A study of the effect of branching on certain physical and mechanical properties of stereoregular polypropylene

✍ Scribed by T. Huff; C. J. Bushman; J. V. Cavender

• Publisher: John Wiley and Sons
• Year: 1964
• Tongue: English
• Weight: 602 KB
• Volume: 8
• Category: Article
• ISSN: 0021-8995
• DOI: 10.1002/app.1964.070080222

✦ Synopsis

The properties of stereoregular polypropylene have been modified by the introduction of controlled branching into the polymer chain backbone. Branching is achieved by copolymerizing propylene with certain long-chain 1-olefins by using a standard Ziegler-Natta low pressure catalyst. Physical and mechanical properties of the copolymers are related to the degree and length of branching. It wa3 found that ultimate strength properties of moderate molecular weight pol-ymers could be improved at some expense in short-range deformation properties by adjusting the degree of branching to a suitable level. The copolymers did not show a good combination of low temperature brittleness characteristics along with higher temperature strength properties. It is suggested that the branching technique described will allow the tailoring of polypropylene resins for specific end use applications.