Network maintenance is scheduled for October 8th-9th from 10:00 PM to 2:00 AM CDT. Brief service interruptions are expected.
A brief note about your search: All of the results matching your search query require you to be a member of the UNT Community (you must be on campus or login with university credentials for access).
Mechanical behavior and performance of injection molded semi-crystalline polymers.

Mechanical behavior and performance of injection molded semi-crystalline polymers.

Access: Use of this item is restricted to the UNT Community.
Date: August 2003
Creator: Simoes, Ricardo J. F.
Description: I have used computer simulations to investigate the behavior of polymeric materials at the molecular level. The simulations were performed using the molecular dynamics method with Lennard-Jones potentials defining the interactions between particles in the system. Significant effort was put into the creation of realistic materials on the computer. For this purpose, an algorithm was developed based on the step-wise polymerization process. The resulting computer-generated materials (CGMs) exhibit several features of real materials, such as molecular weight distribution and presence of chain entanglements. The effect of the addition of a liquid crystalline (LC) phase to the flexible matrix was also studied. The concentration and distribution of the second phase (2P) were found to influence the mechanical and tribological properties of the CGMs. The size of the 2P agglomerates was found to have negligible influence on the properties within the studied range. Moreover, although the 2P reinforcement increases the modulus, it favors crack formation and propagation. Regions of high LC concentration exhibit high probability of becoming part of the crack propagation path. Simulations of the tensile deformation under a uniaxial force have shown that the molecular deformation mechanisms developing in the material depend on several variables, such as the magnitude of ...
Contributing Partner: UNT Libraries