Elastic modulus of the crystalline regions of p-hydroxybenzoic acid/poly(ethylene terephthalate) copolymers
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説明
Abstract The elastic modulus ( E l ) of the crystalline regions in the direction parallel to the chain axis was measured for p -hydroxybenzoic acid (HBA)/poly(ethylene terephthalate) (PET) copolymers by X-ray diffraction. The E l values are 59 and 105 GPa for HBA/PET 60/40 and 80/20 copolymers, respectively, which are considered to reflect the linearity of the skeletal structure of the chain molecule. The elastic modulus ( E t ) of the crystalline regions in the direction perpendicular to the chain axis was 2.1 GPa for both copolymers, which was much smaller than that of polyethylene (∼ 4 GPa, where only van der Waals forces act). Though π-electron interaction could be expected, loose and/or disordered lateral packing of the chains leads to the small E l values of these copolymers.
収録刊行物
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- Polymer
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Polymer 36 2681-2684, 1995-01-01
Elsevier BV
