摘要
Aliphatic hyperbranched poly(ester amine)s with terminal acrylate groups were synthesized by Michael addition reaction between pizine and trimethylol propanetriacrylate (TMPTA) under various molar ratios, and their structures were characterized by 1H NMR,GPC and DSC analysis.The multi peaks within δ 4.04～4.18 (RCH 2OCOR′) in the 1H NMR spectra were analyzed and the peaks at δ 4.15, δ 4 06～4 07 and δ 4.04 can be assigned to terminal ( T ),linear ( L ) and dendritic units ( D ),respectively.Based on 1H NMR spectra,the degree of branching ( DB) for these polymers were calculated by using both the Fréchet method and the Frey method.With the molar ratio between pizine and TMPTA increased to 1/1,the terminate units decreased,both of the dendritic and linear units increased,while M n and M w/ M n became large and the T g value became high,accordingly.Moreover,cured films were obtained through UV radiation of the polymers.The gel contents for the films decreased with increasing the molar ratio between pizine and TMPTA,which may account for the changes of their mechanical properties.
Aliphatic hyperbranched poly(ester-amine) s with terminal acrylate groups were synthesized by Michael addition reaction between pizine and trimethylol-propanetriacrylate (TMVrA) under various molar ratios, and their structures were characterized by H-1-NMR, GPC and DSC analysis. The multi-peaks within delta 4.04 similar to 4. 18 (RCH2OCOR') in the H-1-NMR spectra were analyzed and the peaks at delta 4.15, delta 4.06 similar to 4.07 and delta 4.04 can be assigned to terminal (T) linear (L) and dendritic units (D), respectively. Based on H-1-NMR spectra, the degree of branching (DB) for these polymers were calculated by using both the Frechet method and the Frey method. With the molar ratio between pizine and TMPTA increased to 1/1 the terminate units decreased, both of the dendritic and linear units increased, while M-n and M-w/M-n became large and the T-g value became high, accordingly. Moreover, cured films were obtained through UV radiation of the polymers. The gel contents for the films decreased with increasing the molar ratio between pizine and TMPTA, which may account for the changes of their mechanical properties.
出处
《高分子学报》
SCIE
CAS
CSCD
北大核心
2005年第2期301-304,共4页
Acta Polymerica Sinica
基金
国家自然科学基金 (基金号 2 0 2 0 40 0 5
5 0 2 3 3 0 3 0 )
清华大学基础研究基金 (基金号 2 0 0 2 0 3 0 )资助项目
