Effects of particle size and rubber content on fracture toughness in rubber-modified epoxies
SCIE
SCOPUS
- Title
- Effects of particle size and rubber content on fracture toughness in rubber-modified epoxies
- Authors
- Kim, DS; Cho, K; Kim, JK; Park, CE
- Date Issued
- 1996-03
- Publisher
- SOC PLASTICS ENG INC
- Abstract
- The effects of particle size of core-shell rubber on the fracture toughness of rubber-modified epoxies were investigated. Various sizes of core-shell rubber particles, from 0.16 to 1.2 mu m in diameter, were synthesized by seeded emulsion polymerization. Particle size effects were clearly seen for lower crosslinked diglycidyl ether of bisphenol A (DGEBA)/piperidine resin. Fracture toughness increased as the particle size of core-shell rubber decreased from 1.2 to 0.4 mu m. On the other hand, fracture toughness was constant in this range of particle sizes for higher crosslinked DGEBA/diaminodiphenylmethane (DDM) resin. Cavitation in the rubbery core and shear deformation in the matrix are the toughening mechanisms for DGEBA/piperidine resin, whereas cavitation is the only mechanism for DGEBA/DDM resin. Toughening effectiveness decreased with <0.2 mu m core-shell rubber particles since they are difficult to cavitate, The effects of core-shell rubber content on fracture toughness of rubber-modified epoxies were also examined. The optimum rubber content for maximum toughness of rubber-modified epoxies decreased with decreased particle size of core-shell rubber in shear deformable DGEBA/piperidine resin. But the fracture toughness of rubber-modified DGEBA/DDM resins increased as the rubber content increased.
- Keywords
- ELASTOMER-MODIFIED EPOXIES; TOUGHENING MECHANISMS; DEFORMATION; BLENDS; BEHAVIOR; POLYMER; MODEL; PHASE
- URI
- https://oasis.postech.ac.kr/handle/2014.oak/21614
- DOI
- 10.1002/pen.10463
- ISSN
- 0032-3888
- Article Type
- Article
- Citation
- POLYMER ENGINEERING AND SCIENCE, vol. 36, no. 6, page. 755 - 768, 1996-03
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