MA-g-EPDM

Some authors combined the IPN concept with the use of compatibi-lizers similar to that mentioned in Section 2. These may be a coupling agent such as epoxy-functionalized polysiloxane, polysiloxane copolymers or an organofunctional grafted polyolefin such as poly(ethylene-co-methacrylate) or MA-g-EPDM (maleic anhydride grafted EPDM) [124,125, 133]. Knaub et al. [150] studied a poly(urethane-ureas)/PDMS semi-IPN in... 

Recently, Ahmadi et al. [320] prepared EPDM/clay nanocomposites with organoclay that was intercalated with MA-grafted EPDM (MA-g-EPDM) and EPDM-clay composites with pristine clay via indirect melt intercalation method. Authors characterized the dispersion of the silicate layers in the EPDM matrix by XRD and TEM analysis methods. They showed that the particles of organoclay were completely exfoliated in EPDM matrix, and the mechanical, thermal, and chemical properties of nanocomposites were significantly improved compared with conventional composites. 

Evidence of chemical interaction between the mbbers and compatibUizers was demonstrated by extracting the blends with chloroform at room temperamre and examining both soluble and insoluble fractions with Fourier transform infrared (ETIR) spectrometry. The weight of the insoluble fraction of the compatibilized melt blend was more than that in the uncompatibilized blend indicating the formation of (EP-g-MA)-g-CR due to reaction between MA and allylic chlorine of CR. The compounds containing epoxidized EPDM additive were examined by both optical and... 

I. Aravind, P. Albert, C. Ranganathaiah, J.V. Kurian, and S. Thomas, Compatibilizing effect of EPM-g-MA in EPDM/poly(trimethylene tere-phthalate) incompatible blends. Polymer, 45(14) 4925-4937, June 2004. Y, Wang, F.B. Chen, and K.C. Wu, Twin-screw extrusion compounding of polypropylene/organoclay nanocomposites modified by maleated polypropylenes, /. Appl. Polym. Sci., 93(1) 100-112, July 2004. 

In order to vahdate and assess the feasibility of this approach of improving the oil resistance of EPDM, first a correlation between the oil resistance and the polarity of mbber products was established (Section 13.3), which was subsequently used as a guideline for the experimental studies. Since most of our experimental work is starting from EPM-g-MA, the mechanism of producing EPM-g-MA and the corresponding stmcture of EPM-g-MA that is obtained are discussed separately (Section 13.4). The main part of the overview deals with several experimental routes pursuing the preparation of modified and cross-linked EPM-g-MA and their effect on oil resistance (Section 13.5). 

Fig. 31 TEM micrographs of microdeformation in different parts of the crack-tip deformation zone at an interface between iPP containing 52 vol% EPDM modified with 15.3 wt% PP-g-MA and PA6, embedded in PMMA and stained with Ru04. Also shown are an optical image of the entire deformation zone and a schematic indicating the region from which image was taken [49]...

Seo [1997] prepared compatibilized PA blends with LCP polyesteramide (Hoechst Vectra B950) in the presence of anhydride-functionalized polyolefin. Specifically, 60 parts PA-6 was mixed with 25 parts LCP and 15 parts EPDM-g-MA in a TSE at 290°C. The blend was characterized by SEM, optical microscopy, Raman spectroscopy, mechanical properties, selective solvent extraction, and FTIR. 

PA-6 (75) / EPDM-g-MA (25) or EP-g-MA or ULDPE-g-MA TSE at 270°C / mechanical properties / SEM / rheology / comparison to SEBS-g-MA impact modifier Burgisi etal., 1997... 

PA-66 (100-80) / EPDM-g-MA (0-20) TSE / mechanical properties / SAXS / SEM / TEM / effects of rubber level and functionality / factors affecting ductile-brittle transition temperature / analysis of fracture surfaces Muratoglu et al., 1995 a, b... 

PA-6 (90) / EPDM-g-MA (10) SSE / selective solvent extraction / %N / FTIR / mechanical properties vs. MA level Borggreve and Gaymans, 1989... 

EMAA Zn salt (100-0) / EPDM-g-MA (1% MA) (0-100) / zinc oxide (10) internal mixer at 170°C / mechanical properties / DMA / ETIR / effects of multiple thermal histories Datta et al., 1996... 

The ternary polymer blends based on PP, PA6 (or PA66), and elastomers have been studied worldwide during last several decades. Many researchers tried to well understand the compatibility, morphology, and mechanical behavior of such ternary polymer blends. The blend systems studied include PP/PA66/SEBS-g-MA (1-5), PP/PA6/EPR-g-MA (3-5), PP/PA6/PP-g-MA (6), PP/PA6/EPDM-g-MA (7), and so on. Since several years, a research group has begun research work on PP/PA6/ POE-g-MA blends (8-12). 

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