Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 10, Issue 16, Pages 13924-13930Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.7b19085
Keywords
bio-based; diphenolate esters; epoxy resin; structural dielectric; broadband dielectric spectroscopy (BDS); diglycidyl ether of bisphenol A (DGEBA)
Funding
- National Science Foundation Partnerships for International Research and Education (PIRE) Program [1243313]
- CWRU: The Materials for Opto/Electronics Research and Education (MORE) Center (Ohio Third Frontier grant) [TECH 09-021]
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Thermoset bio-based diglycidyl ether of diphenolate esters (DGEDP) exhibit comparable mechanical properties as petroleum-derived diglycidyl ether of bisphenol A (DGEBA), whereas DGEDP is derived from levulinic acid, a safe and readily renewable feedstock. To determine the potential replacement of DGEBA as dielectric materials, a series of DGEDP-esters (i.e., methyl, ethyl, propyl, and butyl esters) were synthesized and studied. Broadband dielectric spectroscopy revealed that DGEDP-propyl has the highest dielectric constant in the series, comparable to DGEBA. Differences in the dielectric properties of DGEDP-esters is attributed to the interplay of segmental, small local, and side-chain motions on one hand and free volume and stric hindrance on the other.
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