Static and Dynamic Thermomechanical Properties of Phase-Separated Epoxy Networks with Tuned Microstructures

Jones, Brad Howard; C’deBaca, Francesca M.; Nissen, Erin J.; Ku, Angela Y.; Kopatz, Jessica Whitney; Huynh, Nha Uyen; Leguizamon, Samuel Carlos; Van Meter, Kylie E.

doi:10.1021/acsapm.4c02347

Title: Static and Dynamic Thermomechanical Properties of Phase-Separated Epoxy Networks with Tuned Microstructures

Journal Article · Sat Oct 19 00:00:00 UTC 2024 · ACS Applied Polymer Materials

DOI: https://doi.org/10.1021/acsapm.4c02347 · OSTI ID:2540243

^[1]; C’deBaca, Francesca M. ^[1]; Nissen, Erin J. ^[1]; Ku, Angela Y. ^[1]; Kopatz, Jessica Whitney ^[1]; Huynh, Nha Uyen ^[1];

^[1];

^[1]

Sandia National Laboratories (SNL-NM), Albuquerque, NM (United States)

Here, polymerization-induced phase separation is a useful method for the construction of heterogeneous epoxy networks with properties exceeding their homogeneous counterparts. In this work, we examine the static and dynamic thermomechanical properties of phase-separated epoxy networks salient to their application as encapsulants. Three heterogeneous epoxy-amine networks with nano-, meso-, and macro-phase-separated morphologies comprised of hard and soft domains are compared to a rigid, unstructured network. The glass transition profiles of the heterogeneous networks are complex, spanning many decades in the frequency domain. The nanophase-separated morphology leads to higher coefficient of thermal expansion, yet surprisingly is characterized by reduced residual stress. Under both quasi-static and dynamic compression (strain rates of order 10^–3 and 10³ s^–1, respectively), the nanophase-separated network also exhibits higher modulus and strength. In split-Hopkinson bar experiments, the energy dissipation characteristics of the epoxy networks were nearly identical. Curiously, however, the Hugoniot response of the macro-phase-separated network determined by ballistic shockwave analysis indicates a remarkable ability of this material to mitigate shockwave propagation in comparison to many homogeneous and heterogeneous polymer materials. Collectively, this work reveals several previously unreported phenomena with respect to structure–property relationships in phase-separated epoxy networks, illustrating the potential value of systematically tuned microstructures for optimization of application-specific physical properties.

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Research Organization:: Sandia National Laboratories (SNL-NM), Albuquerque, NM (United States)

Sponsoring Organization:: USDOE Laboratory Directed Research and Development (LDRD) Program; USDOE National Nuclear Security Administration (NNSA)

Grant/Contract Number:: NA0003525

OSTI ID:: 2540243

Report Number(s):: SAND--2025-03536J

Journal Information:: ACS Applied Polymer Materials, Journal Name: ACS Applied Polymer Materials Journal Issue: 21 Vol. 6; ISSN 2637-6105

Publisher:: ACS PublicationsCopyright Statement

Country of Publication:: United States

Language:: English

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36 MATERIALS SCIENCE
Biopolymers
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Materials
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Phase separation
Residual stress
Shock
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Title: Static and Dynamic Thermomechanical Properties of Phase-Separated Epoxy Networks with Tuned Microstructures

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