Mechanical behavior and molecular orientation of polycarbonate plates prepared by press‐induced deformation

Abstract

Through a uniaxial hot compression method, polycarbonate (PC) plates were self-reinforced effectively by press-induced deformation. Relationships between macroscopic mechanical properties including tensile, impact as well as viscoelastic properties, and microscopic status such as morphologies and orientation were obtained in deformed PC plates. Results showed that PC plates which were compressed at appropriate temperatures (20 C-120 C) obtained simultaneous enhancements in tensile strength (28%), elastic modulus (38%) and impact strength (700%), compared with the original plate. The impact fracture morphologies of deformed PC plates revealed evident ductile breakage. Wide-angle X-ray diffraction investigations were conducted to attribute mechanical behavior to molecular segment orientation, which was more sensitive to temperature. Self-reinforced mechanism was proposed to analyze the high correlation between various orientations of molecular segments and corresponding mechanical performance, explained by storage and loss moduli in dynamic mechanical analysis as supplemental verification. Press-induced deformation was proved to be a potentially effective method for the self-reinforcement treatment for PC transparent products.

Mechanical Properties and Fracture Microstructure of Polycarbonate under High Strain Rate Tension

“…Sarva et al [11] used a separate Hopkinson rod to conduct dynamic tensile experiments on PC materials at room temperature and high strain rates and proposed that PC materials are pressure sensitive. Wang et al [12] studied the compressive properties of polycarbonate at different strain rates and proposed a ZWT constitutive model for describing the compression of medium strain rates. Li et al [13] used the improved split Hopkinson rod test combined with digital image correlation (DIC) to study the tensile properties of polycarbonate.…”