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  • 09월 20일 16시 이후 : 초록수정 불가능, 일정확인 및 검색만 가능

제126회 대한화학회 학술발표회 및 총회 Grafting of poly(acrylic acid) from silica particles in gelation process

2020년 9월 16일 23시 49분 13초
POLY.P-37 이곳을 클릭하시면 발표코드에 대한 설명을 보실 수 있습니다.
10월 21일(수) 17:00~17:30
Polymer Chemistry
저자 및
Jungju Ryu, Daewon Sohn*
Department of Chemistry, Hanyang University, Korea
Particle-induced polymer networks have attracted great attention in wide area of environmental, industrial, and biomedical application, due to the facile method to achieve better properties in mechanical strength and functionality. Thus, there have been a lot of efforts to reveal gelation mechanisms of the particle-induced polymer networks. However, these investigations have focused on the overall characteristics of networks, and the details about particle behaviors have not been addressed. Here, we explored behaviors of particles that provide a platform of polymer grafts, upon gelation time evolution, in order to know how they make networks. We prepared silica-poly(acrylic acid) hydrogels by introducing gamma-ray treated silica particles, which have roles of crosslinker and initiator. The gelation steps and structural characteristics were investigated by using dynamic light scattering and small angle neutron scattering measurements. We observed the incipient gels have two phases consisting of long-range connections and aggregates of dense clusters, and also revealed the grafting magnitudes of polymer chains are irregular at the initial stages. When the system was close to the gel threshold, three dimensional networks appeared, and the dynamics of the system became relatively homogeneous. Based on the observations, we presented the method to attain silica-poly(acrylic acid) core-shell particles. Consequently, this study provides the details about the silica particles in gelation and effective strategies to develop advanced materials.