Acrylic: polymethyl methacrylate PMMA

Acrylic These polymethyl methacrylate (PMMA) plastics have high optical clarity,... 

This molecule is a copolymer with polymethyl methacrylate (PMMA) in acrylic latex paints, where the hydrophobic PMMA is surrounded by hydrophilic polyvinyl acetate molecules. Such a suspension of a hydrophobic polymer wrapped in a hydrophilic polymer is called a latex. 

Polymethyl methacrylate (PMMA) octylacrylamide/acrylates/butyl-aminoethyl methacrylate copolymer Plexiglas... 

Most general purpose linear polymers, such as polyolefins, PS, PVC, and polymethyl methacrylate (PMMA), are not suitable for use at temperatures above 100 °C. PMMA and other polymers of 1,1-substituted vinyl monomers, such as poly-a-methylstyrene, decompose almost quantitatively to their monomers at elevated temperatures. However, the Tg and Tm values of these polymers are greater than those of polymers from 1-substituted vinyl monomers. For example, the Tg values of polymethyl acrylate (PMA) and PMMA are 276 and 381 K, respectively. 

They are atactic amorphous polymers which have good light transparency (92%) and yield transparent moldings and films. As was noted for polyalkyl acrylates, the solubility parameters decrease as the size of the alkyl groups increases. The flexibility also increases as one goes from polymethyl methacrylate (PMMA) to polyaryl methacrylate and then decreases as the size of the alkyl group is further increased. 

Chain polymerization (addition reactions) polyoxymethylene, polymethyl methacrylate (PMMA), acrylic polymers, polystyrene and styrene copolymers, water-soluble polyamide... 

The acrylic plastics use the term acryl such as polymethyl methacrylate (PMMA), polyacrylic acid, polymethacrytic acid, poly-R acrylate, poly-R methacrylate, polymethylacrylate, polyethylmethacrylate, and cyanoacrylate plastics. PMMA is the major and most important homopolymer in the series of acrylics with a sufficient high glass transition temperature to form useful products. Repeat units of the other types are used. Ethylacrylate repeat units form the major component in acrylate rubbers. PMMAs have high optical clarity, excellent weatherability, very broad color range, and hardest surface of any untreated thermoplastic. Chemical, thermal and impact properties are good to fair. Acrylics will fail in a brittle manner, independent of the temperature. They will suffer crazing when loaded at stress about halfway to the failure level. This effect is enhanced by the presence of solvents. 

Literature continues to be rather extensive on this subject since the 1930s. A summarization is provided in this section. Products fabricated include sheets, films, rods and tubes, and embedment. Acrylic castings usually consist of polymethyl methacrylate (PMMA) or copolymers of this ester as the major component with small amounts of other monomers to modify the properties (Chapter 2). Adding acrylates or higher methacrylates lowers the heat deflection temperature and hardness and improves thermoformability and solvent cementing capability, with some loss in resistance to weathering. Dimethacrylates or other crosslinking monomers increase the resistance to solvents and moisture. 

The newer type of colloidal catalysts have been prepared containing palladium (4), platinum (4), rhodium (5), and iridium (6). A variety of synthetic polymers has been applied. Among those tested were polyvinyl alcohol (PVA), polyvinyl acetate (PVAc), polymethyl methacrylate (PMMA), and polymethyl acrylate (PAMA). In general, polyvinyl alcohol (4a) has been found most satisfactory. 

Polymethyl- methacrylate PMMA, Acrylic 1.19 HB 17-20 - Fair 1.49 Good - - 0.2... 

Candidates. The only commeroially available oriented films known at this time which fit the weather resistance requirements are polyvinylidene fluoride (PVF2)i polyvinyl fluoride (Tedlar), polymethyl methacrylate (PMMA), and polybutyl aorylate/methyl methacrylate copolymer (PBA/MMA). PVF2 is currently expensive. PBA/MMA is inexpensive but in clear form does not appear to be sufficiently oxidatively stable for our purposes. It is also too water sensitive and too easily softened in many laminating processes. PMMA appears to be somewhat more chemically stable than PBA/MMA and is also relatively Inexpensive, but has the same dimensional stability problems at 150°C, the normal pottant processing temperature. Both acrylics maintain excellent optical clarity on heat aging, however. 

Asemblon, Inc. (Redmond, Washington). 11-Mercaptoundecanoic acid (MUDA) with 97% pinity, 16-mercaptohexadeconic acid (MHA) with 90% purity and 1-octadecanethiol (ODT) with 98% purity were purchased from Aldrich (St. Louis, Missouri). Polystyrene (PS) standard with 18,100 Da poly (acrylic acid) (PAA) with 2000 Da polymethyl methacrylate (PMMA) standard with 15,000 Da M , PS-PAA block copolymers and the solvents including acetonitrile, acetone, anhydrous ethanol, toluene, and N,N-dimethylformamide (DMF) were purchased from Aldrich. 

Considers ethylene methyl acrylate (EMA) copolymer toughened polymethyl methacrylate (PMMA) blends... 

Acrylics These are a versatile family of polymers, most commonly represented by polymethyl methacrylate (PMMA), or commercial names. Perspex or Plexiglass. It was developed in 1931. Its specific mass = 1.18. The chemical structure is as follows ... 

This technique has found the following applications in addition to those discussed in Sections 10.1 (resin cure studies on phenol urethane compositions) [65], 12.2 (photopolymer studies [66-68]), and 13.3 (phase transitions in PE) [66], Chapter 15 (viscoelastic and rheological properties), and Section 16.4 (heat deflection temperatures) epoxy resin-amine system [67], cured acrylate-terminated unsaturated copolymers [68], PE and PP foam [69], ethylene-propylene-diene terpolymers [70], natural rubbers [71, 72], polyester-based clear coat resins [73], polyvinyl esters and unsaturated polyester resins [74], polyimide-clay nanocomposites [75], polyether sulfone-styrene-acrylonitrile, PS-polymethyl methacrylate (PMMA) blends and PS-polytetrafluoroethylene PMMA copolymers [76], cyanate ester resin-carbon fibre composites [77], polycyanate epoxy resins [78], and styrenic copolymers [79]. 

AECI Ltd. of South Africa built a pilot plant for recycling of polymethyl methacrylate (PMMA) and using it in production of acrylic sheet. The process uses microwaves to de-polymerize PMMA through thermal decomposition, and replaces existing molten-bath recycling reactors. 

One material particularly suited to depolymerisation is polymethyl methacrylate (PMMA), more commonly known as acrylic. The route for depolymerisation is shown in Figure 8.2. To show the long history of depolymerisation technology, a process to depolymerise PMMA was developed and patented in Germany as far back as 1949 [10]. However, this method lead to the recovered material being contaminated with lead, which obviously limits application for this particular process. An alternative and more... 

Polymethyl methacrylate (PMMA) thermoplastic material with exceptional optical clarity and resistance to outdoor exposure, used in the form of cast sheets, blocks and rods, and as injection moulding and extrusion material. This acrylic... 

The most important acrylic plastic is polymethyl methacrylate (PMMA). It also was the first acrylic to be produced commercially. It is an amorphous thermoplastic polymer that can be thermoformed, molded, or extruded above 150°C. It is soluble in ketones, esters, and chlorinated hydrocarbons, but is resistant to attack by dilute acids and bases. Compared to polymethyl acrylate, PMMA is more stable to exterior aging, has lower moisture absorption, and is more resistant to alkalies. 

Polyethylene, HDPE 9 Polymethyl Methacrylate (PMMA) 5 Acrylonitrile Styrene Acrylate (ASA) 0-3... 

Dimethionine Acrylonitrile Methyl Acrylate (AMA) 0-3 Polymethyl Methacrylate (PMMA) 5... 

Acrylonitrile Styrene Acrylate (ASA) Polystyrene (PS) 4-7 5 Acetal, Copolymer (POM Copolymer) Acrylonitrile Styrene Acrylate (ASA) 9 9 Polymethyl Methacrylate (PMMA) Polymethylpentene (PMP) 5- 8 6- 8... 

Polymethyl Methacrylate (PMMA) 8-9 Acrylic 8 Linear Low Density Polyethylene (LLDPE) 5-9... 

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