Study of comparative tracking index on brominated epoxy and its application in copper clad laminates

Abstract

ABSTRACT:The study mainly investigates the improvement of the comparative tracking index (CTI) on brominated epoxy resins in a copper clad laminate. We compare the effects of the differences in structures of various epoxy resins on the CTI. In addition, on the basis of the proportion of inorganic fillers and type, we use Pauling's electronegativity theory to find inorganic materials that affect CTI. Experimental results show that the laminate surface CTI increases as the brominated epoxy resin content decreases. When looked at structurally, epoxys modified by phenolic resin systems had lower CTI values than those modified by bisphenol A type epoxy resin systems. Analyzing the effects of inorganic filler types, we found that the ideal bromide epoxy resin proportion and the CTI value of Al(OH) 3 could exceed 600 V.

Synthesis, characterization, and polymerization of brominated benzoxazine monomers and thermal stability/flame retardance of the polymers generated

“…Additionally, the cured resin from brominated expoxy resins has good dimensional stability and chemical tolerance. [1] Polybenzoxazines are recently developed class of phenolic polymers formed by ring-opening of the corresponding benzoxazines monomers. Typical monofunctional and bifunctional benzoxazine monomers, 3-phenyl-3,4-dihydro-2H-1,3-benzoxazine (P-a) and bis-(3-phenyl-3,4-dihydro-2H-1,3-benzoxazinyl) isopropane (B-a), are shown in Fig.…”