Design of Graft Block Polymer Thermoplastics

Zhang, Jiuyang; Schneiderman, Deborah K.; Li, Tuoqi; Hillmyer, Marc A.; Bates, Frank S.

doi:10.1021/acs.macromol.6b02033

Design of Graft Block Polymer Thermoplastics

Journal Article · Wed Nov 30 23:00:00 EST 2016 · Macromolecules

DOI:https://doi.org/10.1021/acs.macromol.6b02033· OSTI ID:1340733

Zhang, Jiuyang ^[1]; Schneiderman, Deborah K. ^[2]; ^[2]; ^[2]; ^[2]

Southeast Univ., Nanjing (China); Univ. of Minnesota, Minneapolis, MN (United States)
Univ. of Minnesota, Minneapolis, MN (United States)

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

View Accepted Manuscript (DOE)

Research Organization:: Argonne National Laboratory (ANL), Argonne, IL (United States). Advanced Photon Source (APS)

Sponsoring Organization:: National Science Foundation (NSF); National Natural Science Foundation of China (NNSFC); E.I. DuPont de Nemours & Co.; The Dow Chemical Company; USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: AC02-06CH11357

OSTI ID:: 1340733

Alternate ID(s):: OSTI ID: 1418560

Journal Information:: Macromolecules, Journal Name: Macromolecules Journal Issue: 23 Vol. 49; ISSN 0024-9297

Publisher:: American Chemical SocietyCopyright Statement

Country of Publication:: United States

Language:: ENGLISH

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