News
Committed to providing raw and auxiliary materials for the rubber industry
EPDM has excellent resilience.
Release time:
2025-12-18
Source:
Author:
EPDM (Ethylene-Propylene-Diene Monomer) is a ternary copolymer of ethylene, propylene, and a non-conjugated diene.
EPDM (Ethylene-Propylene-Diene Monomer) is a ternary copolymer of ethylene, propylene, and a non-conjugated diene.
The properties of synthetic rubber are closely related to its molecular structure. The macromolecular backbone of EPDM is saturated. In EPDM, the "E" stands for ethylene, the "P" stands for propylene, and the "D" stands for the third monomer unit—in this case, a diene (containing two double bonds). Thus, ethylene, propylene, and the diene each contribute one double bond to the polymerization of the main chain, ultimately resulting in a saturated main chain.
For polymers, double bonds represent a very vulnerable point. When exposed to aging or heat-induced free radical attacks, the double bonds are the first targets—this means that the double-bond sites are the first to suffer damage. Therefore, if the main polymer chain contains no double bonds at all, it indicates that the macromolecule is highly stable.
Therefore, EPDM is characterized by its exceptionally excellent aging resistance. This is because its main chain is saturated, highly flexible, and exhibits outstanding elasticity. Moreover, its density is extremely low—among all polymers, it has the lowest density, reaching as low as 0.86.
In addition, EPDM exhibits excellent resilience. As we know, plastics generally are crystalline, with macromolecules arranged very closely together. Because the macromolecules have little room to move freely, they feel stiff to the touch.
Recent News
Ningbo Calite New Material Co., Ltd.
Phone:0574-653511130574-65351333
Fax: 0574-65351118
Email:create@create163.com
Website: www.caeate163.com
Address: Aohu Industrial Zone, Meilin Subdistrict, Ninghai, Ningbo
Mobile website