端环氧基聚缩水甘油醚硝酸酯的合成及固化

Synthesis and Curing of Epoxy-tem inated Poly( glycidyl nitrate)

针对聚缩水甘油醚硝酸酯(PGN)与异氰酸酯固化反应易受环境水分影响、固化稳定性较差等问题,合成了端环氧基聚缩水甘油醚硝酸酯(e-PGN)。采用红外(IR)、核磁(NMR)和凝胶渗透色谱(GPC)进行了结构表征。测试了改性前后聚合物的主要物化性能。e-PGN的玻璃化转变温度、粘度、密度、热分解温度等主要物性与PGN的主要物性相近。研究了e-PGN与几种环氧固化剂[咪唑(IMD)、邻苯二甲酸酐(PA)、N-乙基乙二胺(NEED)、异佛尔酮二胺(IPDA)等]的固化反应。结果表明,e-PGN可与IMD、PA、NEED、IPDA等在60℃/70℃下反应固化,其中以PA为固化剂时,固化物力学性能最好,拉伸强度为0.912 MPa,断裂伸长率为354%;室温贮存8个月的固化试样其力学性能基本不变。

The reaction between the end hydroxyl of poly（ glycidyl nitrate）（PGN） and isocyanates is easily affected by ambient moisture, and the curing stability is poor. Aiming at these problems, epoxy-terminated poly（glycidyl nitrate） （e-PGN） was synthesized. Its structure was characterized by infrared spectroscopy（IR）, nuclear magnetic resonance（NMR） and gel permeation chromotagraph （GPC）, and its major physiochemical properties were tested. The main physical properties of e-PGN, such as glass transition temperature, viscosity, density, thermal decomposition temperature, were close to those of PGN. The curing reactions of e-PGN with epoxy curing agents, such as imidazole（IMD） , o-phthalic anhydride（ PA）, n-ethylethylenediamine（NEED） and isophoronediamine （IPDA） were studied. Results show that the curing reaction ofe-PGN with IMD, PA, NEED and IPDA at 60 ℃/70 ℃ can be performed. When PA is used as curing agent, the mechanical properties of the cured material outperformed; the tensile strength is0.912 MPa, and the elongation at break is 354%. in addition, the mechanical properties of the cured sampies stored at room temperature for 8 months remained almost unchanged.