Thermoset Blends of an Epoxy Resin and Polydicyclopentadiene

Rohde, Brian J.; Le, Kim Mai; Krishnamoorti, Ramanan; Robertson, Megan L.

doi:10.1021/acs.macromol.6b01649

Title: Thermoset Blends of an Epoxy Resin and Polydicyclopentadiene

Journal Article · Wed Nov 30 00:00:00 EST 2016 · Macromolecules

DOI:https://doi.org/10.1021/acs.macromol.6b01649· OSTI ID:1337189

Rohde, Brian J. ^[1]; Le, Kim Mai ^[1]; Krishnamoorti, Ramanan ^[1]; Robertson, Megan L. ^[1]

Univ. of Houston, TX (United States)

In this work, the mechanical properties of two chemically distinct and complementary thermoset polymers were manipulated through development of thermoset blends. The thermoset blend system was composed of an anhydride-cured diglycidyl ether of bisphenol A (DGEBA)-based epoxy resin, contributing high tensile strength and modulus, and polydicyclopentadiene (PDCPD), which has a higher toughness and impact strength as compared to other thermoset polymers. Ultra-small-angle and small-angle X-ray scattering analysis explored the morphology of concurrently cured thermoset blends, revealing a macroscopically phase separated system with a surface fractal structure across blended systems of varying composition. The epoxy resin rich and PDCPD rich phases exhibited distinct glass transitions (T_g’s): the T_g observed at higher temperature was associated with the epoxy resin rich phase and was largely unaffected by the presence of PDCPD, whereas the PDCPD rich phase T_g systematically decreased with increasing epoxy resin content due to inhibition of dicyclopentadiene ring-opening metathesis polymerization. The mechanical properties of these phase-separated blends were in reasonable agreement with predictions by the rule of mixtures for the blend tensile strength, modulus, and fracture toughness. Scanning electron microscopy analysis of the tensile and fracture specimen fracture surfaces showed an increase in energy dissipation mechanisms, such as crazing, shear banding, and surface roughness, as the fraction of the more ductile component, PDPCD, increased. These results present a facile method to tune the mechanical properties of a toughened thermoset network, in which the high modulus and tensile strength of the epoxy resin can be largely retained at high epoxy resin content in the blend, while increasing the fracture toughness.

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Research Organization:: Argonne National Laboratory (ANL), Argonne, IL (United States). Advanced Photon Source (APS)

Sponsoring Organization:: USDOE Office of Science (SC); National Science Foundation (NSF); Norman Hackerman Advanced Research Program; Texas Space Grant Consortium

Grant/Contract Number:: AC02-06CH11357; CMMI-1334838; 003652-0022-2013; NNX10AI96H; DGE-0840889

OSTI ID:: 1337189

Journal Information:: Macromolecules, Vol. 49, Issue 23; ISSN 0024-9297

Publisher:: American Chemical SocietyCopyright Statement

Country of Publication:: United States

Language:: ENGLISH

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Cited by: 45 works

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