Journal
MACROMOLECULES
Volume 43, Issue 14, Pages 6185-6192Publisher
AMER CHEMICAL SOC
DOI: 10.1021/ma100952h
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Funding
- National Natural Science Foundation of China [20921091, 20732007, 20974118]
- Ministry of Science and Technology of China [2007CB-808001]
- Science and Technology Commission of Shanghai Municipality [09XD1405300]
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This paper reports a foldamer-based approach to modulating the thermal and mechanical properties of cross-linked n-butyl methacrylate copolymers Intramolecularly hydrogen-bonding-induced folded aromatic amide segments were designed and prepared, which reacted with a salicyaldehyde-bearing prepolymer to form cross-linked copolymers As a control, analogous aromatic cross-links incapable of forming discrete folded structures due to lack of specific mu-molecular H-bonding were also prepared and incorporated into copolymers. From the two series of cross-linked copolymers, 18 films were prepared and characterized by dynamic mechanical analysis (DMA) as well as creep/recovery experiments. We show that, compared to the control, the discrete folded cross-links substantially improve the mechanical properties of the copolymers We attribute this enhancement to the ability of the folded cross-links to reversibly reveal the hidden length on extension via dissipative cleavage of the intramolecular H-bonds
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