Polyethylene co-methacrylic Acid

Pyrolysis of poly(ethylene-co-methacrylic acid) (10% wt. methacrylic acid), CAS 25053-53-6, also is dominated by the pyrolysis products of polyethylene. The pyrogram of this copolymer obtained at 600° C in He with separation of a Carbowax column is given in Figure 6.1.10, and for comparison, the pyrogram for polyethylene is shown in the same... 

Figure 6.1.10. Pyrogram of poly(ethylene-co-methacrylic acid) 10% wt. methacrylic acid (upper trace) and of high-density polyethylene (lower trace). Pyrolysis done on 0.4 mg material at 60(f C in He, with the separation on a Carbowax type column.

The addition of a copolymer has been shown to be a method of improving the mechanical properties of polyethylene/polyamide blends. One copolymer which has had particular success is poly(ethylene-co-methacrylic acid) (EMA) where the acid groups are partially neutralized by metal ions (EMA-salt). 

Because the free radical initiated graft reaction can also lead to the cross-linking of polyethylene, copolymers of ethylene and with acrylic acid (184,185), glycidyl methacrylate (184,186), methacrylic acid and 10-undecenoic acid (187-189) were synthesized to compatibilize polyethylene/polyamide blends. The poly (ethylene-co-methacrylic acid) ionomers neutralized by sodium (184) and zinc (45,118,190-192) has also used as compatibilizers. High energy irradiation, used to modify the surface of fibers or films at beginning, was also used to compatibilize the polyethylene/polyamide blends (193-196). 

FIGURE 5.59 Melt viscosity of poly(ethylene-co-methacrylic acid) and its sodium salt relative to polyethylene. 

Some physical properties of polyethylene ionomers are compared with those of polyethylene and the acid copolymer, poly(ethylene-co-methacrylic acid) in Table 5.15. lonomer is generally tougher and, as shown in Table 5.15, relative to the acid copolymer, its tensile strength is increased by 27—53% and its stiffness is nearly tripled. 

R. K. Shah, R. K. Krishnaswamy, S. Takahashi, and D. R. Paul. Blown films of nanocomposites prepared from low density polyethylene and a sodium ionomer of poly(ethylene-co-methacrylic acid). Polymer, 47 (2006),... 

Poly (ethylene oxide) macromonomers72 761 are made in a similar way, as the alkoxide end group is reactive enough towards benzylic halides. With methacryloyl chloride, side reactions are involved. It is better to first protonate the PEO, and then to have it react with methacryloyl chloride in the presence of some triethyl amine. One can also react co-hydroxy polyethylene oxide) with methacryloyl imidazole, or with methacrylic acid in the presence of dicyclohexyl carbodiimide (DCCf)77). 

S. Djellali, N. Haddaoui, T. Sadoun, A. Bergeret, Y. Grohens, Stmctural, morphological and mechanical characteristics of polyethylene, poly(lactic acid) and poly(ethylene-co-glycidyl methacrylate) blends. Iran. Polym. J. 22, 245-257 (2013)... 

A handful of drugs have been studied in DES, such a paclitaxel, sirolimus, and its related family members (zotarolimus, biolimus A9, and everolimus). Many polymeric materials such as polylactic acid (PLA), polyethylene-co-vinyl acetate (PEVA), poly(styrene-b-isobutylene-b-styrene) (SIBBS), poly-L-lactic acid (PLLA), phosphorylcholine (PC), and poly-n-butyl methacrylate (PBMA), were used for drug coatings, all of which are unique to each class of DES. 

Orientations in elongated mbbers are sometimes regular to the extent that there is local crystallization of individual chain segments (e.g., in natural rubber). X-ray diffraction patterns of such samples are very similar to those obtained from stretched fibers. The following synthetic polymers are of technical relevance as mbbers poly(acrylic ester)s, polybutadienes, polyisoprenes, polychloroprenes, butadiene/styrene copolymers, styrene/butadiene/styrene tri-block-copolymers (also hydrogenated), butadiene/acrylonitrile copolymers (also hydrogenated), ethylene/propylene co- and terpolymers (with non-conjugated dienes (e.g., ethylidene norbomene)), ethylene/vinyl acetate copolymers, ethyl-ene/methacrylic acid copolymers (ionomers), polyisobutylene (and copolymers with isoprene), chlorinated polyethylenes, chlorosulfonated polyethylenes, polyurethanes, silicones, poly(fluoro alkylene)s, poly(alkylene sulfide)s. 

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