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High-Strain Shape-Memory Polymers
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DOI：10.1002/adfm.200901409.png)
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摘要
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Shape-memory polymers (SMPs) are self-adjusting, smart materials in which shape changes can be accurately controlled at specific, tailored temperatures. In this study, the glass transition temperature (T-g) is adjusted between 28 and 55 degrees C through synthesis of copolymers of methyl acrylate (MA), methyl methacrylate (MMA), and isobornyl acrylate (IBoA). Acrylate compositions with both crosslinker densities and photoinitiator concentration optimized at fractions of a mole percent demonstrate fully recoverable strains at 807% for a T-g of 28 degrees C, at 663% for a T-g of 37 degrees C, and at 553% for a T-g of 55 degrees C. A new compound, 4,4'-di(acryloyloxy)benzil (referred to hereafter as Xini) in which both polymerizable and initiating functionalities are incorporated in the same molecule, was synthesized and polymerized into acrylate shape-memory polymers, which were thermornechanically characterized yielding fully recoverable strains above 500%. The materials synthesized in this work were compared to an industry standard thermoplastic SMP, Mitsubishi's MM5510, which showed failure strains of similar magnitude, but without full shape recovery: residual strain after a single shape-memory cycle caused large-scale disfiguration. The materials in this study are intended to enable future applications where both recoverable high-strain capacity and the ability to accurately and independently position T-g are required.
Keyword:
THERMOMECHANICAL PROPERTIES
GLASS-TRANSITION
POLYURETHANE
ACTUATION
TOUGHNESS
NETWORKS
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19
论文数:
3.5W
被引数:
32.1W
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