| Summary: | 碩士 === 國立成功大學 === 化學工程學系 === 89 === The goal of this research is to synthesize a new “DP-type novolac” from acid-catalyzed reaction of 2,6-dimethylphenol and dipentene(DP). DP-type novolac with aliphatic terpene structure should provide excellent hydrophobicity and low dielectric properties.
The DP-type novolac is epoxidized to “DP-type epoxy” which is advanced with phosphorus or bromine containing diphenol to the flam retardant epoxy resins, and is also converted to DP-type cyanate ester as a curing agent.
In the first part, DP-epoxy was cured with 4 kinds of diamine as curing agent and compared with BPA-type epoxy (DEGBA). The cured DP-type epoxy resins show better properties in glass transition temperature, water absorption, dielectric property than BGEBA epoxy resin.
In the other part, the bromine or phosphorus-containing flame retardant DP-type advanced epoxy was cured with DP-type cyanate ester and compared with epoxy-cyanate resin of BPA-type. Althought the incorporation of flame retardant element (P,Br) into epoxy has lowered glass transition temperature and thermal decomposition temperature at 5 wt% (Td-5%), however, the hydrophobicity and dielectric properties were not affected.In addition , the DP-type epoxy-cyanate resins exhibited better thermal stability, dielectric property and less water absorption than BPA-type. From LOI and UL-94 analysis, the epoxy-cyanate resins of DP-type which contained 1.1 wt% of P-element have exhibited the same flame retardancy as the one which contained 21wt% of Br-element.
As a whole, DP-type epoxy resin and epoxy-cyanate resin , DP-type can provide better physical and electrical properties than BPA-type.
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