葡萄糖改性水性聚氨酯的合成与表征

Synthesis and characterization of waterborne polyurethane modified by glucose

采用预聚体合成法,以二羟甲基丙酸(DMPA)、葡萄糖(PG)为亲水扩连剂和交联剂制备一种水性聚氨酯乳液。利用FTIR对胶膜结构进行表征,证实葡萄糖已引入聚氨酯主链。TG分析得出PG改性后的聚氨酯胶膜热稳定性增强。研究了PG用量对该聚氨酯胶膜力学性能的影响,结果表明:随着PG用量的增加,胶膜力学强度得到改善。当PG的用量由0增加至4.68%时,断裂伸长率从529.9%降至276.4%,拉伸强度从10.9 MPa增加至24.2 MPa。

Waterborne polyurethane（WPU）emulsion was synthesized by a prepolymer process using dimethylol propionic acid（DMPA）and glucose as hydrophilic agent and crosslinking agent,respectively.The structure of the films was confirmed by means of FTIR.The test results indicated that glucose was introduced into the main chain of polyurethane.TG analysis indicated that the thermal stability of WPU films modified with glucose was improved.The effect of glucose content on the mechanical properties of the WPU films was studied.The results showed that the properties of WPU films were improved with increasing weight of PG.When glucose content increased from 0 to 4.68%,elongation at break decreased from 529.9% to 276.4% and tensile strength increased from 10.9 MPa to 24.2 MPa.