Polymethyl acrylate PMA

Since alpha substituents also impede segmental motion, PMMA (Tg = 378 K) has a higher Tg than polymethyl acrylate (PMA) (7 = 279 K). The various factors which affect Tg values are additive. 

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. 

Polyvinyl fluoride/PMMA or PEMA or polymethyl acrylate (PMA) or polyethylene acrylate (PEA)... 

To illustrate the influence of the carbonyl group on the solubility of the polymer in carbon dioxide. Figure 21.3 shows the difference in doud-point pressures for polymethyl acrylate (PMA) and polyvinyl acetate (PVA) [17]. Structurally, these polymers are very similar, but the carbonyl group in PVA is more easily accessible to CO2, making it more susceptible to complex formation. As a result, the cloud-... 

The first example of this type of activation was the mechanochemical generation of an acid, developed by Diesendruck et al. Inspired by Craig s gDHC system, they incorporated gm-dichlorotetrahydro cyclopropanated indene into polymethyl acrylate matrix (PMA) and showed that compression resulted in ring-opening of... 

Content of Si02 = 3.31 vol%. PBA = polybutyl acrylate. PVAc = polyvinyl acetate. PEA polyethyl acrylate. PMA = polymethyl acrylate... 

Block copolymers of vinyl acetate with acrylates are obtained by sequentially growing the acrylate block on (TMP)Co using AIBN as a radical source, removing the acrylate monomer and then adding vinyl acetate to grow the PVAc block. GPC traces for the polymethyl acrylate block attached with (TMP)Co ((TMP)Co-PMA) and the subsequent block copolymer with vinyl acetate ((TMP)Co-PVAc-Z)-PMA) are shown in Figure 5.18. Tailing of the... 

GPC traces showing formation of a polymethyl acrylate polyvinyl acetate block copolymer (PMA-6-PVAc) mediated by an organo-cobalt complex ((TMP)Co-P). (A) (TMP)Co-PMA block, Mn=30000, PDI (Mw/Mn) = 1.11 (B) (PMA-6-PVAc), = 85000, PDI (Mw/Mn)= 1.21. Reprinted with permission from ref. 91. Copyright 2011 American Chemical Society. 

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