Thermal curing reactions of p-tert-butylcalix[n]arenes (Cn: n = 4, 6, and 8) with 1,3-phenylenebis(2-oxazoline) (PBO) were conducted, and the obtained thermosets were characterized. The dynamic mechanical analyses of the thermosets revealed that the glass transition temperature (Tg) increased in the following order: C4/PBO < C8/PBO < C6/PBO. Meanwhile, model reactions indicated that the crosslinking degree increased as the ring size of the calixarene increased. The highest Tg of the C6/PBO thermoset was due to the moderate reactivity and rigidity of the cyclic structure of C6.
- Morio Yonekawa
- Hajime Kimura
- Tomohiro Shimokawaji