Cross-linking of polyethylene (FE) with vinyl silane is a widely used process, and cross-linking of polyethylene (FE) is one of the important means of PE modification. Cross-linking with silane coupling agents and azo compounds is one of the most economical methods using silane cross-linked polyethylene (XlPE).

Since the strength of silane XLPE does not change with time, it is now widely used in the production of pipes, especially for liquid transport pipes in the food industry, liquid and gas transport pipes in the chemical industry and other industries. Because of its good insulation properties, it is also used for the production of cables. The amount of silane coupling agent has a great influence on the tensile strength and elongation at break of XLPE, with the increase of coupling agent amount, the tensile strength gradually increases. After increasing to a certain degree, the tensile strength tends to decrease. The elongation at break tends to decrease with the increase of the amount of silane coupling agent, and when the amount is too large, the elongation at break increases. The addition of silane coupling agent to make PE moderate cross-linking can effectively increase the intermolecular linkage, so that the relative slip of molecular chains is not easy to occur, while the increase of polar groups, hindering the movement of chain segments, so that the forced high elasticity can not be achieved, and thus the tensile strength of XLPE is improved. During the cross-linking process, the crystallinity of the polymer often decreases, or the crystallization tendency decreases, so excessive cross-linking will, on the contrary, decrease the tensile strength and increase the elongation at break of XLPE.

At present, the coupling agents used as vinyl silane for cross-linking polyethylene (FE ) are mainly CFS-027 Vinyltrimethoxysilane [CAS 2768-02-7; VTMO; A-171; SILQUEST Y-9818 ; KH171] and CFS-080 Vinyltriethoxysilane [CAS 78-08-0; KBE1003; A-151; VTEOA; KH151] , two commonly used vinyl silanes.