Methacrylates fluorine containing

Due to good optical and rheological characteristics, homopolymers of fluorine-containing methacrylates and their copolymers with other methacrylates are more often used in fibre-optic practice [2, 20-24, 26-34]. But selection of a polymer with the best optical and mechanical properties requires establishment of the dependence of the structure and properties of the polymers on the structure and reactivity of initial monomers. To solve this problem the study of the kinetics of block polymerisation and copolymerisation process of fluoroalkyl-(meth)acrylates is desirable. 

Relative Activity of Fluorine-containing Methacrylates in Bulk Radical Polymerisation with Vinyl Monomers Structure and Compositional Inhomogeneity of the Macrochain Copolymers Obtained... 

Influence of the structure on the reactivity of fluorine-containing methacrylates in the bulk radical copolymerisation with vinyl monomers, as well as the dependence of structure of macromolecular chain of copolymers obtained on these factors is not well-studied [3]. 

As mentioned previously, special attention has been paid to optical polymeric materials obtained by radical copolymerisation of fluorine-containing methacrylates in mixture with various vinyl monomers [3]. Study of kinetics and mechanism of this reaction over a wide range of degrees of reaction remains one of the main problems of chemistry of polymerisational polymers as a whole, and synthesis of copolymers for optical purposes based on alkyl methacrylates, in particular. On the one hand, there is an increased interest in the studies of the mechanism during the initial stages of the radical copolymerisation [65, 66], and on the other hand, the processes occurring in specific comonomeric pairs, for the point of view of those which display the gel-effect and lead to systems with excellent optical characteristics [1,3]. 

Radical Polymerisation of Fluorine-containing Methacrylates in the Presence of Nitroxyi Radicals... 

Surface modification (54) of epoxy resin has also been made with fluorine containing methacrylic ester copolymers for the purpose of improving oil and water repellancy. ESCA analysis indicates that the fluorine is concentrated at the surface of the resin and this result is confirmed ly measurement of sur ce energy which is known to be reduced by the presence of fluorine. The peel strength of a pressure sensitive silicone adhesive was also reduced by surface modification with fluorene. DGEBA cured with bis(para-amino cyclohexyl) methane was employed for this study. 

Block and graft copolymers were prepared by Akutin, Parlashke-vich, Kogan, Kalinina, and Menes (128) by the use of ultrasonics on solutions of fluorine containing polymers or polysiloxanes on one hand and polymethyl methacrylate, polyvinyl chloride, ethylcellulose on the other. 

II. Elementorganic polymers and copolymers copolymers of fluorinated olefins [10-21] poly(perfluoroalkyl- methacrylates) and perfluoroalkylmethacrylates copolymers [1-3, 22-34] poly(organosiloxanes) [25, 35] fluorine-containing poly(organo siloxanes) [36] fluorine-containing copolymers with side functional (hydroxy) groups [37, 38], and others [1]. 

Table 8.8 Copolymerisation constants and activity factors at copolymerisation of fluorine-oxygen containing methacrylates (MJ with MMA (M2) [73] ...

Table 8.9 Methacrylates of fluorine-containing alcohols (CH2=C(CH3)COOR) for reflecting layers of polymeric waveguides ...

Structure, length of hydrocarbon chain, location [26] and amount of fluorine atoms in fluoroalkyl radical significantly affect properties of appropriate methacrylic polymer (see Table 8.9). Increasing the content of fluorine atoms in the polymer, increases the chemoresistance, thermo- and heat resistance and water absorption decreases. It should be noted that the fluorine atom in the ro-position in fluoroalkyl radical leads to a decrease of the surface tension, which is also the the reason for poor adhesion of the fluorine-containing polymer to the core and water absorption. In the a-position, the heat resistance and other properties of polymers obtained on this basis are presented in Table 8.10 [25]. 

The list of fluorine-containing carbochain polymers [24,49,73, 84, 85] can be broadened by synthesising new fluoroalkyl methacrylates with a nontraditional structure of alcohol... 

As can be clearly seen in Figs 3 and 4 the relative fluorine content or the D ] [C] ratio depends on the phase which was in contact with the copolymer film. Fluorine-containing groups are concentrated on the side which was in contact with the air. In the case of sample 11b nearly twice the fluorine content was found (Table 4). For the methyl methacrylate copolymer (sample 21b) this behavior was even more pronounced (Table 5). 

Akutin and co-workers [159] made block and graft copolymer of fluorine-containing polymers or polysiloxanes as one component and poly(methyl methacrylate), poly(vinyl chloride), and ethylcellulose as the second. During the irradiation, samples were withdrawn at regular intervals in order to determine the extent of reaction by the decrease in solution viscosity, rj. In other cases, a recombination of macroradicals into new polymeric species caused an increase in the viscosity. The sign and rate of change of rj was thus different for different systems. 

Using as starting material five fluorinated diols, Maruno et al. [33] reported the synthesis of fluorine-containing epoxy acrylate resins and epoxy methacrylate resins by the two reactions paths shown in Scheme 3. These resins are suitable as... 

Fluorinated copolymers of pyridine and non-fluorinated copolymer containing methacrylic acid Hydrogen bonding interactions [105]... 

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