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Polyethylene unit cell variations with branching

✍ Scribed by Swan, Paul R.

Book ID
104532056
Publisher
John Wiley and Sons
Year
1962
Weight
479 KB
Volume
56
Category
Article
ISSN
0022-3832

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✦ Synopsis

Abstract

It is demonstrated by accurate x‐ray diffraction measurements that a variety of types of branches will affect the dimensions of the orthorhombic unit cell of polyethylene. In particular, the random placement of methyl branches on the molecular backbone by means of copolymerization of 12 mole‐% of propylene with ethylene will expand the a dimension of the unit cell by as much as 7%, and the b dimensions about 0.5%. In addition, alkyl branches up to five carbons in length, chlorine atoms, oxidation products, and probably crosslinks will also expand the cell dimensions. A qualitative explanation of the uniform, anisotropic expansion due to random inclusion of dilating centers is presented.

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