HEMA封端聚(氨酯-酰亚胺)的本体法合成及γ射线辐射效应

Bulk Preparation andγ-Ray Irradiation-Induced Effect of Poly(Urethane-Imide) Using 2-Hydrooxyethyl Methylacrylate as End Capping Reagent

以甲基丙烯酸β-羟乙酯为封端剂,用本体聚合法由六亚甲基二异氰酸酯、均苯四酸二酐和聚碳酸酯二醇合成了双键封端的聚(氨酯-酰亚胺)(PUI),并用红外光谱(FT-IR)、X射线衍射(XRD)、动态力学性能(DMA)、热重分析(TGA)和热机械分析(TMA)等方法探讨了γ射线辐熙对所得PUI结构性能的影响。结果表明,在γ射线辐照下,PUI发生交联反应,不饱和度和结晶度都有不同程度的变化;tanδ值显著下降,并明显向高温方向移动,并且,辐照剂量越大,移动也越大。辐照后PUI热稳定性显著提高,在辐照剂量为50kGy和75kGy的条件下表现出最好的热稳定性。

Poly（urethane-imide） （PUI） containing 2-hydrooxyethyl methylacrylate （HEMA） was synthesized by the method of hulk polymerization from hexamethylene 1,6 diisocyanate（HDI） ,pyromelltic dianhydride（PMDA） and polycarbonate diol. The effect of γ-ray irradiation on the structure and properties of PUI was investigated with Fourier transform infrared spectroscopy （FT-IR）, X-ray diffraction（XRD）, dynamic thermomechanical analysis （DMA）, thermal gravimetric analysis （TGA） and thermomechanical analysis （TMA）. The results show that the erosslinked structure is existed in the irradiated PUI, the changes of crystalline order appears, the number of tan decreases, the appeared temperature of tanδincreases, the thermal stability increases.