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Abstract
The statistical theory of solid polymers (without a solvent) is presented. Such problems as the neck formation, the α-relaxation transition, the calculation of the scale critical exponents are considered. The experimental data obtained are in excellent agreement with the theory. It is found that the dynamic properties of dilute polymer solutions in a good solvent are influenced by entanglement interactions. Therefore it is not necessary to introduce a new dynamic critical exponent. Ethylene-acrylic acids copolymers with the co-unit content ca 0.1 mol % and linear polyethylenes are studied by WAXS, SAXS, and infrared spectroscopy. Drawing and shrinkage behavior of these materials are also investigated. It is shown that the copolymer branches can be aggregated through intramolecular attraction. The entanglement concentration as revealed by SAXS and from shrinkage data is 0.07–0.08 mol % in high-oriented polyethylene.