The Chengzhao ppr pipe sales ppr pipe proxy Shandong Matilda tube industry 

 The Chengzhao ppr pipe sales ppr pipe Agent Shandong Matilda Pipe Industry 
 PPR-chemical structure 

 PP random copolymers generally contain 1 - 7% (by weight) of ethylene molecules, and 99 - 93% (by weight) of propylene molecules. In the polymer chain, the ethylene molecules regularly inserted in the middle of the propylene molecules. In such a random or statistical copolymers, the majority (usually 75%), ethylene is a single molecule inserted combined into groups, called X3 (three consecutive ethylene [CH2] in order of priority in the main {TodayHot} chain), which can also be seen as an ethylene molecule is inserted in the middle of the two propylene molecules. 

 Another 25% of ethylene is inserted in the multiple molecular binding into the main chain, also known as X5 groups, with five consecutive methylene group (two ethylene molecules inserted in the middle of the two propylene molecules). It is difficult to distinguish between X5 and higher groups, such as X7, X9,. In view of this, XS and higher ethylene content of the groups together statistics for the X3,%. 

 The degree of randomness ratio X3/X5 can be determined. When the percentage of the groups X3 will significantly reduce the copolymer crystallinity This final performance impact of the random copolymer. Extremely high levels of ethylene copolymer polymer crystallinity, similar to the role when the content of atactic polypropylene. 

 Random PP copolymer is different from the homopolymer, random insertion of the ethylene molecule in the polymer main chain hinder the crystalline arrangement of the polymer molecules. The degree of crystallinity of the copolymer reduce the cause of changes in physical properties: random copolymers and PP homopolymers compared to the stiffness reduction, increased impact resistance, transparency and better. Ethylene copolymer, low melting temperature, which became their advantages in the application of certain aspects of 

 Random copolymer containing more leather extract and atactic PP, and much higher ethylene content of the polymer chains. This high leather extract content, depending on the polymerization process, to varying degrees in all the goods copolymer materials, and meet the Federal Food Administration (FDA) regulations for food contact {HotTag} caused difficult. 

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