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A study of the effect of branching on certain physical and mechanical properties of stereoregular polypropylene
Author(s) -
Huff T.,
Bushman C. J.,
Cavender J. V.
Publication year - 1964
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.1964.070080222
Subject(s) - branching (polymer chemistry) , polypropylene , materials science , polymer , copolymer , brittleness , polymer chemistry , polymer science , composite material , izod impact strength test , ultimate tensile strength
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 was found that ultimate strength properties of moderate molecular weight polymers 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.