Journal of Polymer Science Part A: Polymer Chemistry
Baris Kiskan, Yusuf Yagci
In this work, a self-healing strategy for poly(propylene oxide)s bearing coumarine-benzoxazine units (PPO-CouBenz)s based on light induced coumarine dimerization reactions is described. Four different types of poly(propylene oxide) amines with molecular wieghts ranging from 440 to 5000 Da were reacted with formaldehyde and 4-methyl-7-hydroxycoumarin to yield desired (PPO-CouBenz)s. The crosslinked polymer films were prepared by solvent casting of various compositions of PPO-CouBenzs in chloroform followed by thermal ring opening reaction of benzoxazine groups at 210-240 °C. Thermal curing and thermal stability of the initial PPOs and final products were investigated. By employing allyl benzoxazine in the formulation, it was demonstrated that the toughness of the films were improved. Photoinduced healing of coumarin based cured PPO-CouBenz polymer films was investigated.