Division of Materials Science, NAIST

Ms. Preeyarad Charoensumran (D2) in Nanomaterials and Polymer Chemistry Laboratory has received the Best Oral Presentation Award at PACCON 2018 (Thailand).

At Pure and Applied Chemistry International Conference (PACCON 2018 at Hat Yai in Thailand between 7th and 9th February 2018, Ms. Preeyarad Charoensumran (D2) in Nanomaterials and Polymer Chemistry Laboratory has received the Best Oral Presentation Award. The conference is held in Thailand as International Conference every year by Chemical Society of Thailand (CST). Prof. Dr. J. Fraser Stoddart delivered the plenary lecture this year, who is the Nobel Prize winner. Chairman and reviewers score the oral presentation of students at each session, regarding research contents, power point slides, discussion. Ms. Preeyarad Charoensumran received the Best Oral Presentation Award as the best presentation from the 15 presentations in the Polymer Chemistry session.

The assembly of polystyrene gels with limonene based on electrostatic interaction in the aqueous media

Preeyarad Charoensumran・Hiroharu Ajiro(Associate Professor)

First of all, I would like to thanks sincerely my supervisor, Assoc. Prof. Hiroharu Ajiro for his support and advice. Also thanks all members in Nanomaterials and Polymer Chemistry Laboratory for their helps and material science department for support the student activity, I really appreciate that. This award motivated me to keep developing myself. And I will do my best to achieve the research goal.

Generally, the organogels are known as a swollen materials with organic solvent. Most of the researches on organogels reported physical gel, which sometimes shows a low mechanical strength. Furthermore, they still have a limitation on toxicity of the organic solvent. Thus, we motivate to prepare the organogels with chemical crosslinking to improve the stability and mechanical strength of the material. In this study, we prepared polystyrene gels with limonene, expecting low-toxic natural compound and environment friendly materials. We also introduced the 4-vinylpyridine (green) and 4-styrene sulfonate (red) as cation and anion moiety, respectively (Figure). The cation gel, which was composed of styrene, divinylbenzene, and 4-vinylpyridine (95/5/5, mol/mol/mol), showed about 0.26 MPa as a fracture stress by the compressive test. This result is higher than that the neutral gel (0.08 MPa), which was composed of styrene and divinylbenzene (95/5, mol/mol). On the other hand, the swelling ratio of the cation gel (2.6) showed smaller than that of the neutral gel (3.4). This result suggests that the low solubility of cation moiety influenced on the network density and mechanical strengths. We will also demonstrate the organogel assemblies in aqueous media by the electrostatic interaction of the gel surfaces.


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