화학공학소재연구정보센터
홈 로그인 로그아웃 연락처 사이트맵
Polymer(Korea), Vol.39, No.1, 151-156, January, 2015
Export Citation
용매의 반복 방향성 결정화를 통해 제작된 새로운 다공성재료
Novel Porous Materials Prepared by Repeated Directional Crystallization of Solvent
김현진, 이종휘†
  • 중앙대학교 공과대학 화학신소재공학부
Hyun Jin Kim, and Jonghwi Lee†
  • Department of Chemical Engineering and Materials Science, Chung-Ang University, 221 Heukseok-dong, Dongjak-gu, Seoul 156-756, Korea
E-mail:
초록
본 연구에서는 디메틸실록산과 벤젠으로 구성된 단량체 용액에 방향성 결정화를 두 차례 진행하여 새로운 기공 구조를 제작하였다. 우선 첫 번째 용매의 방향성 결정화를 통해 벌집 형태의 기공 구조를 제작하였다. 상기 용액을 다시 담지한 뒤, 다시 방향성 결정화를 진행하게 되면 벌집 형태의 기공 구조 내에 또 다른 기공 구조가 혼재되어 있는 새로운 구조를 얻을 수 있었다. 반복된 방향성 결정화로 제조된 다공성 소재는, 한번의 방향성 결정화로 제조된 소재보다 압입탄성계수와 압입경도가 높았으며, 높은 농도의 용액으로 두 번째 방향성 결정화가 진행된 경우에 최대 증가치(압입탄성계수: 2140% 증가, 압입경도: 2330% 증가)를 얻을 수 있었다. 반면, 두 번째 방향성 결정화가 진행된 경우, 첫 번째 방향성 결정화만 진행된 경우보다 기공률과 접촉각은 감소하였으며, 높은 농도의 용액으로 두 번째 방향성 결정화가 진행된 경우 이들 물성의 최대 감소(기공률: 21% 감소, 접촉각: 36% 감소)를 관찰할 수 있었다.
Herein, novel porous structures were fabricated from monomer solutions of dimethylsiloxane and benzene by directional crystallization in twice. First, a honeycomb-like structure was fabricated by 1st directional crystallization of solvent. By infiltration of the solution and subsequent 2nd directional crystallization, novel structures of different pores in the honeycomb-like structure were fabricated. The porous materials prepared by the repeated directional crystallization have higher indentation modulus and hardness than those of the samples prepared by single directional crystallization. When a higher solution concentration was used in 2nd directional crystallization, the maximum increase (indentation modulus: 2140% increase, indentation hardness: 2330% increase) was obtained. On the other hand, porosity and contact angle were lower in the samples from 2nd directional crystallization than those from 1st directional crystallization. A large decreases was observed, when a relatively high concentration was used in 2nd directional crystallization (porosity: 21% decrease, contact angle: 36% decrease).
Keywords:porous materials;polydimethylsiloxane;melt crystallization;directional freezing;ice templating.
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