VINYL SILANE COPOLYMER

Aqua-Link, Water crossUnkable ethylene-vinyl-silane copolymer, AT Plastics Inc., AT Polymers Div. 

Aquathene, Ethylene vinyl silane copolymers, Equistar Chemicals... 

Gross-Linking. A variety of PE resins, after their synthesis, can be modified by cross-linking with peroxides, hydrolysis of silane-grafted polymers, ionic bonding of chain carboxyl groups (ionomers), chlorination, graft copolymerization, hydrolysis of vinyl acetate copolymers, and other reactions. 

Trimetbyl vinyl silane [754-05-2] M 100.2, b 54.4 /744mm, 55.5 /767mm, d S(25,4) 0.6865, n D 1.3880. If the H NMR spectrum shows impurities then dissolve in Et20, wash with aq NH4CI soln, dry over CaCl2, filter, evaporate and distil at atmospheric pressure in an inert atmosphere. It is used as a copolymer and may polymerise in the presence of free radicals. It is soluble in CH2CI2. [J Org Chem 17 1379 7952.]... 

The synthesis of PDMS macromonomers with vinyl silane end-groups and their free-radical copolymerization with vinyl acetate, leading to poly(vinyl acetate)-PDMS graft copolymers, was described 346). The copolymers produced were later hydrolyzed to obtain poly(vinyl alcohol)-PDMS graft copolymers. 

Polystyrene-polydimethylsiloxane (PDMS) triblock (or multiblock) copolymers 123) can be made by hydrosilylation involving a vinyl silane terminated polystyrene and a PDMS fitted at both chain ends with Si—H groups. The former species is ob-... 

Oyane, A., Kawashita, M., Nakanishi, K, Kokubo,T., Minoda, M., Miyamoto, T. and Nakamura, T. (2003) Bonelike apatite formation on ethylene-vinyl alcohol copolymer modified with silane coupling agent and calcium silicate solutions. Biomaterials, 24, 1729-1735. 

According to the reactants, either diblock or triblock copolymers can be obtained. For instance, PEO-fc-PDMS-b-PEO triblock copolymer and PEO-PDMS diblock copolymers were prepared in high yields by hydrosilylation of a telechelic PDMS which exhibits SiH functions (Mn = 1000) with monofunctional allyl-terminated PEO with Mn = 350 and 500 and telechelic diallyl PEO (Mn = 600), respectively [123]. Their dilute solution properties were investigated. Similarly, interesting PS-b-PDMS thermoplastics have been synthesized from a polystyrene fitted at chain end with a vinyl silane function which reacts with a PDMS bearing SiH end-groups [124]. In addition, hydrosilylation has been used to prepare original copolymers from a,co-disilyl-PDMS 25 and either a,oj-diallyl-polysulfone [125] or a,oj-diallyl poly (L-lactide) (PLLA) as follows [126] ... 

Propyl trimethoxysilane 4a exhibits a much lower reaction rate than that of trimethoxy vinyl silane 4b. This is the result of a reduced electron density at the silicon atom in 4a compared to 4b bearing the vinyl groiq). In contrast, the high reactivity in die case of 5, the saturated counterpart of 3a, is not only retained, but enhanced. This can be explained by a more effective electron transfer from the ester moiety to silicon in the case of 5 compared to 3a due to the missing electron delocalization. The high hydrolysis speed found for compound 5 indicates that the high reactivity of 3a can be transferred into a polymer in the case of a copolymer synthesis. 

Grafting reaction Reaction of a monomer and a polymer to form a grafted polymer or copolymer Grafting vinyl silanes onto polyolefins for crosslinked polyolefins acrylic acids onto polyolefins for hydrophilicity maleic anhydride onto polyolefins for compatabilization... 

The linear polymers and copolymers prepared by this approach were spin-coated onto various vinyl-silanized silica materials and subsequently cross-linked employing azobis-/-butyronitrile (AIBN) to yield a poly(succinic acid)-derivatized support (Figure 2). 

Recently, it was shown that ethylene-vinyl alcohol copolymer (EVOH) fibers constituting a fabric, formed small bone-like apatite crystallites on their surfaces in an SBF, when they were modified with a silane coupling agent and a CaO—Si02 gel on their surfaces, as shown in Figure 14.1.2f [61]. The same polymer also formed bonelike apatite on its surface in an SBF, when it was modified by a titania gel on its surface, and treated in hot water around 80°C to precipitate anatase [62]. 

Some vinyl silanes were found to act feasibly as weakly interacting comonomers. Functional copolymers with ethylene and vinyl-Si(CH3)3, aUyl-Si(CH3)3,3-butenyl-Si(CH3)3, 4-pentenyl-Si(CH3)3, 5-hexenyl-Si(CH3)3 or 7-octenyl-Si(CH3)2Ph as comonomers were polymerized [23-25]. The short trialkylsilane monomers suffered from the electroific influence of sihcon, which led to poor polymerization performance. In these cases, the chain end of the S3mthesized polyethylene-co-allyl-Si (CH3)3 consisted of reactive allyhc silane groups and therefore the functionality and reactivity of these copolymers was higher than the weakly interacting trimethylsUane moiety can provide. Also it was found that the phenylene group in... 

Vinyl silane-MA copolymers and derivatives of these materials have been examined in glass container coatings.The coatings were claimed to protect the annealed glass from physical abrasion and corrosion and preserve the strength of the glass container over the use cycle. Ethylene ionomer type polymer coatings, which are more economically produced, have more adequately met this need. 

Aqueous copolymers for coatings Vinyl silanes Britain 1,584,633 1981 Dynamit Nobel... 

Copolymers of vinyl silane VTMO can also be bonded to polymer chains by copolymerization, to produce vinyl silane thylene or vinyl silane ethylene butyl acrylate. These can be processed in granular form together with the appropriate catalyst master batch in conventional extruders. They can thus be regarded as alternatives to the grafted versions above but, due to their production process, they are only available as high pressure polyethylene grades. 

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