Journal
JOURNAL OF POLYMER SCIENCE PART B-POLYMER PHYSICS
Volume 55, Issue 1, Pages 104-111Publisher
WILEY-BLACKWELL
DOI: 10.1002/polb.24251
Keywords
bottlebrush polymers; poly(lactic acid); small-angle neutron scattering
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Funding
- NSF Nanosystems Engineering Research Center for Nanotechnology-Enabled Water Treatment [ERC-1449500]
- Welch Foundation for Chemical Research [C-1888]
- National Science Foundation [0940902]
- US National Science Foundation [DMR-1508249]
- Div Of Chem, Bioeng, Env, & Transp Sys
- Directorate For Engineering [1336073] Funding Source: National Science Foundation
- Div Of Civil, Mechanical, & Manufact Inn
- Directorate For Engineering [1563008] Funding Source: National Science Foundation
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Bottlebrush polymers have densely tethered side chains grafted to a linear polymer backbone, resulting in stretching of both the side chains and backbone. Prior studies have reported that the side chains are only weakly stretched while the backbone is highly elongated. Here, scaling laws for the bottlebrush backbone and side chains are determined through small-angle neutron scattering analysis of a systematic series of poly(lactic acid) bottlebrush polymers synthesized via a grafting-through ring-opening polymerization. Scattering profiles are modeled with the empirical Guinier-Porod, rigid cylinder, and flexible cylinder models. Side chains are found to be only weakly stretched, with an end-to-end distance proportional to N-0.55, while the overall bottlebrush increases in size proportional to N-0.77. These results demonstrate that the bottlebrush backbone is not fully extended and that both side chains and backbone have significant conformational flexibility in solution. (c) 2016 Wiley Periodicals, Inc. J. Polym. Sci., Part B: Polym. Phys. 2017, 55, 104-111
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