双端丙烯酸酯基聚异戊二烯液体橡胶的合成与紫外光固化

以双锂引发剂引发异戊二烯进行活性阴离子聚合，之后依次使用环氧乙烷和丙烯酰氯封端合成双端丙烯酸酯基聚异戊二烯（ATPI），并以其为预聚体，以丙烯酸甲酯为稀释剂，在紫外光照下制备了光固化弹性体。采用凝胶渗透色谱（GPC）、傅里叶变换红外光谱（FT-IR）、核磁共振氢谱（¹H-NMR）对产物ATPI进行了表征分析，结果表明：当采用机械搅拌方式，环氧乙烷加入10倍量（相比与活性种数量），封端6 h，丙烯酰氯加入1.5倍量（相比与活性种数量），封端1 h时，可制备丙烯酸酯基官能度达1.87的液体橡胶，其分子量约为3 000，分子量分布达1.25；当稀释剂占光固化胶液质量分数的65%时，光固化弹性体的拉伸强度达到6.16 MPa，断裂伸长率为138%，邵氏硬度为90.5。

Synthesis and UV-curing of diacrylate-terminated polyisoprene liquid rubber

Isoprene has been polymerized by a dilithium initiator, and subsequently reacted with ethylene oxide(EO) and acryloyl chloride(AC) as the end capping agent to synthesize diacrylate-terminated polyisoprene(ATPI). The ATPI was mixed with methyl acrylate/Irgacure-651 and used as a UV-curable elastomer. Polyisoprene(PI), dihydroxyl-terminated polyisoprene (HTPI) and ATPI were characterized by GPC, IR and ¹H-NMR spectroscopy. The results showed that when the EO]/Li] ratio was 10, the EO reaction time was 6 h, the AC]/Li] ratio was 1.5, and the AC reaction time was 1 h, the degree of acrylate functionalization of the liquid rubber reached 1.87, its molecular weight was about 3 000 and the molecular weight distribution was 1.25. When the amount of the diluent was 65%, the tensile strength of the UV-curable elastomer was 6.16 MPa, the elongation at break was 138% and the Shore hardness was 90.5.