HTPE交联改性NC  

Modification of Crosslink NC by HTPE

作　　者：任治[1] 李笑江[1] 刘萌[1] 王晗[1] 吴雄岗[1] 

机构地区：[1]西安近代化学研究所,陕西西安710065

出　　处：《含能材料》2015年第7期638-643,共6页Chinese Journal of Energetic Materials

基　　金：总装备部预研基金资助(JCKY31)

摘　　要：用溶液共混法,制备了不同比例的硝化棉(NC)/端羟基聚醚(HTPE)物理共混物以及NC/HTPE/甲苯-2,4-二异氰酸酯(TDI)交联聚合物。用混合焓法研究了物理共混体系的相容性。用动态热机械分析研究了共混物的动态力学性能。用傅里叶变换红外(FT-IR)光谱法研究了NC和HTPE间的交联反应状态及分子间相互作用。结果表明,NC/HTPE是部分相容体系,且相容性与组成有关。随着HTPE比例的增加,共混体系的玻璃化温度逐渐降低,当NC含量为30%时,NC/HTPE物理共混体系的低温Tg为-9.8℃,交联体系的Tg为-1.4℃,相比NC的Tg有大幅度的降低。与NC/HTPE物理共混体系相比,化学交联可使NC和HTPE的相容性增加。交联后的异氰酸酯基在2270 cm-1处的特征吸收峰消失,说明交联反应比较完全。共混后NC的羟基和硝基的伸缩振动吸收峰均向低波数移动,说明NC和HTPE间存在氢键相互作用。交联之后,羟基和硝基的吸收峰移动减小,说明交联使NC和HTPE间的氢键作用被化学键作用部分取代。The physical blends of nitrocellulose（N C） /hydroxy terminated polyether（HTPE） with different proportions and N C /HTPE/toluene-2 4-diisocyanate（TDI） cross-linked polymers were prepared by a solution mixing method.The compatibility of NC and HTPE were studied by the enthalpy of mixing method.The dynamic mechanical properties of the blends were analyzed by dynamic thermal mechanical a—nalysis.The crosslink reaction state between NC and HTPE as well as the interaction between the molecules were studied by means of Fourier transform infrared（FT-IR） spectroscopy.Results show that two polymers are a partial miscible system and the degree of miscibility is relevant with the constitution of the blends.With the proportion of HTPE increase,the glass transition temperature of the blend system decreases gradually.When the mass fraction of N C is 30%,the Tg of N C /HTPE physical blend system is — 9.8 ℃,while the Tg of the chemical crosslink system is- 1.4 ℃,both the Tg of the two systems reduced greatly in contrast with the Tg of NC.Compared with the NC /HTPE physical blend system,the chemical cross-linking can make the compatibility of NC and HTPE increase.The characteristic absorption peak of isocyanate group at 2270 cm^（-1） disappears after crosslink,demonstrating that the crosslink reaction is relatively complete.The stretching vibration absorption peak of hydroxy and nitro group of N C after blending shifts to low wave numbers,indicating the existence of hydrogen bond interaction between NC and HTPE.After crosslinking,the shift of hydroxy and nitro group decreases,showing that the hydrogen bond interaction between NC and HTPE is partly substituted by chemical bond interaction.

关 键 词：硝化棉 端羟基聚醚(HTPE) 化学交联 玻璃化温度 相容性 

分 类 号：V512[航空宇航科学与技术—航空宇航推进理论与工程]