Water-induced surface structure of poly(dimethylsiloxane)-containing block copolymers
Water-induced surface structure of poly(dimethylsiloxane)-containing block copolymers / Nam-Ju Jo, Jae Hwan Chun, Kwon Taek Lim, Ei-Sup Jang, Won-Ki Lee
p. 821-825 ; 29 cm
수록자료: Macromolecular research. Polymer Society of Korea. Vol.21 no.7(2013 July), p. 821-825 21:7<821 ISSN 1598-5032 저자: Nam-Ju Jo, Department of Polymer Science and Engineering, Pusan National University 저자: Jae Hwan Chun, Department of Polymer Science and Engineering, Pusan National University 저자: Kwon Taek Lim, Department of Imaging System Engineering, Pukyong National University 저자: Ei-Sup Jang, Department of Polymer Engineering, Pukyong National University 저자: Won-Ki Lee, Department of Polymer Engineering, Pukyong National University E-MAIL: email@example.com
Two triblock copolymers, polyester-b-poly(dimethylsiloxane) (PDMS)-b-polyester, were synthesized by the ring-opening polymerization with both hydrophobic and water-repellent hydroxyl-terminated PDMS and hydrolytically degradable ester monomers. The $$T_gs$$ of the polyester blocks were controlled by ɛ-caprolactone/lactide mixture or lactide only. The surface composition of the triblock copolymers was measured by angle-dependent electron: X-ray photoelectron spectroscopy. The results showed that the PDMS block with a low surface energy in the copolymers was quite segregated in the surface region; the copolymer films showed significantly higher mole fractions of PDMS (0.78–0.86) at a low takeoff angle compared with their bulk mole fractions (0.015–0.02). When the films were exposed to water at 20 °C for 70 min, the mole fractions of surface PDMS were decreased to 0.3–0.5 because of the water-repellent hydrophobicity and the chain mobility of both blocks.