ◽  
Zhengfang Chen ◽  
Jian Kang ◽  
Jinyao Chen ◽  
...  
Keyword(s):  
Molecular Structure ◽  
Random Copolymer ◽  
Polypropylene Random Copolymer

Calcium Carbonate Formation on Cross-Linked Polyethylene (PEX) and Polypropylene Random Copolymer (PP-r)

2005 ◽  
Vol 128 (2) ◽  
pp. 251-254 ◽  
Author(s):  
Patricia Sanft ◽  
Lorraine F. Francis ◽  
Jane H. Davidson
Keyword(s):  
Calcium Carbonate ◽  
Random Copolymer ◽  
Reynolds Numbers ◽  
Unit Surface Area ◽  
Carbonate Concentration ◽  
Carbonate Formation ◽  
Unit Surface ◽  
Before And After ◽  
Polymer Tubes ◽  
Polypropylene Random Copolymer

The accumulation of calcium carbonate (referred to as scale) on the surface of cross-linked polyethylene and polypropylene random copolymer tubes is compared to that on copper. Water with total calcium and carbonate concentration of 3×10−3M and a pH of approximately 9.1, yielding a supersaturation of 7.8, was pumped through the tubes at a velocity of 0.07m∕s for 2.5, 5, and 7.5h. Flow was laminar with Reynolds numbers of <1000. Sections of the tubes were analyzed at the designated time points to determine the extent of scaling. Results include scanning electron microscope images of the tube surfaces before and after exposure to the supersaturated water and chemical analysis to determine the mass of calcium carbonate per unit surface area. Measured scaling rates of the two polymer tubes are similar to that of copper.

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