1. Reporter:Chen-Kun Lin Adviser:Cheng-Chien Wang 2011.06.28

2. Epoxy resins have dimensional stability, satisfactory mechanical properties, so that they are widely used as coating, adhesion, lamination, casting and electronic encapsulation materials. However, the flammability of epoxy resins is a major problem in applications where high thermal and flame resistance are needed. Many approaches have been used to improve the flame retardancy of epoxy-resin composites. Introduction

3. A feasible way to reduce flammability of epoxy-resin composites is the utilization of flame-retardant agents or fire-resistant curing agents. Still commonly used are halogenated flame retardants, which appear to function principally by reacting with radicals produced during combustion (mainly H + and OH - ), generating less-reactive halogen radicals. However, these reactions result in the release of toxic, corrosive, halogenous gases, such as hydrogen chloride. Introduction

4. Consequently, low or zero use of halogen in flame retardants is the current trend. Increasing use is being made of phosphorus-containing flame retardants. The objective of this investigation is to reduce flammability of epoxy-resin composites using an anhydride with a pendent phosphorus and halogen-free group. Introduction

5. Materials 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide (DOPO) Itaconic acid Hexahydrophthalic anhydride (HHPA) and phthalic anhydride (PA) N-Benzyldimethylamine (BDMA) Tetrahydrofuran and n-hexane

6. Experimental Synthesis of (9,10 -dihydro -9 -oxa -10 -phosphaphenanthrene -10 -oxide ) methyl succinicanhydride (DMSA)

7. Experimental Curing of epoxy networks The mixture was continuously stirred and then placed in an oven at the desired curing temperature (130 ℃ ). The samples were cured in a hot press at 130 ℃ for 3 hr followed by 2 hr post-cure at 170 ℃.

8. Results and discussion Monomer synthesis and characterizations

9. Results and discussion Monomer synthesis and characterizations

10. Results and discussion Thermal properties

11. Results and discussion Thermal properties

12. Results and discussion Thermal properties

13. Results and discussion Flame properties

14. Results and discussion Flame properties

15. An aryl phosphinate anhydride (DMSA) was synthesizedby the addition and dehydration reaction of DOPO with itaconic acid. The a major degradation of those epoxy-resin composites took place in the same temperature range (350-450 ℃ ),and the initial decomposition temperature was not significantly shifted. Epoxy resins cured with DMSA exhibit higher LOI values and char yields compared with those cured by commercial curing agents, such as PA and HHPA. Conclusions

16. Furthermore, the LOI value and the char yield of the epoxy-resin composites increased with increasing phosphorus content. The utilization of appropriate amounts of DMSA in the epoxy systems would give good flame retardancy. Conclusions

17. 回收 NBR-BA 微乳液聚合

18. 0528-Size

19. 0529-Size

20. 0527EAc-Size

21. 0529EAc-Size

22. 0611EAc-Size

23. FTIR

24. 0624-FTIR