Characterization of dicyclopentadiene and 5-ethylidene-2-norbornene as self-healing agents for polymer composite and its microcapsules
- Authors
- Lee, JK; Hong, SJ; Liu, X; Yoon, SH
- Issue Date
- Oct-2004
- Publisher
- POLYMER SOC KOREA
- Keywords
- self-healing; microcapsules; diene; polymeric composite
- Citation
- MACROMOLECULAR RESEARCH, v.12, no.5, pp 478 - 483
- Pages
- 6
- Journal Title
- MACROMOLECULAR RESEARCH
- Volume
- 12
- Number
- 5
- Start Page
- 478
- End Page
- 483
- URI
- https://scholarworks.bwise.kr/kumoh/handle/2020.sw.kumoh/22596
- DOI
- 10.1007/BF03218430
- ISSN
- 1598-5032
2092-7673
- Abstract
- Two different diene monomers [dicyclopentadiene (DCPD) and 5-ethylidene-2-norbornene (ENB)] as self-healing agents for polymeric composites were microencapsuled by in situ polymerization of urea and formaldehyde. We obtained plots of the storage modulus (G') and tan delta as a function of cure time by using dynamic mechanical analysis to investigate the cure behavior of the unreacted self-healing agent mixture in the presence of a catalyst. Glass transition temperatures (T-g) and exothermic reactions of samples cured for 5 and 120 min in the presence of different amounts of the catalyst were analyzed by differential scanning calorimetry. Of the two dienes, ENB may have advantages as a self-healing agent because, when cured under same conditions as DCPD, it reacts much faster in the presence of a much lower amount of catalyst, has no melting point, and produces a resin that has a higher value of T-g d. Microcapsules containing the healing agent were successfully formed from both of the diene monomers and were characterized by thermogravimetric analysis. Optical microscopy and a particle size analyzer were employed to observe the morphology and size distribution, respectively, of the microcapsules. The microcapsules exhibited similar thermal properties as well as particle shapes and sizes.
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Collections - Department of Mechanical Engineering > 1. Journal Articles
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