Binary frontal polymerization: A new method to produce simultaneous interpenetrating polymer networks (SINs)
✍ Scribed by John A. Pojman; William Elcan; Akhtar M. Khan; Lon Mathias
- Publisher
- John Wiley and Sons
- Year
- 1997
- Tongue
- English
- Weight
- 475 KB
- Volume
- 35
- Category
- Article
- ISSN
- 0887-624X
No coin nor oath required. For personal study only.
✦ Synopsis
We report a new method for the preparation of a simultaneous interpenetrating polymer network (SIN) using a thermal propagating front of two independent and noninterfering polymerization mechanisms. The system consists of the free radical crosslinking of triethylene glycol dimethacrylate (TGDMA) and the amine/BCla oamine curing of diglycidyl ether of bisphenol A (DGEBA). The front velocity dependence on the percentage of each monomer shows a minimum at 4570 TGDMA. Temperature profile measurements indicate that a single reaction front propagates. A colored opaque material is produced, but SEM and TEM analysis were inconclusive whether phase separation occurred. Samples as large as 5 cm in diameter were prepared with this method. We conclude that this method should be especially suited for preparing large sampIes of IPNs in which significantphase separation occurs. @