A novel alkynyl neutral polymer-bonding agent (NPBA) was synthesized by a three-step approach. The molecular structure and thermal characteristics of alkynyl NPBA were analyzed. To reveal the influence of alkynyl NPBA on the mechanical properties of glycidyl azide polymer (GAP)-based propellants, two types of GAP propellants with Desmodur N-100 and alkynyl-terminated polyethylene glycol (APE) as curing agents were prepared and mechanical properties of the propellants were fully investigated. Tensile strength and initial modulus of propellants were notably promoted with the increase in alkynyl groups content of alkynyl NPBA with Desmodur N-100 as curing agent. The interfacial adhesion property between GAP binders and CL-20 fillers was greatly improved by alkynyl NPBA, and dewetting phenomenon of propellants during uniaxial tension was markedly attenuated. The wettability of GAP binders and solid fillers was good and the enhancing effect of alkynyl NPBA on tensile strength of GAP propellants was notable. Tensile strength and initial modulus of propellants were notably increased and their maximum elongation was decreased with the increase of alkynyl group content of alkynyl NPBA in propellants when APE was used as a curing agent. In addition, the dynamic mechanical analysis results showed that internal friction resistance of GAP molecular segment motion of GAP propellants was increased and interactions between GAP binder and solid fillers became much stronger with alkynyl NPBA. A notable enhancement effect on tensile strength and initial modulus of GAP propellants was demonstrated with alkynyl NPBA as bonding agent.

中文翻译：

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炔基中性聚合物键合剂的合成及其对缩水甘油基叠氮化物聚合物推进剂拉伸强度的增强作用

通过三步法合成了一种新型的炔基中性聚合物键合剂（NPBA）。分析了炔基NPBA的分子结构和热学性质。为了揭示炔基NPBA对基于缩水甘油基叠氮化物（GAP）的推进剂的机械性能的影响，制备了两种以Desmodur N-100和炔基封端的聚乙二醇（APE）为固化剂的GAP推进剂，并测定了其力学性能。对推进剂进行了充分调查。以Desmodur N-100为固化剂，随着炔基NPBA炔基含量的增加，推进剂的拉伸强度和初始模量得到明显提高。炔基NPBA大大改善了GAP粘合剂和CL-20填充剂之间的界面粘合性能，推进剂在单轴拉伸过程中的去湿现象明显减弱。GAP粘合剂和固体填料的润湿性良好，炔基NPBA对GAP推进剂抗张强度的增强作用显着。当使用APE作为固化剂时，随着推进剂中炔基NPBA炔基含量的增加，推进剂的拉伸强度和初始模量显着提高，并且最大伸长率降低。此外，动态力学分析结果表明，使用炔基NPBA可以提高GAP推进剂GAP分子链段运动的内摩擦阻力，并且GAP粘合剂与固体填料之间的相互作用变得更强。