MAS polymer

The objective of recent DSM studies was to develop new EPM-based elastomers that have improved oil resistance. The idea was to develop such products by chemical modification of EPM copolymers using highly polar graft monomers, such as maleic anhydride (MA), and, optionally, by reacting these EPM-g-MA polymers with other chemicals as a way to (cross-Unk and) further enhance the polarity of the products. It is expected that the enhanced polarity will eventually lead to improved oil resistance of the final (cross-Unked) products, ft is noted that the EPM copolymers with extremely high MA graft levels as employed in this study are not commercially available. 

The DVB-linked MA polymers showed evidence of "kill" polystyrene and block copolymer arm with peak elution volumes at the same position as in the LB chromatograms. Note that in Figure 2b, the LALLS chromatogram has a shoulder on the major peak which is not observable in the DRl chromatogram this corresponds to a sign change in the slope of the log M(v) vs. v relationship. 

The second virial coefficients (A2) shown in Table I do not show significant dependence upon solvent for most of the LB samples. The only exception is K1107 which yielded an anomalously low A2 value in toluene this sample exhibited marginal solubility in toluene, and the low A 2 suggests unfavorable polymer-solvent interaction. The A2 values for MA polymers, however, are consistently lower than their LB... 

The differences in polystyrene-equivalent and absolute molecular weight for the LB and MA polymers are represented by the k values in Table 11 they demonstrate dissimilarities in hydrodynamic volume/molecular weight which are conferred by monomeric composition and polymeric backbone structure. The decrease in k from ca. 1.0-1.3 for LB materials to about 0.5 for the corresponding MA reflects the much higher... 

Which of the following agents was combined with the PVM/MA polymer to improve substantivity ... 

Heijboer J, "Mechanical Properties of Glassy Polymers, Containing Saturated Rings", PhD Thesis, Leiden, 1972. Heijboer J, Baas JMA, Van de Graaf B and Hoefnagel MA, Polymer 33 (1992) 1359. 

Escorene . [Exxon Deutsche Exxon Chem. GmbH] Polypropylene, polyethylene, EVA, or E/MA polymers for tireindusny. 

Imidization of MA-polymers CORl Plug-flow reactor Hagberg, 1992... 

In contrast to pl ma polymers, a-C H films possess a certain intrinsic absorption in the visible region and this gives than a more or less yellowish or brownish color in transmitted light (Fig. 19). This is always superimposed over the anomalous absorption when a metal is incorporated in clusters, so the colors are not so bright. In return one obtains higher thermal stability and better abrasion resistance. 

Figure 193 nm resist systems based on a combination of P(NB/MA) polymer, monomeric and oligomeric DI derivatives (R=H, OH in three component schemes and aliphatic diester moiety in hybrid resists), and PAGs. 

Acylation catalysts, typically nucleophilic amines and imines that activate caiboxylates by forming highly nucleophile-susceptible acyliminium intermediates, promote a wide variety of synthetically useful caiboxylate transformations. Many are sufiSciently water-soluble to evaluate as anhydride hydrolysis catalysts. Scheme 1 depicts a representative example of this class of reaction, the hydrolysis of a P(NB/MA) polymer matrix in aqueous base (TMAH) catalyzed by 4-(dimethylamino)pyridine (DMAP). 

Eastman Eastman Eastman DuPont Eastman MA. Polymers, A. Schulman, Ticona Wellman Eastman Albis AllledSIgnal ComAlloy DSM DuPont EMS Eastman Ferro GE Plastics M.A. Pdymers MRC RTP Ticona Wellman Albis AllledSIgnal, ComAlloy DSM DuPont EMS Eastman Ferro GE Plastics, RTP Ticona Du Peril DuPont Albis DuPont DuPont... 

Ticona ComAllov, D M Ferro RTP Wellman Ticona Ticona. Weiman Easiman Eastman Bayer Ccrp. CcmAllcv Eastman. Ferro, GE Plasiics. M A, PcivrrtefS MRC ComAloy Ferro, GE Plasdcs. MA Polymers. MRC. RTP Bayer Corp Amoco Polymers. Ticorta Amoco Polymers... 

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