松香的菲环骨架结构能够赋予聚合材料优良的热稳性和柔韧性,将松香中特定树脂酸结构直接合成高纯度聚合单体是解决这一问题的有效途径.在前期研究基础上,文中进一步开发了具有三官能度的马来海松酸三烯丙酯聚合单体,首先将松香树脂酸进行Diels-Alder反应得到马来海松酸酐,并经过中和反应得到马来海松酸钠.在微波辅助下,马来海松酸钠与烯丙基氯在相转移催化剂作用下制备得到GC纯度为96.1％的聚合单体——马来海松酸三烯丙酯.反应产物的结构通过红外光谱、气相色谱-质谱联用技术、核磁共振、元素分析等技术表征.UV固化反应的结果表明,具有3种活性官能团的马来海松酸聚合单体有很强的聚合活性,所得聚合物具有较好的热稳定性,分解温度达到300℃,玻璃化转变温度为49.57℃.
Method of synthesis of sodium rnaleopimarate by the reaction of maleopimaric acid with sodium hydrogen was developed.Tri-allyl maleopimarate was synthesized using sodium maleopimarate and allyl choloride as raw material and hexadecyl trimethyl ammonium bromide as catalyst.The chemical structure of tri-allyl rnaleopimarate was confirmed by infrared spectrum,mass spectrometry,elemental analysis,1H-and 13C-NMR spectroscopy.The results show that three terminal vinyl double bond of the structure is generated,and the product can be used as monomer for polymerization.The infrared spectra show that the double bonds are opened during the curing reaction.The UV cured products have excellent thermal stability and the glass transition temperature is 49.57℃.
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