Effect of crosslink density on fracture behavior of model epoxies containing block copolymer nanoparticles

Jia (Daniel) Liu; Hung Jue Sue; Zachary J. Thompson; Frank S. Bates; Marv Dettloff; George Jacob; Nikhil Verghese; Ha Pham

doi:10.1016/j.polymer.2009.05.006

Effect of crosslink density on fracture behavior of model epoxies containing block copolymer nanoparticles

Jia (Daniel) Liu, Hung Jue Sue, Zachary J. Thompson, Frank S. Bates, Marv Dettloff, George Jacob, Nikhil Verghese, Ha Pham

Chemical Engineering and Materials Science

Research output: Contribution to journal › Article › peer-review

107 Scopus citations

Abstract

Model diglycidyl ether of bisphenol-A based epoxy resins containing well-dispersed 15 nm block copolymer (BCP) nanoparticles were prepared to study the effect of matrix crosslink density on their fracture behavior. The crosslink density of the model epoxies was varied via the controlled epoxy thermoset technology and estimated experimentally. As expected, it was found that the fracture toughness of the BCP-toughened epoxy is strongly influenced by the crosslink density of the epoxy matrix, with higher toughenability for lower crosslink density epoxies. Key operative toughening mechanisms of the above model BCP-toughened epoxies were found to be nanoparticle cavitation-induced matrix shear banding for the low crosslink density epoxies. The toughening effect from BCP nanoparticles was also compared with core-shell rubber-toughened epoxies having different levels of crosslink density. The usefulness of the present findings for designing toughened thermosetting materials with desirable properties is discussed.

Original language	English (US)
Pages (from-to)	4683-4689
Number of pages	7
Journal	Polymer
Volume	50
Issue number	19
DOIs	https://doi.org/10.1016/j.polymer.2009.05.006
State	Published - Sep 10 2009

Bibliographical note

Funding Information:
The authors would like to gratefully acknowledge the funding supports from The Dow Chemical Company and the Department of Energy (DOE) through grant 5–35908 and through a subcontract to UT–Battelle (No. 4000041622) for the current research.

Keywords

Block copolymer nanoparticle
Crosslink density
Epoxy toughening

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10.1016/j.polymer.2009.05.006

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title = "Effect of crosslink density on fracture behavior of model epoxies containing block copolymer nanoparticles",

abstract = "Model diglycidyl ether of bisphenol-A based epoxy resins containing well-dispersed 15 nm block copolymer (BCP) nanoparticles were prepared to study the effect of matrix crosslink density on their fracture behavior. The crosslink density of the model epoxies was varied via the controlled epoxy thermoset technology and estimated experimentally. As expected, it was found that the fracture toughness of the BCP-toughened epoxy is strongly influenced by the crosslink density of the epoxy matrix, with higher toughenability for lower crosslink density epoxies. Key operative toughening mechanisms of the above model BCP-toughened epoxies were found to be nanoparticle cavitation-induced matrix shear banding for the low crosslink density epoxies. The toughening effect from BCP nanoparticles was also compared with core-shell rubber-toughened epoxies having different levels of crosslink density. The usefulness of the present findings for designing toughened thermosetting materials with desirable properties is discussed.",

keywords = "Block copolymer nanoparticle, Crosslink density, Epoxy toughening",

author = "Liu, {Jia (Daniel)} and Sue, {Hung Jue} and Thompson, {Zachary J.} and Bates, {Frank S.} and Marv Dettloff and George Jacob and Nikhil Verghese and Ha Pham",

note = "Funding Information: The authors would like to gratefully acknowledge the funding supports from The Dow Chemical Company and the Department of Energy (DOE) through grant 5–35908 and through a subcontract to UT–Battelle (No. 4000041622) for the current research.",

year = "2009",

month = sep,

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doi = "10.1016/j.polymer.2009.05.006",

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T1 - Effect of crosslink density on fracture behavior of model epoxies containing block copolymer nanoparticles

AU - Liu, Jia (Daniel)

AU - Sue, Hung Jue

AU - Thompson, Zachary J.

AU - Bates, Frank S.

AU - Dettloff, Marv

AU - Jacob, George

AU - Verghese, Nikhil

AU - Pham, Ha

N1 - Funding Information: The authors would like to gratefully acknowledge the funding supports from The Dow Chemical Company and the Department of Energy (DOE) through grant 5–35908 and through a subcontract to UT–Battelle (No. 4000041622) for the current research.

PY - 2009/9/10

Y1 - 2009/9/10

N2 - Model diglycidyl ether of bisphenol-A based epoxy resins containing well-dispersed 15 nm block copolymer (BCP) nanoparticles were prepared to study the effect of matrix crosslink density on their fracture behavior. The crosslink density of the model epoxies was varied via the controlled epoxy thermoset technology and estimated experimentally. As expected, it was found that the fracture toughness of the BCP-toughened epoxy is strongly influenced by the crosslink density of the epoxy matrix, with higher toughenability for lower crosslink density epoxies. Key operative toughening mechanisms of the above model BCP-toughened epoxies were found to be nanoparticle cavitation-induced matrix shear banding for the low crosslink density epoxies. The toughening effect from BCP nanoparticles was also compared with core-shell rubber-toughened epoxies having different levels of crosslink density. The usefulness of the present findings for designing toughened thermosetting materials with desirable properties is discussed.

AB - Model diglycidyl ether of bisphenol-A based epoxy resins containing well-dispersed 15 nm block copolymer (BCP) nanoparticles were prepared to study the effect of matrix crosslink density on their fracture behavior. The crosslink density of the model epoxies was varied via the controlled epoxy thermoset technology and estimated experimentally. As expected, it was found that the fracture toughness of the BCP-toughened epoxy is strongly influenced by the crosslink density of the epoxy matrix, with higher toughenability for lower crosslink density epoxies. Key operative toughening mechanisms of the above model BCP-toughened epoxies were found to be nanoparticle cavitation-induced matrix shear banding for the low crosslink density epoxies. The toughening effect from BCP nanoparticles was also compared with core-shell rubber-toughened epoxies having different levels of crosslink density. The usefulness of the present findings for designing toughened thermosetting materials with desirable properties is discussed.

KW - Block copolymer nanoparticle

KW - Crosslink density

KW - Epoxy toughening

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Effect of crosslink density on fracture behavior of model epoxies containing block copolymer nanoparticles

Abstract

Bibliographical note

Keywords

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