Journal
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
Volume 119, Issue 1, Pages 537-546Publisher
SPRINGER
DOI: 10.1007/s10973-014-4106-7
Keywords
Toughened epoxy resin; DSC; Non-isothermal curing; Isothermal curing; Shape-memory property
Funding
- National High Technology Research and Development Program of China [2012AA03A205]
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A diglycidylether of propoxylated bisphenol-A with two oxypropylene units (DGEBAPO-2) was prepared, and the structure was characterized by FTIR, H-1 NMR, and ESI-MS, and a flexible curing agent 2-methyl-1,5-pentanediamine (MPDA) was used to obtain an intrinsically toughened network for potential shape-memory application. The curing kinetics of DGEBAPO-2/MPDA was systematically investigated by using both non-isothermal and isothermal DSC methods; in addition, the dynamic mechanical property, mechanical property, and shape-memory property were investigated by DMA, tensile experiment, and quantitative shape-memory evaluation method. The results showed that Sestak-Berggren model and Kamal model were able to well describe the non-isothermal curing reaction rate and isothermal curing reaction rate, respectively. Tensile test at 49 degrees C indicated that the cured DGEBAPO-2/MPDA combined a relatively large elongation at break of 95.53 +/- 2.27 % with a relatively large tensile stress of 6.33 +/- 0.11 MPa. Quantitative shape-memory evaluation revealed good shape-memory properties of cured DGEBAPO-2/MPDA with shape fixity of 98.88 +/- 0.04 % and shape recovery of 96.67 +/- 6.91 %.
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