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The effect of thermal damage on the mechanical properties of polymer regrinds
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Kundu, Nikhil K. |
| Copyright Year | 1990 |
| Description | Reprocessed polymers are subjected to high processing temperatures that result in the breakdown of molecular chains and changes in the molecular structures. These phenomena are reflected in the mechanical properties of materials. Practically every regrind is seen as a new material. These experiments deal with the molding, regrinding, and reprocessing of test specimens for the study of their mechanical properties. The comparative test data from each recycled material would give students an insight of the molecular structures and property degradation. Three important rheological and mechanical properties such as melt flow, impact strength, and flexural strength are to be determined. These properties play key roles in the selection of engineering materials. The material selected for demonstration was Makrolon 3000L, a polycarbonate thermoplastic from Bayer AG. The thermal degradation due to repeated processing is reflected in the decrease in molecular weight and breakdown of molecular chains causing increase in melt flow. The Izod-impact resistance and the flexural strength deteriorate gradually. |
| File Size | 380531 |
| Page Count | 8 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_19900015047 |
| Archival Resource Key | ark:/13960/t2k69cr2g |
| Language | English |
| Publisher Date | 1990-05-01 |
| Access Restriction | Open |
| Subject Keyword | Nonmetallic Materials Molecular Structure Rheology High Temperature Molecular Chains Molecular Weight Flexing Degradation Casting Students Deterioration Impact Strength Polycarbonates Flexural Strength Reclamation Bending Damage Fracture Strength Thermoplasticity Thermal Degradation Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science |
| Content Type | Text |
| Resource Type | Article |
