A novel polyamide containing xanthene structure and trifluoromethylphenoxy pendent was prepared from 9,9-bis[4-(4- aminophenoxy)phenyl]xanthene,a novel diamine with 2-(4-trifluoromethylphenoxy)terephthaloyl chloride,by the low temperature polycondensation.This new polyamide with the inherent viscosity of 0.95 dL/g was amorphous and readily soluble in polar solvents such as DMAc,m-cresol,etc.This polyamide showed the glass transition temperature(T_g) of 236℃,decomposition temperature (Td) at 5%weight loss...
Huang, Zhen ZhongWan, Xue MeiXiao, Hai BoSheng, Shou RiSong, Cai Sheng
A new fluorinated poly(ether amide) bearing xanthene group was prepared from 9,9-bis[4-(2-trifluoromethyl-4-aminophenoxy) phenyl]xanthene(BTFAPX) with 9,9-bis[4-(4-carboxyphenoxy)phenyl]xanthene(BCAPX) in the presence of triphenyl phosphate and pyridine(Py).The polymer had the weight-average molecular weight(M_w) of 69,000 and number-average molecular weight(Mn) of 39,000,showed the glass transition temperature(T_g) of 267℃,5%weight loss temperature(T_(d5)) over 460℃both in N_2 and air,and char yield of 62%at 800℃in N_2.This polymer was amorphous and readily soluble in amide-type solvents such as N,N-dimethylacetamide(DMAc),and even in m-cressol,Py and tetrahydrofuran(THF) at room temperature,and exhibited tensile strength of 74 MPa,elongation at break of 6%,tensile moduli of 2.2 GPa.The polymer had low dielectric constant of 3.69(100 Hz), low moisture absorption of 0.56%,and high transparency with an ultraviolet-visible absorption cut-off wavelength at 334 nm.
Ting LiShou Ri ShengMei Hong WeiCheng ChenCai Sheng Song
