[en] The process of saturation of high-density polyethylene and polyethylene terephthalate with suband supercritical freons and supercritical carbon dioxide was investigated for the first time. The subcritical freon R22 was shown to be absorbed by these polymers in much larger amounts compared to subcritical freon R410a, as well as supercritical R23 and carbon dioxide, which makes it promising for use in the processes of impregnation and sterilization of polymers.

[en] The composition of the gas formed during the decomposition of polyethylene and polyethylene terephthalate in steam-water plasma was calculated. The database includes thermodynamic information of 32 individual substances that can be formed from carbon, hydrogen and oxygen atoms. The calculated temperature range was chosen from 1000 to 2250 K. The conditions for achieving optimal regimes for the conversion of polymers into synthesis gas was analyzed. (paper)

[en] A wide range of infinite urethane polymer networks were prepared from poly (ethylene glycol) (PEG) and hexamethylene disocyanate (HMDI) using 1,1,1, tris (hydroxymethyl) ethane (THME) as crosslinking agent. Differential scanning calorimetry showed that the hydrate formation depends quantitatively upon the weight fraction on poly(ethylene oxide) in the gel. It has been shown that the crosslinked polyurethanes crystallize only with definite ranges of chain length between the knots. In this range with the increase of the degree of crosslinking and crystallinity on the swelling character of the polymeric materials has also been discussed. (author)

[en] Highlights: • The levels of chlorinated paraffins in domestic polymeric products in China were investigated. • C₁₁Cl₆ and C₁₁Cl₇ were the dominant homologues in SCCPs, C₁₄Cl₇ and C₁₄Cl₈ were the dominant homologues in MCCPs. • The highest concentrations of chlorinated paraffins were found in a PVC cable sheath. • Domestic polymeric products might be a significant source to the environment and human exposure. Chlorinated paraffins (CPs) are widely used in domestic polymeric products as plasticizers and fire retardants. In this study, concentrations and congener profiles of short-chain and medium-chain chlorinated paraffins (SCCPs and MCCPs) were investigated in domestic polymeric products, including plastics, rubber and food packaging in China. The average concentrations of SCCPs in polyethylene terephthalate (PET), polypropylene (PP), polyethylene (PE) and food packaging were 234, 3968, 150 and 188 ng/g, respectively and the corresponding average concentrations of MCCPs in these samples were 37.4, 2537, 208 and 644 ng/g, respectively. The concentrations of CPs in rubber and polyvinylchloride (PVC) were significantly higher than in other matrices. The highest concentrations of SCCPs and MCCPs were found in a PVC cable sheath with 191 mg/g and 145 mg/g, respectively. Congener group profiles analysis indicated C₁₁- and C₁₃-congener groups were predominant in carbon homologues of SCCPs, and C₁₄-congener groups were predominant in MCCPs. High levels of SCCPs and MCCPs in domestic polymeric products implied that they might be a significant source to the environment and human exposure.

[en] A number of important surface characteristics of polymer films made of polypropylene, polyethylene (PE), polyethylene terephthalate (PET) treated with corona discharge have been considered. It has been defined that the acquired surface properties, as a result of their treatment by corona discharge, are not constant in time. (author)

[en] Polyethylene oxide solution containing multi-walled carbon nanotubes have been electrospun onto a rotating collector to produce highly aligned arrays of electrospun nanofibers ranging in diameters from (200 – 360) nanometres. The addition of a surfactant (Triton X-100) is highly effective in dispersing carbon nanotube within an aqueous solution of polyethylene oxide and the resulting mixture can be electrospun without excessive clumping to produce nanofibers containing high loadings of nanotubes; in this case up to 5% wt thereby providing an effective route to electrically conductive nanofibres. (paper)

[en] The authors' experience with clinical use of a radiosterilized polyethylene finger joint prepared from Alkatane BPM-90 is described. The material was first tested in the laboratory for toxicity to mammalian cells, followed by tests on laboratory animals. Afterwards, it was successfully implanted to humans. (author)

[en] A comparative analysis of radio-and electro-thermoluminescence phenomena in crystallizing polymers and nano composites based on super molecular polyethylene (UHMWPE) and nano-SiO₂ is carried out. The effect of low doses of γ-radiation on the electrophysical properties (ε ', ε '', T_e) of UHMWPE/ a- SiO₂ nano composites was studied. It was found that the dispersion of nanoparticles and crystallization conditions of the composite significantly affect the ETL and RTL features. It is shown that as in the creation of nano composite UHMWPE / α- SiO₂ and y-exposure decrease the intensity of y, P -relaxation processes.

[en] In this paper we considered the behaviour of the conformational probes introduced in polymer blends. The temperatures of the secondary relaxation transitions of the binary blends of polyvinyl butyral and polyethylene glycol were determined by FTIR spectra. The assignment of the secondary relaxation transitions to the types of local molecular mobility in the blend of polymers was carried out. (paper)

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