Browsing by Author "Lin, I. -Hong"

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Bioinspired assembly of functional block-copolymer nanotemplates
(2013)
Lin, I. -Hong
;
Cheng, Chih-Chia
;
Chuang, Wei-Tsung
;
Chen, Jem-Kun
;
Jeng, U. -Ser
A new concept on bioinspired assembly of functional diblock copolymers, capable of forming different microstructures through nucleobase-induced supramolecular interactions, has been explored. In this paper, a new series of uracil-functionalized poly(epsilon-caprolactone)-b-(4-vinylbenzyl uracil)s (PCL-b-PVBU) have been prepared which exhibit a high self-complementary ability in solution and solid states owing to the formation of uracil-uracil pairs by induced hierarchical self-assembly. The ordered morphologies of PCL-b-PVBU diblock copolymers changed from a lamellar, hexagonally packed cylinder to a sphere with respect to the content of the hydrogen bond segment. Moreover, we further show that the PCL segment could be easily extracted by enzymatic degradation, leading to a cylinder porous structure of long-range order, which gives a facile method for the fabrication of uracil-functionalized nanotemplates. In addition, bio-complementary PCL-b-PVBU/9-hexadecyladenine (AC16) hierarchical supramolecular complexes formed through strong cooperative hydrogen bonding between the uracil group of PVBU and the adenine group of A-C16. When the mixing ratios of PCL-b-PVBU/AC16 differ from the stoichiometric ratio, these complexes self-assemble into well-ordered lamellar and hexagonal structures; the changing morphology at different AC16 loadings reveals that the molecular structures of the PCL-b-PVBU/AC16 complexes are readily tailored.
Nucleobase-grafted polycaprolactones as reversible networks in a novel biocompatible material
(2013)
Lin, I. -Hong
;
Cheng, Chih-Chia
;
Huang, Cheng-Wei
;
Liang, Mei-Chih
;
Chen, Jem-Kun
A series of nucleobase-grafted polycaprolactones have been prepared which exhibits a high complementary ability in solution and solid states owing to the formation of uracil-adenine pairs by induced hierarchical self-assembly. In addition, they can self-organize into spherical structure and result in excellent biomaterial properties.
Nucleobase-grafted supramolecular polymers for tuning the surface properties
(2014-02-07)
Lin, I. -Hong
;
Cheng, Chih-Chia
;
Li, Ke-Fong
;
Chen, Jem-Kun
;
Chiu, Chih-Wei
Nucleobase-grafted polycaprolactone has been prepared which exhibits amorphous nature, rapid photoresponse and controlled surface properties in the solid state owing to the formation of uracil-diamidopyridine (U-DAP) pairs by induced physical cross-linking. In addition, they can self-organize to alter material behavior with light, switching both optical and thermal properties. Remarkable changes in the surface morphology and the contact angle with water were also observed.