申请人:——
公开号:US20040171777A1
公开(公告)日:2004-09-02
This invention concerns a free radical polymerization process, selected chain transfer agents employed in the process and polymers made thereby, in which the process comprises preparing polymer of general Formula (A) and Formula (B) comprising contacting: (i) a monomer selected from the group consisting of vinyl monomers (of structure CH
2
═CUV), maleic anhydride, N-alkylmaleimide, N-arylmaleimide, dialkyl fumarate and cyclopolymerizable monomers; (ii) a thiocarbonylthio compound selected from Formula (C) and Formula (D) having a chain transfer constant greater than about 0.1; and (iii) free radicals produced from a free radical source; the polymer of Formula (A) being made by contacting (i), (ii) C and (iii) and that of Formula (B) by contacting (i), (ii) D, and (iii); and (iv) controlling the polydispersity of the polymer being formed by varying the ratio of the number of molecules of (ii) to the number of molecules of (iii); wherein Q, R, U, V, Z, Z′, m, p and q are as defined in the text.
1
该发明涉及一种自由基聚合过程,该过程采用选择的链转移剂,并由此制得的聚合物,其中该过程包括接触通式(A)和通式(B)的聚合物,其制备方法包括:(i)与乙烯单体(结构为CH2=CHX)、马来酸酐、N-烷基马来酰亚胺、N-芳基马来酰亚胺、二烷基富马酸酯和环聚合单体等一组中选择的单体接触;(ii)选择通式(C)和通式(D)的硫代氨基酸盐类,其链转移常数大于约0.1;(iii)自由基源产生的自由基;通式(A)的聚合物是通过接触(i)、(ii)C和(iii)制备的,通式(B)的聚合物是通过接触(i)、(ii)D和(iii)制备的;(iv)通过改变(ii)分子数与(iii)分子数的比率来控制正在形成的聚合物的聚分散度;其中Q、R、U、V、Z、Z'、m、p和q在文本中定义。