Design of Graft Block Polymer Thermoplastics

• DOI: 10.1021/acs.macromol.6b02033
• Publication Date: 2016-12-01T18:46:53Z
• Authors: Jiuyang Zhang; Deborah K. Schnei...; Tuoqi Li; Marc A. Hillmyer; Frank S. Bates
• Keywords: Side chain; Molar mass; Backbone chain; Methyl acrylate

Graft block polymers are defined by several architectural parameters, including backbone flexibility, graft density, length, side-chain composition, and length. In this work we probe the impacts of each these parameters on phase behavior, rheological properties, mechanical performance materials. Specifically, examine two sets materials prepared from backbones different inherent flexibility. One set was poly[(n-butyl acrylate)-co-(2-hydroxyethyl acrylate)] (BxEy) copolymers; other hydroxypropyl methyl cellulose (HPMC) samples. Sequential ring-opening transesterification polymerization hydroxyl-functionalized macroinitiatiors yielded a diblock architecture containing rubbery interior semicrystalline exterior blocks tethered to flexible or rigid backbone. Good control over molar mass composition judicious choice segments enabled preparation that were either ordered disordered in melt state. former case, crystallization destroys existing order material; latter case induces new microphase separation bulk. Many structure–mechanical property relationships observed for copolymers with maintained semiflexible backbones, tendency samples remain transparent when stretched. However, interestingly, effects density length quite depending rigidity