The melt-transesterification polycondensation method necessitates elevated reaction temperatures and protracted reaction times in the copolymerization of modified isosorbide-based polycarbonates.This results in a decl...The melt-transesterification polycondensation method necessitates elevated reaction temperatures and protracted reaction times in the copolymerization of modified isosorbide-based polycarbonates.This results in a decline in molecular weight and color degradation of the copolymerized IS-PC.In this paper,the process of polyethylene glycol(PEG)modification was introduced in the synthesis of isosorbide-based copolycarbonate(PE_(X)HDC_(Y)C)by means of a melt chain extension method.As demonstrated by experimental findings,this method has the capacity to reduce the reaction temperature and shorten the reaction time.Additionally,it has been observed to enhance the molecular weight and overall properties of the material.Through the optimization of reaction conditions,a series of PE_(X)HDC_(Y)C with weight average molecular weight(M_(w))ranging from 19,004 g/mol to 73,294 g/mol were synthesized.The results demonstrated that the glass transition temperature(T_(g))of PE_(X)HDC_(Y)C decreased in conjunction with an increase in the PEG1000content.It is noteworthy that the PE_(X)HDC_(Y)C synthesized by this method exhibits an exceptional elongation at break,reaching up to 135.45%±24%.Furthermore,PE_(X)HDC_(Y)C demonstrates superior optical properties in comparison to bisphenol A polycarbonate(BPA-PC).展开更多
基金the financial support from the Key Deployment Program of the Chinese Academy of Sciences(No.ZDRW-CN-2022-1)the Key Research and Development Program of Sichuan Province(No.2025YFHZ0053)。
文摘The melt-transesterification polycondensation method necessitates elevated reaction temperatures and protracted reaction times in the copolymerization of modified isosorbide-based polycarbonates.This results in a decline in molecular weight and color degradation of the copolymerized IS-PC.In this paper,the process of polyethylene glycol(PEG)modification was introduced in the synthesis of isosorbide-based copolycarbonate(PE_(X)HDC_(Y)C)by means of a melt chain extension method.As demonstrated by experimental findings,this method has the capacity to reduce the reaction temperature and shorten the reaction time.Additionally,it has been observed to enhance the molecular weight and overall properties of the material.Through the optimization of reaction conditions,a series of PE_(X)HDC_(Y)C with weight average molecular weight(M_(w))ranging from 19,004 g/mol to 73,294 g/mol were synthesized.The results demonstrated that the glass transition temperature(T_(g))of PE_(X)HDC_(Y)C decreased in conjunction with an increase in the PEG1000content.It is noteworthy that the PE_(X)HDC_(Y)C synthesized by this method exhibits an exceptional elongation at break,reaching up to 135.45%±24%.Furthermore,PE_(X)HDC_(Y)C demonstrates superior optical properties in comparison to bisphenol A polycarbonate(BPA-PC).
