Abstract
The effects of polycarbonate (PC) crystals and physical and chemical interactions at the interface on the interfacial adhesion between PC and reinforcing fibers were explored. Carbon fibers (CFs) and glass fibers (GFs) with different surface functional groups were prepared as reinforcing fibers. The specimens were prepared by compositing each reinforcing fiber type with PC dissolved in tetrahydrofuran, and the interfacial adhesion was evaluated using a microdroplet test after annealing the samples at various temperatures. The Raman spectra of PC near the reinforcing fibers, molecular weight, and electron spin resonance (ESR) of PC were investigated. The results demonstrate that the π−π interactions between PC and CFs and the chemical interaction between the radicals generated in PC and the functional groups on the CF surface play key roles in the improvement of interfacial adhesion. Specifically, the detection of PC radicals by ESR, shown herein, is essential for understanding the chemical interactions.
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