Study On Copolymerization Of Ethylene With 1-Decene And Microstructure Of The Copolymer

As an alpha olefin,copolymerization of ethylene and 1-decene forms ethylene/1-decene copolymers with broad potential applications.The copolymers can be used as high-performance polymer materials such as linear low-density polyethylene,polyolefin elastomer,olefin block copolymers and so on.It has a good application prospect in China.The copolymerization of ethylene and 1-decene catalyzed by synthetic restricted geometric metallocene catalysts A（2-（tetramethylcyclopentadienyl）-6-tertbutylphenoxy-titanium dichloride）and B（2-（tetramethylcyclopentadienyl）-4,6-ditertbutylp-henoxy-titanium dichloride）with additives of Al（ⁱBu）₃/[Ph₃C]⁺[B（C₆F₅）₄]^-was studied.The sequence distribution of copolymer microstructures and the probability statistics of chain growth elementary reactions were analyzed.The copolymerization mechanism and the structure of copolymers were discussed.The results show that:（1）the content of copolymer 1-decene in the main chain of copolymer is between 14.3%and 67.2%（mass fraction）;（2）the growth mechanism of copolymer chain conforms to the first-order Markovian model chain growth mechanism;（3）the copolymer structure tends to polyethylene copolymer.1-decene is easier to be coordinated or inserted into{copolymer main chain-1-decene-1-decene-catalyst}sequence,and ethylene is easier to be coordinated or inserted into{copolymer main chain-ethylene-ethylene-catalyst}sequence;（4）with the increase of 1-decene concentration,copolymers（ethylene/1-decene）tend to polydecene structure;（5）1-decene is easier to be inserted into catalyst B.