烯基聚乙二醇嵌段共聚物的合成及室温固化

Synthesis of Allyl Poly (ethylene glycol) Block Copolymer and its Curing at Room Temperature

摘要:

以聚乙二醇(PEG)为引发剂，三氟化硼乙醚(BF3•Et2O)络合物为催化剂，缩水甘油醚(GA)和烯丙基缩水甘油醚(AGE)为共聚单体通过阳离子开环聚合反应，制备了烯基聚乙二醇嵌段共聚物粘合剂(PEG-PGA-PAGE)。采用红外光谱(FTIR)、核磁共振氢谱(1HNMR)对产物的结构进行了表征，并以对苯二腈氧化物为固化剂固化合成的粘合剂制备出弹性体。考察了GA、AGE分时间段加和同时加两种不同加料顺序下合成的粘合剂(PEG-PGA-PAGE-1和PEG-PGA-PAGE-2)制备弹性体的力学和热性能。结果表明：粘合剂可实现室温固化，GA、AGE分段加制备的PEG-PGA-PAGE-1固化弹性体的力学性能和耐热性更强，其拉伸强度可达0.948 MPa，断裂伸长率可达89.32 %，邵氏硬度可达23.8 Ha，储能模量可达361.05 MPa，玻璃化转变温度（Tg）为-41.85 ℃，接触角为74 ℃。室温固化提高了弹性体的力学性能和热稳定性，有望应用于复合固体推进剂。

Abstract:

Allyl poly (ethylene glycol) block copolymer(PEG-PGA-PAGE)was synthesized by cationic ring opening polymerization using polyethylene glycol (PEG) as initiator, BF3•Et2O complex as catalyst, glycidyl ether (GA) and allyl glycidyl ether (AGE) as monomers. The product structure was characterized by FTIR and 1H NMR. The mechanical properties and thermal properties of the two elastomers (peg-pga-page-1 and peg-pga-page-2) prepared by curing binders prepared by adding GA and AGE separately and simultaneously with terephthalobisnitrile oxide were investigated. Results show that the binder can be cured at room temperature, the cured elastomer peg-pga-page-1 prepared by subsection addition of GA and AGE has better mechanical properties and thermal properties, the tensile strength of 0.948 MPa, the elongation at break of 89.32%, shaw hardness of 23.8 Ha, the storage modulus of 361.05 MPa, Tg is - 41.85 ℃, the contact angle is 74 ℃. Room temperature curing improves the mechanical properties and thermal stability of elastomers and is expected to be used in composite solid propellants.