|About this Abstract
||2010 TMS Annual Meeting & Exhibition
||Processing Materials for Properties
||Effects of Sensitizer Length on Radiation Crosslinked Shape-Memory Polymers
||Taylor Ware, Walter Voit, Ken Gall
|On-Site Speaker (Planned)
Poly(methyl acrylate) (PMA) is blended with poly(ethylene glycol) diacrylate (PEGDA) of several molecular weights in various concentrations and exposed radiation. PEGDA sensitizes the radiation crosslinking of PMA. Minimum dosage for gelation decreases from 25.57 kGy for unblended PMA to 2.06 kGy for PMA blended with 10.00 mole% PEGDA. Increasing the length of the blended PEGDA molecule at a constant molar ratio increases the efficacy of the molecule as a radiation sensitizer as determined by the increase in gel fraction and rubbery modulus across dosages. However, at a constant weight ratio of PEGDA to PMA, shorter PEGDA chains sensitize more crosslinking because they have more reactive ends per weight fraction. Sensitized samples of PMA with PEGDA were tested for shape-memory properties and showed shape fixity of greater than 99%. Samples had a glass transition temperature near 28°C and recovered between 97% and 99% of the induced strain when strained to 50%.
||Definite: A CD-only volume