4- phenyl methacrylate

Besides appHcation as heat-resistant molding powders for electronic and other appHcations, DAIP copolymers have been proposed for optical apphcations. Lenses of high impact resistance contain 50% DAIP, 20% benzyl methacrylate, and larger amounts of CR-39 (59). A lens of refractive index 71- = 1.569 andlow dispersion can be cast from phenyl methacrylate, DAIP, and isopropyl peroxide (60). Lenses of better impact properties can be obtained by modifying DAIP with aHyl benzoate (61). 

The exceptionally low propagation constants of t-butyl and of phenyl methacrylate are notable. The polymerization of the former monomer was thoroughly examinedS5). At temperatures even as high as 25 °C this reaction, when performed in THF in the presence of salts depressing dissociation of ion-pairs, yields polymers of highly uniform size. The reaction is strictly first order in growing polymers and in monomer, and no... 

The other possibility is, for polymers with comblike structure, rearrangement in the pendant groups. Attending to the position of the aryl and acyl moieties relative to the backbone, it is possible to distinguish between two types of rearrangement. In polyCphenyl acrylate) [244] (307) and poly(phenyl methacrylate)... 

Another reaction which occurs readily in solid polymers is the Fries reaction which can be observed in phenyl esters, particularly in phenyl acrylate and phenyl methacrylate polymers. The course of the reaction can be followed very... 

A considerable amount of attention has also been paid to the photo-Fries rearrangement of polymer pendant groups. For example, the rearrangement of poly (phenyl acrylate) (10,11) in solution or in the solid-state, is usually incomplete and results in the formation of both the ortho and the para-hydroxyphenone rearranged products in amounts which vary with the conditions of the photolysis. A concurrent side-reaction, which we term the Fries degradation, also results in the liberation of small amounts of phenol (Scheme 2). Similar results have been obtained with poly (phenyl methacrylate) and other substituted aryl acrylates (4,9,12). 

Reactive Pendant Groups on Acrylic Backbones. Our study of the photolysis of poly (phenyl methacrylate) in dioxane confirms the results of previous workers... 

Figure 5. Infrared spectrum of poly(phenyl methacrylate) (a) unexposed...

While a maximum conversion of only approximately 25% of the polymer s repeating units can be obtained in solution, prolonged exposure times also result in a significant decrease in the molecular weight of polymer VI as some degradation also occurs with the liberation of phenol. The mechanism for this degradation is likely to resemble that proposed by Hiraoka and others (25,26) for the radiolysis of PMMA. The 13C NMR spectrum of the polymeric photoproduct shows clearly that the polymer contains a majority of unreacted starting phenyl methacrylate units with also some o-hydroxy ketone units. 

Fig. 5.3. Extinction angle % vs. shear rate q for solutions of a fraction of poly(para-tert-butyl-phenyl methacrylate) (M = 7.4 x 10e) in carbon tetrachloride according to Tsvetkov and Shtennikova (140). Concentrations are indicated near the...

Osmometric measurements were also carried out for different fractions of poly [4-(l,l,3,3-tetramethylbutyl)phenyl methacrylate] in toluene at 25°C [50], The measurements were made at five or six different concentrations and extrapolated to infinite dilution. Figure 1.6 shows the plot tt/c versus c, which agrees with classical relations [51,52]... 

Scheme 1.1 Chemical structure of poly[4-(l,l,3,3-tetramethylbutyl)phenyl methacrylate](la).

The preferential adsorption in dilute solution of poly(phenyl methacrylate) and its derivatives in tetrahydrofuran/water mixtures has been studied by differential refractometry and dialysis equilibrium [108], Relationships were found between the rigidity [Pg.32]

In order to investigate the effect of the ring substitution on preferential adsorption of water in poly(phenyl methacrylate) derivatives, it has been studied the preferential adsorption behavior of poly(2,4 - dimethylphenyl methacrylate) (2,4 - DMP), poly(2,5 - dimethylphenyl methacrylate) (2,5 - DMP) and poly(3,5 -dimethylphenyl methacrylate) (3,5 - DMP) in THF/water mixtures [109],... 

Poly(octadecyl methacrylate) Poly(phenyl methacrylate) 378/393 309 1.5706/1.7515 ... 

Poly(phenyl methacrylic esters) of p-alkoxybenzoic acids (PPhEAA) are an example of this type of polymers... 

Apart from poly(phenyl methacrylic ester)s of p-alkoxybenzoic acids (PPhEAA) (p. 165), molecules of this type include e.g. poly(p-nonyloxybenzamidostyrene) (PNOBS) ... 

CH4, CO. CO , propene. dimethyl ketene, toluene, styrene 4-phenylbutene. 4-phenyl-2-methylbutene. phenyl methacrylate, u-methylstyrene, short chain fragments... 

CO2. isobutene, ketene. formaldehyde, methanol, methyl ambient to methacrylate, phenyl methacrylate, chain fragments... 

A further important and easy method to prove the formation of a complex is thin layer chromatography. For example, the Rf-values of methylated P-CD (Me-P-CD, Rf = 0.69) and uncomplexed phenyl methacrylate (Rf = 0.92) in methanol are significantly different from the values of the complex (Rf = 0.54) [24],... 

Cp2TiCl2 has been assessed as additive that controls polymer chain growth in the polymerization of methyl methacrylate.1224 Methyl methacrylate is easily polymerized in the photopolymerization with Cp2TiCl2 in a water-methanol mixture under irradiation of a 15 W fluorescent room lamp. The polymerization proceeded heterogeneously.1225 This process in the presence of 2,2 -bipyridyl, 1,10-phenanthroline, or sparteine as the chelating reagent has been studied.1226 Similar studies on the polymerization of methacrylate monomers such as methyl methacrylate, ethyl methacrylate, phenyl methacrylate, and benzyl methacrylate at 40 °C have also been performed.1227 The results of co-polymerization of methyl methacrylate and acrylonitrile indicate that this process proceeds through a radical mechanism.1228 The mechanism of the controlled radical polymerization of styrene and methyl methacrylate in the... 

Comparison of the these makes the peak assignment unambiguous. The a-methyl group of phenyl methacrylate appears as a broad peak at 16.4 ppm, the backbone methylene group shows a sharp intense line at 44.0 ppm and the small broad quaternary carbon peak is at 54.0 ppm. The O—C aromatic... 

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