Nitrile polymers

Hgh nitrile polymers Hgh oleic canola Hgh oleic sunflower Hgh ortho novolaks... 

Plasticizers. Monomeric (mol wt 250—450) plasticizers (qv) are predominantiy phthalate, adipate, sebacate, phosphate, or trimeUitate esters. Organic phthalate esters like dioctyl phthalate (DOP) are by far the most common plasticizers in flexible PVC. Phthalates are good general-purpose plasticizers which impart good physical and low temperature properties but lack permanence in hot or extractive service conditions and are therefore sometimes called migratory plasticizers. Polymeric plasticizers (mol wt up to 5000 or more) offer an improvement in nonmigratory permanence at a sacrifice in cost, low temperature properties, and processibiHty examples are ethylene vinyl acetate or nitrile polymers. 

St. Clair et. al. investigated a series of maleimide and nadimide terminated polyimides and developed LARC-13 [8,9]. Changing the terminal group from maleimide to nadimide, the value of the lap shear strength of a titanium lap shear joint increased from 7 to 19 MPa [9]. They also added an elastomeric component to the adhesive formulation. The introduction of 15 wt% of a rubbery component, ATBN (amine terminated butadiene nitrile polymer) and ADMS (aniline terminated polydimethyl siloxane) enhanced the adhesive properties as follows 19 MPa to 25 MPa (ATBN) titanium T-peel strength 0.2 kN/m to 1.4... 

Table IX. Dilute Solution Absorption Values for Polyethylene, Poly (vinyl Chloride), and Nitrile Polymer...

Salame, M., Transport Properties of Nitrile Polymers, Amer. Chem. Soc.,... 

Polymerisation of HCN species is also possible once the initial monomers have been formed by the reactions with nitrogen HCN polymers have been postulated in many places in the solar system, from the clouds of Jupiter and Saturn to the dark colour of the surface of comet Halley, not to mention its possible role in the formation of the prebiotic molecule adenine. Photolysis of HCN produces CN and then the formation of nitrile polymers ... 

The simplest C-C bond formation reaction is the nucleophilic displacement of a halide ion from a haloalkane by the cyanide ion. This was one of the first reactions for which the kinetics under phase-transfer catalysed conditions was investigated and patented [l-3] and is widely used [e.g. 4-12], The reaction has been the subject of a large number of patents and it is frequently used as a standard reaction for the assessment of the effectiveness of the catalyst. Although the majority of reactions are conducted under liquiddiquid two-phase conditions, it has also been conducted under solidrliquid two-phase conditions [13] but, as with many other reactions carried out under such conditions, a trace of water is necessary for optimum success. Triphase catalysis [14] and use of the preformed quaternary ammonium cyanide [e.g. 15] have also been applied to the conversion of haloalkanes into the corresponding nitriles. Polymer-bound chloroalkanes react with sodium cyanide and cyanoalkanes under phase-transfer catalytic conditions [16],... 

Absolute correlations between service performance and electrochemical measurements do not appear frequently in the literature. Based on 300 test systems. Bacon and coworkers (, correlated electrochemical resistance with exposure time. Recently, Mills ( also observed a correlation between salt fog corrosion and electrochemical resistance. We have found open circuit potential measurements to be extremely useful for the routine evaluation of high-nitrile polymer-based photocured coatings. 

All nitrile-based coatings reported in this study we e applied to Bonderite 40 coated steel (B40) panels (150-300 mg/ft zinc phosphate pretreatment The Parker Company). A commercial high nitrile polymer (Barex 210) was employed as the base resin. N-vinyI pyrrolidone (Aldrich) and gamma-butyrolactone (Aldrich) were employed as reactive diluents. 

Previous work has shown that thermally cured high nitrile polymer coatings have good thermal resistance (20). Thus, the B210/NVP photocured panels were then heated in an attempt to improve their performance. The 24 hour rust rating of these thermally treated test panels varied depending on the temperature of the treatment (Figure 2). 

In Region IV, performance again increases. Crystallographic transformations in phosphate conversion coatings at 180 C are known to adversely affect phosphate crystal adhesion (26). However, nitrile cyclization may be important at these higHer temperatures. Cyclization is believed to enhance barrier properties of high nitrile polymers (27,28.29). 

Fe203 and Fe304 in presence of a chloride source act as flame retardants for nitrile-containing plastics and rubbers such as acrylonitrile-butadiene-styrene copolymers.52 The activity appears to be connected with the formation of FeCl3 on combustion, but other properties of FeCl3 itself make it unsuitable for direct use. If an alkyl chloride is present iron(II) citrate may be used, and for halogen-containing nitrile polymers acetates, stearates, sulfates and carbonates are effective. 

ANs are those that contain a majority of nitrile polymers. They provide good gas barrier, chemical resistance, and low taste and odor transfer with good impact properties when modified with rubber. Extruded sheet is used extensively in food packaging and rigid packaging applications. This crystalline TP is most useful in copolymers. Its copolymer with butadiene is nitrile rubber. Acrylonitrile-butadiene copolymers with styrene (SAN) exist that are tougher than PS. It is also used as a synthetic fiber and as a chemical intermediate. 

Nitrile polymers 1.12-1.17 Good Very good Good... 

With over 30 years of operating experience, DuPont has developed know-how to increase the onstream factor of the plant. This knowhow includes the effective use of inhibitors to reduce the formation of cyanide and nitrile polymers and effective application of an antifoulant system to increase onstream time for equipment. 

Propiomazine hydrochloride has been chromatographed at an operating temperature of 22 "c. on a 2, % SE-30 Chromosorb W column and a 3 XE-60 silicone nitrile polymer on Chromosorb W column. Employing a 3% 5 E-30 Diatoport S column operated at a temperature of PliO C., it is possible to separate propiomazine hydrochloride fxom its degradation product, 2-propjpnyl phenothiazine... 

Later, in 1974, amine reactive versions of the liquid nitrile polymers (ATBN) were issued, thereby offering another way to introduce rubbery segments into a cured epoxy resin network. References are cited which provide detailed discussions of nitrile rubber, carboxylic nitrile rubber and both carboxyl- and amine-terminated nitrile liquid polymers (1-4). Table I illustrates CTBN and ATBN products structurally. Table II provides properties for typical solid carboxylic nitrile elastomers. 

Nitrile polymers used for the manufacture of adhesives generally contain 25% or more acrylonitrile, but in the base polymer the acrylonitrile content can vary from 15% to 50%. Increasing the acrylonitrile content improves the oil and plasticizer resistance and increases the polarity of the compound. However, higher levels of acrylonitrile also increase the hardness and modulus of the polymer, reducing the elasticity of the resulting polymer. Nitrile rubber can be produced by a cold (5°C) or hot (25-50°C) process, with most adhesive polymers produced by the hot process which induces more chain branching. Nitriles can be combined with other monomers in solution polymerization which increases functionality and improves compatibility with other reactive resins like acrylics, epoxies, and polyurethanes. 

Textile pigment printing, involves the printing of an insoluble coloring material on a textile fabric. The pigment, which has no affinity for the fibers of the fabric, is adhered to the fabric by a resin binder. It has been shown that a suitable pigment may serve as an UV stabilizer as such. Resin binders are acrylic copolymer binders, styrene-butadiene latex binders, or modified nitrile polymer binders. 

Gomez, 1. L. High Nitrile Polymers for Beverage Container Application, Tedmomic Publishii Company, Inc., Lancaster, 1990. 

Uses Nonstaining, nondiscoloring antioxidant, stabilizer for SBR and nitrile polymers, latex, general purpose rubbers Trade Name Synonyms Wingstay C [Goodyear http //www.goodyearchemicai.com-, R.T. Vanderbilt http //www.rtvanderbilt.com]... 

Takahashi T, Kato H, Ma SP, Sasaki T, Sakurai K. Morphology of a wholly ether nitrile. Polymer 1995 36(20) 3803-8. 

Thermal degradation of nitrile polymers, particularly acrylonitrile, was studied in detail [472-478], It was shown that there can be two paths of degradation, depending upon the temperature (see also Chap. 8). One reaction takes place at a low temperature, between 100 and 200°C, and the... 

A promising approach toward reducing flammability of polymer systems is to alter the condensed-phase chemistry at elevated temperatures. Structure modification can alter the decomposition chemistry to favour transformation of the polymer to a char residue. Such an increase occurs when thermally induced stable crosslinking structures and/or aromatic rings are produced. Work by the Brooklyn Polytechnic in New York has examined systems such as polystyrene, aramids, PF resins and nitrile polymers such as SAN. 

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