= 아 래 =
1. 일 시 : 2014. 6. 12 (목), 16:30 ~
2. 장 소 : 신소재공학과 2417호 강의실
3. 연 사 : 정호용 교수 (Florida State University 부임예정)
4. 제 목 : Chemistry and Applications of Biologically-Inspired and Bio-Derived Polymers
Polymer science and materials science are inseparable fields. It is amazing to look at the recent advances in polymer science being used for various materials applications, however, there are still many remaining aspects to be learned from nature for advanced polymer applications. Among many recent bioinspired materials, bio-adhesives are gaining extensive interest in the bio-polymer community. One example is the polymers used by marine organisms such as mussels. The key feature of mussels-inspired adhesives is strong adhesion in water. The wet adhesion properties are derived from a special amino acid, 3,4-dihydroxylphenylalanine (DOPA). This DOPA moiety was thus integrated into various artificial polymers as a way to overcome the limitations of current artificial adhesives, namely their poor wet adhesion properties. The strong wet adhesion can be applied to biomedical adhesives because the human body is composed of 60% water. A new pressure sensitive adhesive was also developed from DOPA containing polymers that was combined with microfibrillar structures inspired from Gecko’s feet. The new pressure sensitive adhesive showed excellent repeatable dry/wet adhesion. The DOPA containing adhesive’s chemical structure-property relation, viscoelasticity, coating technique and aging have been extensively studied to enhance the material’s adhesion properties. Lignin is the second most abundant biopolymer derived from plants, and it is a major byproduct from pulp and paper production. However, lignin’s utility is limited because of its complex chemical structure, low reactivity, poor processability and variability depending on source and extraction method. Therefore, new methods of lignin modification are required to use lignin productively for commodity materials. A Lewis-acid-catalyzed modification was developed to copolymerize the lignin with petroleum-derived polymers. Many state of the art methods, such as controlled radical polymerization and click chemistry, were successfully performed to integrate lignin and the synthetic polymers. The prepared lignin-based polymers showed enhanced mechanical properties in many aspects and can be a promising renewable and sustainable biomaterials.