Citation: . POLYMERIZATION OF p-DIETHYNYLBENZENE INITIATED BY Ni(C≡CC6H4C≡CH)2(PPH3)2*[J]. Chinese Journal of Polymer Science, ;2001, 19(3): 303-309. shu

POLYMERIZATION OF p-DIETHYNYLBENZENE INITIATED BY Ni(C≡CC6H4C≡CH)2(PPH3)2*

Received Date: 12 July 2000

Homogeneous polymerization of p-diethynylbenzene initiated by nickel acetylide Ni(C ≡ C C6H4 C ≡ CH)2(PPh3)2has been investigated in terms of different solvents, addition agents, atmosphere gases, catalyst concentrations, monomerconcentrations and polymerization temperatures. The yield and catalytic efficiency approach 88% and 11. 1 kg polymer/molNi, respectively, under the optimum conditions: [cat] = 0.01 mol/L, [M] = 1.0 mol/L, NEt3/cat (mol ratio) = 3～5, 1,4-dioxane/toluene (volume ratio) = 1 and T =25℃ for 5 h.The polymerization rate equation can be expressed as Rp=kp[M][cat]2, where kp=0.47 L2·mol-2·S-1(25℃).The overall polymerization activation energy was found to be 203 KJ·mol-.Poly(p-diethynylbenzene）so obtained is soluble in THF,CHCl3 and toluene with weight-average molecular weights as high as 27,100 and a rich-trans extended π-conjugated polyene chain structure with pendent groups of p-C6H4C=CH.
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