期刊
JOURNAL OF BIOMEDICAL MATERIALS RESEARCH PART A
卷 73A, 期 3, 页码 339-348出版社
WILEY
DOI: 10.1002/jbm.a.30296
关键词
photopolymerization; shape memory effect; tert-butyl acrylate; diethyleneglycol diacrylate; stress and strain recovery rates
We examine the shape memory effect in polymer networks intended for biomedical, and specifically cardiovascular, applications. The polymers were synthesized by photopolymerization from a tert-butyl acrylate monomer with a diethyleneglycol diacrylate crosslinker. Three-point flexural tests were used to systematically investigate the thermomechanics of shape storage (predeformation) and shape recovery. The glass transition temperature, T-g, of the polymers was determined to be approximately 65 degrees C. The polymers show 100% strain recovery, at low and high predeformation temperatures, up to maximum strains of -80%. The polymers show a sigmoidal free strain recovery response as a function of increasing temperature at a constant heating rate. Free strain recovery was determined to depend on the temperature during predeformation; lower predeformation temperatures (T < T-g) decreased the temperature required for free strain recovery. Constrained stress recovery shows a complex evolution as a function of temperature and also depends on the temperature during predeformation. Stress recovery after low-temperature predeformation (T < T-g) shows a peak in the generated recovery stress, whereas, stress recovery after high-temperature predeformation (T > T-g) is sigmoidal. The isothermal free strain recovery rate was found to increase with increasing temperature or decreasing predeformation temperature. The thermomechanical results are discussed in light of potential biomedical applications, and a prototype device is presented. (c) 2005 Wiley Periodicals, lnc.
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