Amorphous polyethylene oxide , value

ESR method, it was concluded by Hori et al. that oxidation in the crystalline region is possible. As a result of studying the oxidation process, the difTusion constant of oxygen in polyethylene was obtained at various temperatures both for crystalline and amorphous regions 3134, ss). are shown in Fig. 6.1. showing that the difference in the values of diffusion constants in amorphous and crystalline regions amounts to about 10 orders of magnitude. 

The morphology of polymer blends that consist of one crystallizable component and one noncrystallizable amorphous compound has been studied in detail by several groups, with attention focused on various crystalline-amorphous combinations and compositions [48-50]. A single l -value always characterizes crystalline-amorphous blends, and is typically an intermediate value between that of the pure homopolymers the exact Tg depends on the weight fraction of the two polymers, however. Flighly crystalline polymers that have been studied in crystalline-amorphous blends include poly(e-caprolactone) (PCL), poly(phenylene oxide) (PPO), poly(ethylene oxide) (PEO), poly(butyleneterephthalate) (PBT), poly(ethyleneter-ephthalate) (PET), and high- and low-density polyethylene (HOPE and LDPE, respectively), whereas poly(vinyl chloride) (PVC) and poly(methyl methacrylate) (PMMA) are examples of amorphous polymers used for blending studies (51j. 

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