Polyisobutylene plastics

Chemical Designations - Synonyms Butene resins Polyisobutylene plastics Polyisobutylene resins Polyisobutylene waxes Chemical Formula C(CHj)2CH2. 

Poly(ethylene vinyl alcohol) and cellulose acetate are used in tire imierliner. High molecular weight polyisobutylene plasticizer (molecular weight 2,300 daltons) is used in pressure sensitive tape for roofing applications. ... 

Polymer polyisobutylene plasticizer ortho-nilrophenyloc-tylether organic salt tetraoctylammoniumbromide... 

Waterproof. Waterproofing barrier systems may be either hot- or cold-appHed. The hot-appHed generaUy involve a bituminous material such as asphalt used in conjunction with a reinforcing fabric such as roofing felt, cotton, or glass cloth. Cold-appHed can be bituminous or elastomeric materials either in Hquid or sheet form, with or without fabric reinforcement. Liquid elastomeric treatments include neoprene, polyurethanes, and blends of these or epoxies with bituminous materials. Among the commonly used precured elastomeric sheet materials are neoprene, polyisobutylene, EPDM mbber, and plasticized PVC. Polyethylene and PVC films and nonwoven plastic or glass fabric coated with bituminous materials also find use (78). Because these... 

Polyisobutylene is produced ia a range of mol wts, and has found a host of uses. The low mol wt Hquid polybutenes have appHcations as adhesives, sealants, coatings, lubricants, and plasticizers, and for the impregnation of electrical cables (7). Moderate mol wt polyisobutylene was one of the first viscosity-iadex modifiers for lubricants (8). High mol wt polyisobutylene is used to make uncured mbbery compounds, and as an impact additive for thermoplastics. 

Other polymers used in the PSA industry include synthetic polyisoprenes and polybutadienes, styrene-butadiene rubbers, butadiene-acrylonitrile rubbers, polychloroprenes, and some polyisobutylenes. With the exception of pure polyisobutylenes, these polymer backbones retain some unsaturation, which makes them susceptible to oxidation and UV degradation. The rubbers require compounding with tackifiers and, if desired, plasticizers or oils to make them tacky. To improve performance and to make them more processible, diene-based polymers are typically compounded with additional stabilizers, chemical crosslinkers, and solvents for coating. Emulsion polymerized styrene butadiene rubbers (SBRs) are a common basis for PSA formulation [121]. The tackified SBR PSAs show improved cohesive strength as the Mooney viscosity and percent bound styrene in the rubber increases. The peel performance typically is best with 24—40% bound styrene in the rubber. To increase adhesion to polar surfaces, carboxylated SBRs have been used for PSA formulation. Blends of SBR and natural rubber are commonly used to improve long-term stability of the adhesives. 

Among the many unusual properties that the arborescent architecture leads to, most notable is the discovery that block copolymers with a high MW dendritic (arborescent) polyisobutylene core and poly(para-methylstyrene) end blocks can manifest themselves either as a rubber, or as a plastic, depending on their environment (Figures 7.16 and 7.17). The behavior is thermally irreversible. 

Models, for process control, 20 687-691 Model selection, in chemometrics, 6 50-52 Model silicone networks, 22 569-570 Mode of a distribution, 18 135 Moderately toxic substances, 23 113 Moderately volatile materials, distribution ratios of, 23 213 Moderate molecular weight polyisobutylene, 4 434 Moderator, nuclear reactor, 17 569 Modem Plastics Encyclopedia, 19 543 Modem Plastics World Encyclopedia,... 

Berlin and coworkers (5,56) desired to obtain a material with an increased mechanical strength. They carried out a plasticization of bulk ami emulsion polystyrene molecular weight 80000 and 200000 respectively at 150-160° C, with polyisobutylene, butyl rubber, polychloroprene, polybutadiene, styrene rubber (SKS-30) and nitrile rubber (SKN 18 and SKN 40). The best results were obtained with the blends polystyrene-styrene rubber and polystyrene-nitrile rubber. An increase of rubber content above 20-25% was not useful, as the strength properties were lowered. An increase in the content of the polar comonomer, acrylonitrile, prevents the reaction with polystyrene and decreases the probability of macroradical combination. This feature lowers the strength, see Fig. 14. It was also observed that certain dyes acts as macroradical acceptors, due to the mobile atoms of hydrogen of halogens in the dye, AX ... 

Polychlorinated Biphenyl (PCB) Polychloropolyphenyls Polyformaldehyde Pclyisobutylene Plastics Polyisobutylene Resins Polyisobutylene Waxes Polyhethylene Polyphenyl Isocyanate Polyoxpropylene Ether, PPG Poly(Oxyethyl) Dodecyl Ether Poly(Oxyethyl) Lauryl Ether... 

L.K. Massey, "Polyisobutylene rubber," in Permeability Properties of Plastics and Elastomers A Guide to Packaging and Barrier Materials, chapter 80, p. 469. William Andrew Publishing, Norwich, NY, 2nd edition, 2003. 

M. Holgerson, Plastic Rocket Propellants , GerP 2006229 (1971) CA 74,113925(1971) [The use of Zn oxide is suggested as an oxygen source in a solid propint which is claimed can be used immediately without being mixed in vacuo to remove air bubbles. Thus, AN (60), polyisobutylene (14), lecithin (1) and Zn oxide (25%) are mixed at 70° to prepare the invented propint]... 

Standard Oil Co. claims the use of polyisobutylene as a plasticizer for polyvinyl acetate. Copolymers of isobutylene with vinyl ethers and other monomers are mentioned in several patents. For synthetic rubbers, oligomers of butadiene are claimed. Rubberlike polyolefins (10 to 50% is sufficient) are used extensively for plasticizing phenolic resins to increase impact strength. 

Bulyk. Butyl-based materials are sold in the form of preformed tapes, thermoplastic hot melts, and one-part solvent-releasing sealants. Butyl polymers are made by the copolymerization of 97-98 mol % isobutylene with 2-3% isoprene. Another butyl-based polymer, polyisobutylene, is produced by the polymerization of isobutylene. Formulations of butyl-based sealants also include plasticizer, filler, and lackifier resins. Poly butenes are common plasticizers for butyl sealants. Solvents, such as mineral spirits, are used for the one-part solvent-releasing formulations. As the solvent leaves the typical one-part butyl, the sealant hardens and loses its elastomeric ability. This limits the use of solvents to low movement applications where durability is not of high concern. 

Use Plastic demolition charges (Ref 19, pp 55-6) Composition C-4, also called Harrisite, was developed before 1950 at Picatinny Arsenal by Otroson (Ref 10) to serve as replacement for Comp C-3 which possessed some undesirable props. A semiplant method for manufg Comp C-4 was developed in 1956 by Lerner (Ref 14). This light brown putty-like substance contains RDX 91 nonexplosive plasticizer 9%, consisting of di-(2-ethylhexyl)sebacate 5.3, polyisobutylene 2.1 motor oil 1.6 parts. 

Since about 1950 polymer-bonded (or plastic-bonded) explosives (PBX) have been developed in order to reduce sensivity and to facilitate safe and easy handling. PBX also show improved processibility and mechanical properties. In such materials the crystalline explosive is embedded in a rubber-like polymeric matrix. One of the most prominent examples of a PBX is Semtex. Semtex was invented in 1966 by Stanislav Brebera, a chemist who worked for VCHZ Synthesia in Semtin (hence the name Semtex), a suburb of Pardubice in the Czech Republic. Semtex consists of varying ratios of PETN and RDX. Usually polyisobutylene is used for the polymeric matrix, and phthalic acid n-octylester is the plasticizer. Other polymer matrices which have been introduced are polyurethane, polyvinyl alcohol, PTFE (teflon), Viton, Kel-F and various polyesters. 

The calculated detonation parameters as well as the equations of state for the detonation products (EOS DP) of the explosive materials TKX-50 and MAD-X1 (and also for several of their derivatives) were obtained using the computer program EXPL05 V.6.01. These values were also calculated for standard explosive materials which are commonly used such as TNT, PETN, RDX, HMX, as well as for the more powerful explosive material CL-20 for comparison. The determination of the detonation parameters and EOS DP was conducted both for explosive materials having the maximum crystalline density, and for porous materials of up to 50 % in volume. The influence of the content of the plastic binder which was used (polyisobutylene up to 20 % in volume) on all of the investigated properties was also examined. 

Gelatinous Nitrate Containing Polyisobuty-lene-Gelled Naphthene Base. Increased plasticity of dynamite-type expls is achieved by adding 1—10% of a gel based upon naphthene oil 95 and polyisobutylene 5 parts. Lubricating oil, heat-exchange oil or petrolatum. may be substituted for the naphthene Ref J.M. Downard, USP 2537039(1951) ... 

Miscela C o PE. A plastic expl consisting of RDX and a piasticizer Miscela C2— RDX, CC plasticizer is water-resistant Miscela C3 t- RDX, Tetryl, CC plasticizer Miscela C4 — Plastic expl consisting of RDX 91 with Polyisobutylene other ingredients (Ref 31, p 263)... 

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