화학공학소재연구정보센터
홈 로그인 로그아웃 연락처 사이트맵
Korean Journal of Chemical Engineering, Vol.35, No.1, 263-271, January, 2018
DOI10.1007/s11814-017-0249-0  Export Citation
Effect of assembly condition on the morphologies and temperature-triggered transformation of layer-by-layer microtubes
Choonghyun Sung†, and Jodie L. Lutkenhaus1
  • Polymeric Materials Engineering Major, Division of Advanced Materials Engineering, Dong-Eui University, Busan 47340, Korea
  • 1Artie McFerrin Department of Chemical Engineering, Texas A&M University, College Station, Texas 77843, United States, USA
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The morphology and temperature-triggered transformation of the LbL microtubes consisting of poly(allylamine hydrochloride) (PAH) and poly(acrylic acid) (PAA) were investigated as a function of assembly pH, polyelectrolyte molecular weight (MW), and multivalent ions. The as-made microtubes assembled at pH 5.5 (PAH)/5.5 (PAA) showed perforations on the surface, while those assembled at pH 7.5 (PAH)/3.5 (PAA) showed smooth surface without perforations. At the same MW, the microtubes assembled at pH 7.5/3.5 transformed more effectively compared to those assembled at pH 5.5/5.5. The aspect ratio of microtubes assembled at pH 7.5/3.5 decreased from 5 to 2 as the temperature increased from room temperature to 121 °C. Furthermore, transformation of microtubes was facilitated as the MW of polyelectrolytes decreased. The dimensional stability of microtubes was influenced by the MW and added multivalent ions. These results were discussed in the context of the structure of the LbL assemblies.
Keywords:Layer-by-layer;Transformation;Microtube;Assembly pH;Molecular Weight
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