Synthesis and application of phenolic resin internally toughened by chain extension polymer of epoxidized soybean oil

Abstract

A novel epoxidized soybean oil (ESO) internally toughened phenolic resin(ESO-IT-PR) with both good toughness and excellent thermal stability was prepared as the matrix resin of copper clad laminate (CCL). FTIR was adopted to investigate the molecular structure of modified phenolic resins and SEM was used to observe the micro morphology of their impacted intersections. The properties of CCLs prepared with these modified phenolic resins were studied to determine the optimal process and investigate the toughening mechanism. The main modifying mechanism is the etherification reaction between phenol hydroxyl and ESO catalyzed by triethanolamine and the chain extension polymerization between ESO and multi-amine gives the long-chain ESO epoxy grafting on the phenolic resin prepolymer. when the ESO content is 30% and the curing agent content is 7%, the ESO toughened phenolic resin possesses optimal performance. The flexible ESO epoxy shows significant toughening effect and it crosslinks with the phenolic resin to form an internally toughened network, which is the key factor for improving the solderleaching resistance of CCL prepared with this modified phenolic resin.

References

1. Huang F R Jiao Y S Phenolic Resin and Its ApplicationBeijingChemicalindustry press
2. Konii S Yoshimura Y Nanaumi K Yasuzawa K Yoshida T Shinko T Process for producing internally plasticized phenolic resins.US patent. 4209429.1980-7-24
3. Nomoto M Yoshimura Y Nanaumi K Nanaumi K Yasuzawa K Nomoto M Yoshimura Y Nanaumi K et al.Production of phenolic resin for laminating.JP patent. 60248723.1985-12-9
4. Ogasawara K Hayashi T Ogasawara K, HayashiT. Production of phenolic resin for laminated sheet.JP patent: 60084317, 1985-5-13
5. Min H C Ho Y B In J C The effect of chain length of flexible diacid on morphologyand mechanical property of modified phenolic resinPolymer 2002 43(16)44374444. doi:10.1016/S0032‐3861(02)00226‐4
6. Ma S Q Lu W K Lin Q et al.Studies on the reaction process of epoxidized linseedoil and phenol and their structure characterizationJournal of Harbin Institute of Electrotechnics 1996 19(1)813
7. Chen P Liu S P Eopxy resinBeijingChemical Industry Press
8. Wu H D Ma C C M Lin J M Processability and properties of phenoxy resin toughenedphenolic resin compositesJournal of AppliedPolymer Science 1997 63(7)911917. doi:10.1002/(SICI)1097‐4628(19970214)63:7<911::AID‐APP11>3.0.CO;2‐U
9. Park S J Jin F L Lee J R Effect of biodegradable epoxidized castor oil on physicochemicaland mechanical properties of epoxy resinsMacromolecular Chemistry and Physics 2004 205(15)20482054. doi:10.1002/macp.200400214
10. Park S J Jin F L Lee J R Thermal and mechanical properties of tetrafunctional epoxyresin toughened with epoxidized soybean oilMaterials Science and Engineering A 2004 374(1–2)109114. doi:10.1016/j.msea.2004.01.002
11. Kaynak C Cagatay O Rubber toughening of phenolicresin by using nitrile rubber and amino silanePolymer Testing 2006 25(3)296305. doi:10.1016/j.polymertesting.2006.01.004