International Polymer Science and Technology

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1 Page 1 of 11 SMITHERS GROUP MENU International Polymer Science and Authors Instructions for Authors Access Logged into International Polymer Science and. Click Here To Logout Back Search Search Journals Applied Polymer Composites Title: Comparative characteristics of the properties of petroleum-based and biobased EPDM rubbers Page Range: p.t/1-t/6 Author(s): Grima M A; Hough P; Taylor D; Urk M V The chemical, processing and service Cellular Polymers International Polymer Science & Polymers & Polymer Composites Polymers from Renewable Resources Progress in Rubber, Plastics & Recycling

2 Page 2 of 11 properties of Lanxess's traditional Keltan EPDM rubbers and Keltan Eco bio-based EPDM rubbers, both in pure form and in the form of composites, were compared. Keltan Eco is produced using bioethylene produced from sugar cane. The properties investigated included Mooney viscosity, chemical composition, MWD, non- Newtonian viscoelastic behaviour, thermal properties, vulcanisation properties, and service mechanical properties when used in a mix for solid motor vehicle seals. Keltan 5470 Eco was shown to be a high-quality rubber and composites based on it exhibited improved characteristics for the production of eco-friendly products. By using Keltan 5470 Eco combined with carbon black produced by tyre pyrolysis, a composite was produced that possessed vulcanisation characteristics with similar characteristics to equivalent composites produced using normal furnace black, but with significantly less carbon. 2 refs. (Article translated from Kauchuk i Rezina, no. 5, 2014, pp 8-12) Title: Radiation vulcanisation of hydrogenated nitrile butadiene rubber Page Range: p.t/7-t/10 Author(s): Mamedov S M; Garibov A A; Rzaeva S A; Yadreev F I; Sigov O V

3 Page 3 of 11 General laws were established governing the effect of gamma-irradiation on the structure and properties of various rubber compounds. The radiation vulcanisation of hydrogenated NBR was then conducted in the presence of the low molecular weight vulcanising agents hexachloro-p-xylene and 2-amino-4,6-bis(trichloromethyl)-symtriazine. Epoxy resin, carbon black and zinc oxide were introduced into the formulations to ensure satisfactory mechanical properties. Radiation vulcanisates were found to be inferior to thermal radiation vulcanisates in strength properties but superior to peroxide vulcanisates in terms of heat ageing and the action of solvents. In general, however, the level of physicomechanical properties of radiation and thermal radiation vulcanisates was similar to the level of properties of peroxide vulcanisates. This meant that the low molecular weight additives used, leading to the formation of C-C and C-S-C chemical bonds, effectively took part in the formation of the crosslink network during radiation vulcanisation. These additives also ensured effective protection of the rubber compounds against radiation ageing in the undeformed state. After irradiation, however, even protected rubber compounds were characterised by high compression set values. A marked reduction in the rate of compression set could be achieved by radiation post-curing. 19 refs. (Article translated from Kauchuk i Rezina, no. 5, 2014, pp 14-16) Title: Effect of zinc oxide on the peroxide vulcanisation of SKF-32 fluorine-containing rubber

4 Page 4 of 11 Page Range: p.t/11-t/15 Author(s): Sokolova L V; Nepomnyashchii A F; Kanauzova A A; Reznichenko S V The vulcanisation of SKF-32 fluoroelastomer with peroxides of different structure in the presence of zinc oxide was studied in order to select the most effective vulcanising agent and optimum form of peroxide for practical application. The peroxides used were bis(alpha,alpha-dimethylbenzyl) peroxide, cyclohexanone peroxide and tertbutylcumyl peroxide on a mineral support (fine colloidal silica). Use was also made of a mechanical mixture of di(tertbutylperoxyisopropyl)benzene and whiting. The vulcanising coagent used was triallyl isocyanate and zinc oxide. The cure characteristics and physicomechanical properties of the vulcanisates were investigated. The physicomechanical characteristics of unfilled vulcanisates based on SKF-32 rubber with different peroxides were only slightly dependent on the chemical nature of the peroxide. There was a clear difference in the effectiveness of crosslinking of SKF-32 rubber macromolecules only with a content of less than 0.5 parts pure peroxide. This was due to the fact that the main function of the mineral support was not only to improve the distribution of peroxide in the rubber mix but also to influence the rate of peroxide vulcanisation and the degree of crosslinking

5 Page 5 of 11 of elastomers based on SKF-32 rubber. The process of peroxide vulcanisation of SKF-32 rubber was slowed down when zinc oxide was introduced, which was manifested by a marked Payne effect. 5 refs. (Article translated from Kauchuk i Rezina, no. 5, 2014, pp 18-21) Title: High-molecular-weight modifiers with graft anhydride and imide groups: effect on the adhesion, rheological, and physicomechanical properties of rubber compounds Page Range: p.t/17-t/20 Author(s): Il'icheva E S; Khusainov A D; Cherezova E N; Gotlib E M The radical-initiated grafting modification of SKI-3 polyisoprene rubber with maleic anhydride, endic anhydride and N-methylmaleimide was carried out. It was established that the introduction of modified rubber into the composition of a rubber mix intended for coating metal cord promoted a reduction in the optimum vulcanisation time with very little effect on the vulcanisation start time. It was shown that a vulcanisate containing modified SKI-3 had a higher rubber-cord bond strength and that there was an increase in tensile strength properties of the rubber

6 Page 6 of 11 compounds and a reduction in elongation at break and tension set. 11 refs. (Article translated from Kauchuk i Rezina, no. 5, 2014, pp 22-24) Title: Relationship between the structure and properties of silane-modified urethane elastomers based on DMC polyethers Page Range: p.t/21-t/24 Author(s): Shabalina M S; Antipova E A; Khlebov G A The relationship between the structure of the molecular chain of siloxane-containing segmented PU (SSPU) oligomers and their processing characteristics was investigated, together with the physicomechanical properties of elastomers based on them. Particular attention was paid to the physicomechanical properties of cured SSPU materials as a function of the molecular weight of the soft segment and the mass fraction of the hard segments. The preparation of urethane oligomers with terminal alkoxysilane groups was carried out by two methods. In the first DMC polyether diol was reacted with isocyanatoalkoxysilane, while in the second a urethane prepolymer based on DMC polyether diol having terminal isocyanate groups was reacted with secondary

7 Page 7 of 11 aminoalkoxysilane. The results obtained for the influence of the molec.wt. of the soft segment (polyether chain) and the concentration of hard segments on the physicomechanical characteristics of elastomers made it possible to predict and alter the elastic strength properties of the latter by varying the structure of the oligomer chain of the SSPU segment. The use of low molec.wt. polyols and aminosilanes made it possible to produce binders for high-modulus sealants, while the use of high molec.wt. polyols and isocyanatosilanes made it possible to produce low-modulus structural sealants. 5 refs. (Article translated from Kauchuk i Rezina, no. 5, 2014, pp 26-29) Title: Effect of the mechanical activation of P803 carbon black on the properties of a rubber compound based on nitrile butadiene rubber Page Range: p.t/25-t/28 Author(s): Shadrinov N V; Kapitonov E A Mechanical activation of P803 carbon black was carried out on a planetary mill. Seven formulations of carbon black with different degrees of activation in nitrile rubber with a low acrylonitrile content were prepared. The plastoelastic properties of the rubber mixes

8 Page 8 of 11 and the properties of the vulcanisates were investigated. The mechanical activation, apart from breaking down the agglomerates, possibly activated the surface, which led to an increase in the strength properties. Activation of P803 for 90 seconds was shown to be optimum, making it possible to produce rubber compounds based on nitrile rubber with good physicomechanical properties, abrasive wear resistance and resistance to corrosive oil AMG refs. (Article translated from Kauchuk i Rezina, no. 5, 2014, pp 30-32) Title: Properties of siloxane rubbers modified with organobentonites Page Range: p.t/29-t/32 Author(s): Gadel'shin R N; Khakimullin Y N; Lygina T Z; Trofimova F A; Gubaidullina A M; Naumkina N I A comparison of the effectiveness of using organobentonites (OBs) in siloxane rubber compounds was made using compositions based on high molec.wt. silicone rubber SKTV-1 with 2.5 to 5.0 pph OB of grade Cloisite 15A (Southern Clay Products, USA) and its Russian analogue. The OBs were products of the interaction of sodium montmorillonite with quaternary ammonium salts of

9 Page 9 of 11 dimethyldialkylammonium chloride. Evidence was obtained for the intercalation or exfoliation of OBs in siloxane rubbers. The physicochemical properties of the rubber compounds were studied and it was shown that the introduction of OBs increased the nominal stress under 100% elongation, the tensile strength and the elasticity, with a slight reduction in elongation at break and hardness. The resistance of the rubbers to thermooxidative ageing was improved by addition of OB. 9 refs. (Article translated from Kauchuk i Rezina, no. 5, 2014, pp 34-37) Title: An investigation of the effect of low temperatures on rubber compounds Page Range: p.t/33-t/35 Author(s): Shilov I B; Fomin S V; Durnev E A; Khlebov G A; Kiroski D An investigation was carried out of the effect of low temperatures, including repeated cyclic reduction in temperature, on the properties of vulcanisates based on rubbers used in the tyre industry. The materials used were rubber mixes based on NR or SBR and on combinations of butadiene rubbers and NR and of chlorinated butyl rubber and NR. Tear strength, tensile

10 Page 10 of 11 properties and cracking were studied at room temperature and low temperatures. It was found that repeated exposure to low temperatures could lead to a change in the physicomechanical properties of vulcanisates and to the appearance of microcracks on their surface. The microcracks probably led to a reduction in the service life of articles of elastomers under cyclic exposure to low temperatures. It was possible to prevent the formation of microcracks on the surface of vulcanisates by using water absorbers in their composition. 3 refs. (Article translated from Kauchuk i Rezina, no. 5, 2014, pp 40-41) Title: Performance & safety requirements for medical rubber components Page Range: p.t/37-t/43 Author(s): Ishikawa K Examples of uses of elastomers for medical applications are given, including use of vulcanised rubber in closing puncture holes, medical device components exploiting elasticity, medical devices made entirely of rubber, and medical device components made of thermoplastic elastomers. The safety requirements of medical devices are then discussed, including safety from the risk control standpoint, chemical safety and,

11 Page 11 of 11 in greater detail, biological safety. Tabulated information is presented on risk minimisation techniques, on biological safety tests which should be considered, and on the composition of ISO Series (Biological evaluation of medical devices). (Article translated from Nippon Gomu Kyokaishi, no. 10, 2014, pp ) Products Services 2015 Smithers Rapra Cookies Sitemap %>