环氧大豆油扩链内增韧酚醛树脂的合成与应用

合成了一种具有优异韧性和热稳定性的覆铜板用环氧大豆油内增韧改性酚醛树脂.采用FTIR表征了改性酚醛树脂的分子结构,用SEM观察了改性酚醛树脂样品冲击断面的微观形貌,并对改性酚醛树脂制备的覆铜板的性能进行了研究,以获得最佳的合成工艺.文中还对改性酚醛树脂的增韧机理进行了探讨,发现其主要反应机理为:部分环氧大豆油在叔胺催化下与酚羟基进行醚化反应,同时环氧大豆油与多元胺发生扩链反应,最终生成与酚醛预聚体接枝的长链环氧大豆油环氧树脂.当环氧大豆油添加量为30%、固化剂含量达7%时,树脂的综合性能较佳.扩链后的环氧大豆油具有显著的增韧作用,它与酚醛树脂构成内增韧的交联网络,内增韧结构对改善覆铜板的耐焊性起着关键作用.

Synthesis and Application of Phenolic Resin Internally Toughened by Chain Extension Polymer of Epoxidized Soybean Oil

In this paper,first,a novel phenolic resin internally toughened by epoxidized soybean oil(ESO) with good toughness and thermal stability was prepared as the matrix resin of copper clad laminate(CCL).Next,FT-IR was adopted to characterize the molecular structure of the modified phenolic resin and SEM was used to observe the micro morphology of the resin intersections with impact.Then,the properties of CCLs prepared with the modified phenolic resin were studied to determine the optimal processing conditions.Finally,the corresponding toughening mechanism was investigated.It is demonstrated that the toughening relies mainly on the triethanolamine-catalyzed etherification reaction between phenol hydroxyl and ESO and the chain extension polymerization between ESO and multi-amine,which presents long-chain ESO epoxy grafting on the phenolic resin prepolymer.Moreover,it is found that the ESO-toughened phenolic resin possesses optimal performance at an ESO content of 30% and a curing agent content of 7%,and that the flexible ESO epoxy possessing significant toughening effect can crosslink with the phenolic resin to form an internally toughened network for improving the solderleaching resistance of the CCL prepared with the modified phenolic resin.