PENG Yuxing, LIU Jialin, DAI Hansong, CUN Linfeng. STUDY ON THE CYCLIZATION DURING THE CATIONIC POLYMERIZATION OF 1,3 PENTADIENE[J]. Acta Polymerica Sinica, 1997,(1):19-24.
PENG Yuxing, LIU Jialin, DAI Hansong, CUN Linfeng. STUDY ON THE CYCLIZATION DURING THE CATIONIC POLYMERIZATION OF 1,3 PENTADIENE[J]. Acta Polymerica Sinica, 1997,(1):19-24.DOI:
initiated by AlCl3 and (CF3SO3) 3Al.The polymer chain contains both linear segments and cyclic structures.The cyclic fractions of PDD prepared by AlCl3 and by (CF3SO3)3Al are respectively 25% and 48%.The cyclization reaction takes place through two processes:(Ⅰ)Intramolecular chain transter;(Ⅱ)protonic initiation.The process(Ⅱ)could be essentially hindered in the presence of DtBP.The cyclization of PPD induced by AlCl 3 occurs mostly through the process(Ⅰ) and the cyclization in the polymerization initiated by (CF3SO3)3 Al is induced mainly by the process(Ⅱ).In the process(Ⅱ)the cyclization takes place on the double bonds of the lateral groups of 1