摘要
聚乙二醇(PEG400)助引发DL-丙交酯形成的大分子二醇,经1,6-六亚甲基二异氰酸酯(HDI)偶联、哌嗪(PPZ)扩链后制得线性嵌段聚氨酯脲(PEG400-PUU-PPZ)。因PEG400的增韧作用和PPZ环状结构的增强作用使得PEG400-PUU-PPZ可望具有优良的力学性能。通过系统研究扩链时间(1~5h)和温度(30~60℃)对PEG400-PUU-PPZ特性黏度的影响,开发了一种梯度升温扩链的新工艺。结果表明,与恒温扩链相比,梯度升温扩链所得PEG400-PUU-PPZ的分子量更高、分子量分布更窄;相应地,其拉伸模量和屈服强度更高,表现出明显的强韧性材料的特征,可望用作骨组织修复材料。
A linear segmented poly(urethane-urea) (PEG400-PUU-PZZ) was prepared from poly(ethylene glycol) (PEG400) co-initiated poly(D,L-lactic acid) macrodiol (PDLLA-PEG400-PDLLA), hexamethylene diisocyanate (HDI) as a coupling agent, and piperazine (PPZ) as a chain extender. The flexible PEG400 and rigid PPZ may endow high mechanical properties to PEG400-PUU-PZZ. In this study, the effects of chain extension time (1 to 5 h) and temperature (30 to 60 ℃) on the intrinsic viscosity of PEG400-PUU-PZZ were thoroughly investigated, and a new extension process of step heating, i.e. 30 ℃ for 1 h, 40℃ for 1 h and 50 ℃ for 2 h, was developed. Compared with constant temperature heating, the step heating resulted in higher M, and narrower PDI of PEG400-PUU-PZZ. Correspondingly, its elastic modulus and yield strength were obviously enhanced, suggesting that PEG400 PUU-PZZ could be a promising material in bone repairs.
出处
《功能材料》
EI
CAS
CSCD
北大核心
2017年第9期9216-9220,共5页
Journal of Functional Materials
基金
国家自然科学基金资助项目(31370946)
重庆市应用开发计划重大资助项目(cstc2014yykfC50002)
关键词
聚氨酯脲
哌嗪
聚乙二醇
力学性能
梯度升温
poly(urethane-urea)
piperazine
poly(ethylene-glycol)
mechanical properties
step heating