Blends poly methacrylate

Jiang and Zhu (2000) and Qiu and Zhu (2001) have reported the fabrication of multilayered devices composed of stacks of compression-molded disks of alternating compositions. One type of disk is either P(SA-EG) or P[SA-co-TMAgly)-Z>-EG] and the other is a pH-sensitive, protein-loaded blend of, for example, poly(methacrylic acid) and polyethoxazoline. The release of model proteins, myoglobin, bovine serum albumin, and FITC-dextran, and compounds such as brilliant blue have been studied and pulsatile release profiles have been demonstrated (Jiang and Zhu, 2000 Qiu and Zhu, 2001). 

Poly(vinyl chloride) was also masticated with neoprene in an inert atmosphere at 145° C for 30 min (60), giving an easily flowing powder of low bulk density. Goto and coworkers (61) blended poly(vinyl chloride), poly(methyl methacrylate) and polystyrene in an open roll after investigating the degradation condition for each component to find the optimum combination of the component. 

Figure 9.7-1 Experimental cloud-point curve of the polymer blend Poly(methyl methacrylate)/Poly(styrene-co-acrylonitrile (28%AN)) as a function of pressure.

PVC with poly(butanediol-terephthalate-adipate) and 30 wt% GF Vinylchloride polymerized in the presence of PI, blended with PVC and MBA PVC with poly(methylmethacrylate-co-maleimide-co-vinyl cyanide) and styrene-cyclohexyl-maleimide-grafted butadiene PVC with imidated poly methacrylate (polyglutarimide, PGI)... 

PMMA is compatible with poly(ethylene glycol), PEG, through strong polar interactions, and is found to protect the latter against oxidation by a mechanism which appears to promote increased PMMA chain scission in proportion to the amount of polyether in the blend [Makhija et al., 1992]. Even stronger specific H-bonded interactions exist between poly(acrylic acid) or poly(methacrylic acid) and poly (vinyl alcohol), and both well-... 

Breiner T, Kreger K, Hagen R, Haeckel M, Kador L, Mueller AHE, Krame EJ, Schmidt HW. 2007. Blends of poly(methacrylate) block copol5nners with photoaddressable segments. Macromolecules 40 2100 2108. 

S. M. Ashraf, S. Ahmad, U. Riaz, M. Alam and H. O. Sharma, Miscibihty behavior of blend of polyesteramides of linseed oil and dehydrated castor oil with poly(methacrylic acid) , / App/ Polym Sci, 2007,103,1367-74. 

Blends of poly(methacrylic acid) or polystyrene with epoxidised linseed oil are prepared in solution by mechanical mixing in dimethyl sulphoxide (DMSO) or tetrahydrofuran (THF) to improve the performance of the individual components. However, blends of poly(methylacrylic acid) are not able to produce compatible systems, although different compositions (15-55 wt%) of polystyrene blends will form miscible blends. The results show an improvement in properties, including biodegradation of the miscible blends, and the systems are comparable with low density polyethylene. 

Blending methyl methacrylate-butadiene-styrene copolymer with poly(vinyl chloride) for instance was shown to decelerate the dehydrochlorination (leading to discoloration). The gel content, surface energy, and the spectroscopic characteristics of the blend was altered by the presence of the seccHid polymer [158]. In ethylene-propylene-diene rubber EPDM where the third monomer is ethylene-2-norbomene (NB), the photo-oxidation rate as measured by the accumulation of typical products such as hydroperoxides, varied linearly with the NB content [159]. The same held true for peroxide-crosslinked compounds of the same EPDM except that the linear relationship was found between the relative carbonyl absorbance on photoxidation and the amoiuit of peroxide used to crosslink the material... 

The self-concentration model by Lodge and McLeish can be also employed to describe the relaxation map of a miscible blend system. In reference Mpoukouvalas and Floudas (2008), Floudas et al. report dielectric data for the miscible blend poly (methyl methacrylate) (PMMA) and poly(ethylene oxide) (PEO) (see Fig. 12.22). As expected, with increasing concentration of PEO the relaxation rates shifts to lower temperatures. The data can be modeled by assuming the Vogel temperature To in the VFT equation (see Eq. 12.45) to be dependent on the effective concentration according to Eq. 12.57 ... 

In the production of reactor blends or copolymers a small variation of the reactor feed or process variables, like temperature and pressure, may easily lead to demixing of the copolymer solution or the blend in the reactor. In figure 4. some recent measurements on the blend Poly(Methyl Methacrylate/Poly (Styrene Acrylonitrile) (PMMA/SAN)[46] are summarized. The latter data were collected in a laser light scattering autoclave (as described under 3.1.3)... 

Blends of poly(methacrylate) Block Copolymers with Photoaddressable Segments. Macromolecules, 2007,40, 2100-2108. 

Various approaches have been undertaken for reactive compatibilization of poly-amide/ABS alloys. Maleic anhydride can be grafted to the ABS. Styrene maleic anhydride (SMA) copolymers have been employed as compatibilizers for polyamide/ABS blends. SMA and SAN copolymers are miscible when the AN and maleic anhydride (MA) contents are equal. The impact strength of these blends has been found to be sensitive to the amount and composition of the SMA copolymer. Addition of SMA to SAN/polyamide blends was found to enhance the tensile and impact properties of these blends. Imidized acrylic polymers have been used as compatibilizers for nylon-6/ABS blends. Glycidyl methacrylate and methyl methacrylate (GMA/MMA) copolymers are used as compatibilizing agents. The epoxide functionality in GMA is capable of reaction with polyamide end groups. GMA/MMA copolymers can be shown to be miscible with SAN over the range of AN content of ABS. Styrene/GMA copolymers have been reported to be used as compatibilizers for polymer pairs such as... 

A Poly(butadieneacrylonitrile) poly (butadiene) (-OH terminated) octadecylvinyl ether/maleic anhydride copolymer blend poly(vinyl stearate) poly (butadiene methacrylate) poly(l-butadiene) Generally exhibited highest sensitivity to test vapors, especially phosphonates (DMMP, DIMP) and octane... 

Chopra Divya, Vlassopoulos Dimitris, and Hatzikiriakos Savvas. Nonlinear rheological response of phase separating polymer blends Poly(styrene-co-maleic anhydride)/ poly(methyl methacrylate). J. Rheol. 44 no. 1 (2000) 27-45. 

Vlassopoulos Dimitris. Rheology of LCST polymer blends Poly(styrene-co-maleic anhy-drite)/poly(methyl methacrylate). Rheol. Acta. 35 no. 6 (1996) 556-566. 

Breiner, T., Kreger, K., Hagen, R., Hackel, M., Kador, L., Muller, A. H. E., Kramer, E. J. and Schmidt, H.-W. (2007) Blends of poly(methacrylate) block copolymers with photoaddressable polymers . Macromolecules, 40,2100-2108. 

---