VINYL PYRIDINE COPOLYMER

The acid/base interaction between the two polymers significantly increases the cohesive strength of the polymer blend at normal use temperatures but at elevated temperature the interaction can be interrupted and the polymer can still be melt processed. Other examples of basic polymers use for crosslinking include polyethylenimines, vinyl pyridine copolymers, and the like. 

Mixing of the crystalline ingredients of oxidant, fuel elastomer binder (butadiene-2-methyl-5 vinyl-pyridine copolymer plasticized with the formal of diethylene glycol monobutyl ether) 26% by vol is done in a sigma blade mixer. The completed mix is blocked in a hydraulic press to form a chge suitable for extrusion. The extruded strand is cut into grain blanks which are cured at... 

VCap vinyl pyridine copolymers Polyoxyalkylenediamines as synergists for VCap polymers Hybranes... 

The formation of coagulum is observed in all types of emulsion polymers (i) synthetic rubber latexes such as butadiene-styrene, acrylonitrile-butadiene, and butadiene-styrene-vinyl pyridine copolymers as well as polybutadiene, polychloroprene, and polyisoprene (ii) coatings latexes such as styrene-butadiene, acrylate ester, vinyl acetate, vinyl chloride, and ethylene copolymers (iii) plastisol resins such as polyvinyl chloride (iv) specialty latexes such as polyethylene, polytetrafluoroethylene, and other fluorinated polymers (v) inverse latexes of polyacrylamide and other water-soluble polymers prepared by inverse emulsion polymerization. There are no major latex classes produced by emulsion polymerization that are completely free of coagulum formation during or after polymerization. 

Ma L, Kang HL, Liu RG, Huang Y (2010) Smart assembly behaviors of hydroxypropyl-cellulose-grq/i -poly(4-vinyl pyridine) copolymers in aqueous solution by thermo and pH stimuli. Langmuir 26 18519-18525... 

F. Jiang, A. Kaltbeitzel, B. Fassbender, G. Brunklaus, H. Pu, W.H. Meyer, H.W. Spiess, G. Wegner, Effect ofpolymer composition and water content on proton conductivity in vinyl benzyl phosphonic acid-4-vinyl pyridine copolymers, Macromol. Chem. Phys. 209 (2008) 2494-2503. 

Butadiene-vinyl pyridine copolymers (c. 75% butadiene-25% vinyl pyridine) have been extensively studied. The rubbers have a low compatibility with other diene rubbers and have an extremely high rate of cure whilst the vulcanizates tend to become hard and brittle on heating. Although tyres showed good wear resistance, early tyre failure was noted because of body breaks and tread separation whilst the polymers became excessively hard and brittle during tyre running. For this reason they have not become successful as general purpose rubbers which depend so much on outlets in the tyre industry. 

Dispersions of copolymers of butadiene with acrylic acid or methacrylic acid in aqueous potassium hydroxide have been mentioned in the patent literature" as a dip for adhering rayon tire cord to rubber. The effect is most evident when carboxyl groups are present in the adhesive, the tie cement, and the cover stocks. The adhesive may be applied as latex, aqueous dispersion, or cement. A patent issued to the Dunlop Company Ltd." describes the use of a styrene-butadiene-itaconic acid copolymer with Gen-Tac Latex (GenCorp) in formulating an RFL (resorcinol formaldehyde latex) type adhesive for bonding a natural rubber compound to Nylon 66 and rayon tire cords. Brodnyan" also claims carboxylic adhesives for rayon, nylon, and Dacron cords. In this case, the tire cords were treated with a mixed polymer latex containing resorcinol-formaldehyde condensate, a butadiene-vinyl pyridine copolymer, an SBR copolymer, and a multifunctional copolymer from methyl acrylate, 2-hydroxy propyl methacrylate, and acrylic acid. A different approach was reported by Badenkov" whereby rayon or nylon tire cords were coated with... 

Characterisation studies have been carried out on the following polymers. Low density polyethylene [60], high density polyethylene [60, 61], t-butyl methacrylate-4-vinyl pyridine copolymer [62], styrene butadiene copolymer [63], PS [64-70], polyethylene oxide [64], polypropylene oxide [71, 72], glycidyl methacrylate [73],... 

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