Various Procedures for the Developments of Highly Functional Polyolefin-based Nanocomposites
寺野稔教授，国际高分子领域知名学者，日本北陆先端科学技术大学院大学（Japan Advanced Institute of Science and Technology, JAIST）副校长，在世界聚烯烃及非均相催化剂领域享有盛誉。已发表文章150余篇，专利300余项。寺野教授负责组织多个系列的学术会议，包括International Colloquium on Heterogeneous Ziegler-Natta Catalysts、The Blue Sky Conference on Catalytic Olefin Polymerization、International Conference on the Reaction Engineering of Polyolefin (INCOREP)等。
Abstract: Polyolefins like polypropylene (PP) is the most important plastics having various daily and industrial applications because of its low production cost and excellent properties. PP-based nanocomposites will open new application areas by improving properties and functionalities. In this work, various procedures will be introduced for the improvements of following points.1) Polymer properties, 2) Stability, 3) Functionality. PP-grafted nanosilica (PP-g-SiO2) was synthesized to prepare PP nanocomposites(PP/PP-g-SiO2), which offered some improvements including high tensile strength and Young’s modulus over pristine PP and PP/SiO2 (Figure 1).The lifetime of PP and PP nanocomposites (PP/SiO2) is greatly improved by adding hyperbranched bis-MPA polyester-64-hydroxyl, generation 4(HBP) through molecular encapsulation of antioxidants (Figure 2). HBP might begrafted to SiO2 surface and highly dispersed in PP matrix.One of the other procedures to develop highly functional PP-based nanocomposites is using sol-gel reactions. For example, the impregnation of silicon alkoxide into PP using supercritical carbon dioxide (sc-CO2) and the subsequent sol-gel reaction were quite effective, as the silicon alkoxide was impregnated only into the continuous amorphous region of PP to form a filler network.From these procedures, the highly functional polyolefin-based nanocomposites were successfully developed.