Methyl methacrylate homopolymer

The initial product is essentially poly(methyl methacrylate) homopolymer. Little styrene is incorporated into copolymer chains unitl most or all of the methyl methacrylate is exhausted. Reports of significant amounts of styrene in products from anionic copolymerization of styrene-methyl methacrylate are usually artifacts of the particular reaction system, a consequence of heterogeneity of the propagating centers and/or counterion. 

In both series of copolymers, the methoxyl resonance is surprisingly complex and appears to offer the best promise of yielding fundamental information concerning the microstructure of the chains. In methyl methacrylate homopolymers, the methoxyl protons appear as a single narrow peak at 6.40t regardless of the stereochemical configuration of the chains. In the copolymers, the methoxyl resonance is evidently very, sensitive to the configuration and proximity of the... 

Effects of additives in the matrix were observed by substituting for methyl methacrylate a poly (methyl methacrylate) homopolymer with a solution molecular weight of 950,000, a vinylidene fluoride copolymer (Pennwalt s Kynar 7201), and a methacrylate-butadiene-styrene impact modifier (Marbon s Blendex BTA IIIN). Concentrations were 2% on the total dispersion volume. The same additives were studied at the same volume concentration in the dispersed phase. Barium sulfate (Whittaker, Clark, and Daniels Barytes No. 91), a commonly used additive for radiopacity, was also studied in the dispersed phase. Responses were observed by the test methods described below. 

KORAD LPT LUCITE METAPLEX NO METHACRYLIC ACID METHYL ESTER POLYMERS METHYL METHACRYLATE HOMOPOLYMER METHYL METH.ACRYLATE POLYMER METHYL METHACRYLATE RESIN 2-METHYL-2-PROPENOIC ACID METHYL ESTER HOMOPOLYMER ORGANIC GLASS E 2 OSTEOBOND SURGICAL BONE CEMENT... 

UV absorption spectra, fluorescence emission spectra and photostabilization effect of 2-(2-hydroxy-4-acryloyloxyphenyl)-2/7-benzotriazole and of its polymer bound forms were studied in poly-CK-l,4-polybutadiene [337]. The following activity series was found copolymer with methyl methacrylate > homopolymer > monomer. It seems that chromophoric units incorporated into a macromolecule behave cooperatively (causing self-absorbance of the emitted radiation). 

Figure 7. Surface pressure-area curve for mixture of dimethylsiloxane and methyl methacrylate homopolymers, 42.2% siloxane. Solid curve observed for mixed film. Dashed curve calculated for additivity of single component monolayers.

Methacrylic acid methyl ester polymers Methyl methacrylate homopolymer 2-Methyl-2-propenoic acid methyl ester... 

Synonyms Methacrylic acid methyl ester polymers Methyl methacrylate homopolymer Methyl methacrylate polymer Methyl methacrylate polymers Methyl methacrylate resin 2-Methyl-2-propenoic acid methyl ester homopolymer PMM PMMA 2-Propenoic acid, 2-methyl-, methyl ester, homopolymer... 

FIGURE 20 The LC LCD separation of polystyrene and poly(methyl methacrylate) homopolymers from the real sample of block copolymer PS-block-PMMA with help of LC LCD a) original chromatogram, b) sample spiked with PS, c) sample spiked with PMMA. The colunm packing was bare silica gel with pore size of 6 mn. Eluent was a mixture THF/toluene 70/30, barrier 1 was neat toluene, and barrier 2 was a mixture of THF with toluene 30/70. All mixed solvent compositions are in weight percent. 

Commercial acrylic resins comprise a broad array of polymers and copolymers derived from esters of acrylic acid and methacrylic acid. They range from the homopolymer of methyl methacrylate to a variety of copolymers including both the thermoplastic and thermoset type and ranging from hard and stiff types to soft and elastomeric types. The most common of the thermoplastic acrylic resins are the poly(methyl methacrylate) homopolymer (PMMA) and the copolymers containing predominantly methyl methacrylate but with small amounts of methyl or ethyl acrylate, acrylonitrile, or styrene comonomers added for improved toughness. 

Homogeneous bulk ATRP of methyl methacrylate homopolymer and block copolymers can be achieved with some success in a continuous packed-bed tubular reactor using a supported catalyst [73-75]. The metal catalyst can be adsorbed on the silica gel column packing material instead of dissolving the catalyst in the bulk of the reaction medium. Some control can be achieved, but it is not as effective as more typical reactions using soluble catalysts. This is typical of ATRP systems that use supported catalysts and is attributed to inefficient reaction of the propagating radicals with the supported deactivator [76]. Also, it has been speculated that the activation-deactivation reaction does not actually occur at the supported catalyst site, but rather occurs with a trace amount of free catalyst that is present in the system [77]. 

By contrast, the poly(methyl methacrylate) homopolymer (also shown in Figure 12.5) yields a ratio of 0.38, in good agreement with the theoretical value of 0.40. The ratio 0.28/0.38 suggests that the fracture process is more adhesive than cohesive by a ratio of about 3 1 for this polystyrene/poly(methyl methacrylate) interface. 

By combining portions of the conformational descriptions derived for styrene, methyl acrylate, and methyl methacrylate homopolymers [63-66], Koinuma etal. [67] developed an RIS model for the 1 1 alternating S-MM copolymer. When this RIS model is utilized to calculate the conformation probabilities for the bond pair flanking the styrene methine carbon in the co-hetero S-MM triad illustrated above, it is possible to calculate [62] the average intermethylene... 

Polymethyl acrylate can be hydrolysed rapidly and completely under alkaline conditions. On the other hand, the monomer units in polymethyl methacrylate prepared and treated similarly are resistant to hydrolysis [51] although benzoate end-groups react readily [52]. Only about 9% of the ester groups in polymethyl methacrylate reacted even during prolonged hydrolysis hydrolysis of polymethyl acrylate was complete in 0.5 hours. Although only about 9% of the ester groups in methyl methacrylate homopolymers are hydrolysed in several hours reflux with alcoholic sodium hydroxide, this proportion is increased by the introduction of comonomer units into the polymer chain. Thus, saponification techniques should be applied with caution to polymeric materials. 

MG 30 and MG 49 are graft copolymers containing the percentage amounts of methyl methacrylate indicated by the numbers. They are available either as latices or as solid rubbers from suppliers in Malaysia. Alternative supplies are often available from specialist manufacturers in consuming countries. Although there is always present some methyl methacrylate homopolymer, at least 50% is grafted. The latex contains 50% total solids and is easily manufactured in an adhesives factory. Table 5 gives the recipe for preparation of the latex. ... 

An amorphous emulsion copolymer consisting of 60 wt% methyl methacrylate (homopolymer Tg = 105 °C) and 40 wt% ethyl acrylate (homopolymer Tg = 23 °C) has been proposed as the basis of a latex paint formulation. A latex consists of tiny ( —10 Xm) polymer particles suspended in water. After application of the paint, these particles must coalesce to form a film upon evaporation of water. 

The initial period of 30 minutes refluxing produces some copolymer rich in MMA and the addition of the balance of the monomer mixture at a rate rqrproximating to that of the polymerisation ensures a random copolymer approximating 73% by weight of VA is formed. The use of a protective colloid (hydroxy ethyl cellulose) is partially responsible for the larger particle size compared to the methyl methacrylate homopolymer in the previous example. 

If coatings are to be applied by spray techniques some molecular weight restrictions need to be observed, especially with methyl methacrylate homopolymers. Molecular weights in the range 55,000 to 105,000 give a good balance between application, avoidance of cobwebbing and the durability of the formed fllm. ... 

Cellulose acetate butyrate (CAB) - This is often used to improve the sprayability of high molecular weight methyl methacrylate homopolymers, thus reducing the... 

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