The effect of various factors on the permeability of gases through polymer films. Part III. Properties of film prepared from modified polystyrene and PVC
The effect of various factors on the permeability of gases through polymer films.
Part III. Properties of film prepared from modified polystyrene and PVC
The effect of the modifying MBS and SAN copolymers on the permeability of air through films from moified PVC and polystyrene (PS) as well as on their UV-irradiation resistance has been investigated. It has been found that the permeability for both polymers changes after introducing 1—3% MBS or SAN. A distinct decrease of permeability has been observed for PS and an increase for PVC. The reason of these differences is probably different polarity of these two polymers and, thus, different interaction between the molecules of polymer and copolymer added. It has also been found that the presence of even small amounts of copolymers in PS or VC reduces their resistance to UV-irradiation connected with photodegradation, what is observed as a gradual increase in the permeability of air through these films during irradiation. The changes in the permeability of polystyrene films caused by addition of 1—3% of a SAN copolymer containing 1% acrylonitrile gave an evidence hat permeability measurements are a sensitive tool for detecting changes in the structure of polymers.
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