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Toughening Epoxy Resins with Core—Shell (HTPB-PMMA/PMA) Rubber Particles
Kang, Sunghee,Kim, Daeyeon,Kim, Taehee,Lee, Wonjoo,Kim, Hyeon-Gook,Chung, Jin Suk,Lim, Choong-Sun,Chang, Sang-Mok,Seo, Bongkuk American Scientific Publishers 2017 Journal of Nanoscience and Nanotechnology Vol.17 No.10
<P>Epoxy resins, which are thermoset polymers, are widely used in coatings and adhesives because of their good heat and chemical resistance, as well as their adhesive strength. However, these polymers are brittle, meaning they have a poor resistance to impact. The brittleness of epoxy resins can be reduced using a variety of toughening agents, such as core-shell particles, polyurethanes, or polyester polymers. In the particular case of core-shell particles, the core part is usually composed of rubber polymers, such as polybutadiene, to improve the impact strength of the epoxy resins; while the shell part is made of glassy polymers, like poly(methylmethacrylate). In this study, core-shell rubber particles (CSRPs) synthesized by emulsion polymerization, were used to improve the physical properties of epoxy resins. Fourier transform infrared spectroscopy (FT-IR) was used to study the structure of the CSRPs. Differential scanning calorimetry (DSC) was conducted to find the glass transition temperature (T-g) of the samples. The morphology of the synthesized CSRPs was analyzed using a scanning electron microscope (SEM) and a transmission electron microscope (TEM). Furthermore, the impact strength of cured epoxy compositions, including that of CSRPs, was measured with an Izod impact tester.</P>
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손기영,이철민,Belong Cho,Youl Lee Lym,Seung Won Oh,Wonjoo Chung,Jin-Seok Lee,DuShin Park,Han Suk Kim 대한의학회 2012 Journal of Korean medical science Vol.27 No.11
This study was to evaluate the effect of additional brief counseling by a primary care physician on lifestyle modification of examinees after a periodic health examination. 1,000participants of the 2007 Korean national health screening program were asked to note any variation in their health behavior after participating in the screening program. The degree of comprehensive motivation for lifestyle modification was assessed in terms of stages of health behavior change. We calculated odds ratio of positive change (enhanced stage of change) with multiple logistic regression analysis and age-adjusted proportion of positive changers. Of 989 respondents, 486 and 503 received the basic and additional programs,respectively. Additional group were more likely to be positive changer than basic group (adjusted OR 1.78; 95% CI 1.19-2.65), and this was more prominent in older age group (adjusted OR 2.38, 95% CI 1.23-4.58). The age-adjusted proportions of positive changers were 22.7% (95% CI, 17.9-28.3) and 36.2% (95% CI, 30.4-42.4) in the basic and additional groups, respectively (P < 0.001). The additional consultation led to improvements in the stage of health behavior change after the health examination. Thus,such a consultation should be considered when designing a health-screening program.
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