Boltorn型超支化聚酯的合成与表征

以季戊四醇(PEL)、三羟甲基丙烷(TMP)和2,2-二羟甲基丙酸(DMPA)为原料,合成了3种端羟基超支化聚酯(HBPE),即分别是以PEL为核的HBPE、以TMP为核的HBPE和无核的HBPE。采用FTIR、13C NMR、GPC等方法对其结构进行了表征,3种HBPE的Fréchet支化度分别为41.86%,41.49%和39.77%,而Frey支化度分别为32.29%,31.37%和23.11%。研究了中心核分子对HBPE的溶解性、特性黏度的影响。结果表明,随着核分子官能度的增加,HBPE的溶解性变好,特性黏度增加,支化度(DB)增加,分子量多,分散系数(PD I)变小。

Synthesis and characterization of the Boltorn hyperbranched polyesters

Three hyperbranched polyesters were synthesized based on 2,2-bis(hydroxymethyl)propionic acid(DMPA) and a pentaerythritol(PEL) core,a trimethanol propane(TMP) core and with no core,which were characterized by FTIR,13C NMR and GPC.The degree of branching defined by Fréchet of the three HBPEs are 41.86%,41.49% and 39.77% respectively,however,the degree of branching defined by Frey are 32.29%,31.37% and 23.11%.The effects of central core in hyperbranched polyesters to solubility and intrinsic viscosity were studied.The results indicated hyperbranched polyester's solubility,intrinsic viscosity and the degree of branching(DB) increased,but the polydispersity index(PDI) decreased as the functionality of core increased.