ISSN:
0021-8995
Keywords:
Chemistry
;
Polymer and Materials Science
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Chemistry and Pharmacology
,
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
,
Physics
Notes:
An investigation was made into the effect of coupling agents on the rheological behavior and processability of polypropylene. For the study, each of the following three commercially available coupling agents, a titanate coupling agent (Kenrich Petrochemicals, KR-TTS) and two silane coupling agents (Union Carbide, A1100 and Y9187), was melt-blended with polypropylene (PP). Melt blending was performed using a twin-screw compounding machine. It was found that the zero-shear viscosity of polypropylene was decreased by 1 order of magnitude after it had been extruded through the twin-screw compounding machine and that, when coupling agents were added to it, its viscosity was higher than that of the PP without the coupling agents, undergoing the same deformation history through the twin-screw compounding machine. Independent measurements of the molecular weight of the materials show that the weight-average molecular weight (MW) of the extruded PP is 3.77 × 105, whereas the MW of the virgin PP (before extrusion) is 4.80 × 105, indicating that considerable molecular degradation occurred during extrusion and the MW of the PP extruded with coupling agent is greater than that of the PP extruded without coupling agent. In other words, the molecular weight measurement supports the viscosity measurements of the PP investigated with and without coupling agent. Also measured were the elongational viscosity of the PP with and without coupling agent, which was then correlated to the melt drawability of the materials investigated.
Additional Material:
17 Ill.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1002/app.1984.070290815
Permalink
