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Chemical Structure of Random Copolymerized Polypropylene

Categories:Random copolymer News
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Time of issue:2022-09-22 14:03
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(Summary description)When the percentage of groups above X3 is large, the crystallinity of the copolymer will be significantly reduced, which has a great impact on the ultimate properties of the random copolymer.

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Chemical Structure of Random Copolymerized Polypropylene

Categories:Random copolymer News
Author:
Origin:
Time of issue:2022-09-22 14:03
Views:

Information

The randomness ratio X3/X5 can be determined. When the percentage of groups above X3 is large, the crystallinity of the copolymer will be significantly reduced, which has a great impact on the ultimate properties of the random copolymer. The effect of very high levels of ethylene in the copolymer on polymer crystallinity is similar to that of high atactic polypropylene content.

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Random PP copolymers are different from homopolymers in that ethylene molecules randomly inserted into the polymer backbone hinder the crystalline arrangement of polymer molecules. The decrease in the crystallinity of the copolymer causes changes in physical properties: random copolymers have reduced stiffness, improved impact resistance, and better transparency compared to PP homopolymers. Ethylene copolymers also have lower melting temperatures, which is an advantage in some applications.
Random copolymers contain more leatherables and random PP, and polymer chains with much higher ethylene content. This high level of leatherable extractables is present to varying degrees in all commercial copolymer materials depending on the polymerization process and creates difficulties in meeting Federal Food Administration (FDA) food contact regulations.

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