Silicone-EPDM blend

Figure 4 Cls, Ols, Si2s, and Si2p peaks of (a) unaged 50 50 silicone-EPDM blend (b) 50 50 silicone-EPDM blend aged for 9 h at 175°C (c) silicone rubber aged for 9 h at 175°C and (d) EPDM aged for 9 h at 175°C.

Kole et al. [66,67] studied a silicone-EPDM rubber blend. They enhanced the compatibility of the materials by the introduction of interactive [66] or reactive [67] functions grafted onto the two polymers. In both studies, PDMS... 

Kole S, Roy S, Bhowmick AK (1995) Influence of chemical interaction on the properties of silicone-EPDM rubber blend. Polymer 36(17) 3273-3277... 

Table 9 Contact Angle of Water and Surface Energies of EPDM, Silicone and Their 50 50 Blend...

Status of sample EPDM Silicone 50 50 blend EPDM Silicone 50 50 blend... 

As a result of its saturated polymer backbone, EPDM is more resistant to oxygen, ozone, UV and heat than the low-cost commodity polydiene rubbers, such as natural rubber (NR), polybutadiene rubber (BR) and styrene-butadiene rubber (SBR). Therefore, the main use of EPD(M) is in outdoor applications, such as automotive sealing systems, window seals and roof sheeting, and in under-the-hood applications, such as coolant hoses. The main drawback of EPDM is its poor resistance to swelling in apolar fluids such as oil, making it inferior to high-performance elastomers, such as fluoro, acrylate and silicone elastomers in that respect. Over the last decade thermoplastic vulcanisates, produced via dynamic vulcanisation of blends of polypropylene (PP) and EPDM, have been commercialised, combining thermoplastic processability with rubber elasticity [8, 9]. 

Kole S, RoyS, Bhowmick AK (1994) Interaction between silicone and EPDM rubbers through functionalization and its effect on properties of the blend. Polymer 35(16) 3423-3246... 

PEG, EVAc, EVAl, EPDM, PMMA, imidized-PMMA, SBR, PC, PSP, PI, PPE-blends, siloxanes, silicones, etc. Polylactic acid (PLA), polyglycolides, polybutyric acid or copolymers of butyric and valeric acid Kharas and Nemphos, 1992... 

There is a relatively large range of different types of rubbers that are used in different components in the food industry that can get in contact with the food. The most important of these are natural rubber (NR ds-l,4-polyisoprene), nitrile rubber (i.e., acrylonitrile-butadiene copolymer), ethylene-propylene rubber (EPR), rubbers of ethylene-propylene monomer (EPM) and EPDM, SBR, fluorocarbon rubber, silicone rubber, polybutadiene rubber (BR), polychloroprene rubber, and TPE. In addition, there is the use of rubber blends, i.e., blends of NR and N Rr with SBR [19]. 

Although the dynamically vulcanized blends such as EPDM/PP (Santoprene ) and NBR/PP (Geolast ) have sometimes been referred to in the literature as semi-lPNs, we considered them as blends of cross-linked elastomer dispersions in a thermoplastic matrix and as such treated them under the elastomer blends. There is yet another class of thermoplastic/thermoset blend system in which a minor amount of the cross-linkable monomer(s) is allowed to polymerize in the thermoplastic matrix forming a loose network. Examples of such systems are silicone semi-IPNs in thermoplastics that have been recently commercialized (Rimplast , Petrarch, div. of Hiils) (Anonymous 1983). 

The compatibUization technique has been used successfully in preparing EPDM/ polyamide and polyester blends, silicone rubber and polyamide blends, and blends of two dissimilar TPVs [25, 28-30]. 

FKMs are coextruded with lower-cost (co)polymers such as ethylene acrylic copolymer. 1 They can be modified by blending and vulcanizing with other synthetic rubbers such as silicones, EPR and EPDM, epichlorohydrin, and nitriles. Fluoroelastomers are blended with modified NBR to obtain an intermediate performance/cost balance. These blends are useful for underhood applications in environments outside the engine temperature zone such as timing chain tensioner seals. 

The miscibility of natural rubber (NR) blends is one of the most important factors when designing NR products. For instance, when the NR is miscible with a dissimilar polymer on a molecular level, we may improve the properties of NR as a function of the composition of the polymer. This is significantly different from the design for immiscible NR blends, whose properties are greatly dependent upon the morphology of the blend but less so on the composition. In most cases, NR is immiscible with non-polar synthetic rubbers, i.e. NR/butadiene rubber (BR) with high c -1,4-butadiene units, NR/styrene-butadiene rubber (SBR), NR/butyl rubber (IIR), NR/silicone rubber (q)13,i4 NR/ethylene-propylene-diene rubber (EPDM). This means it is important to find miscible NR blends and to control the morphology of the immiscible NR blends in a rational way. In this chapter, properties of NR blends are described from the viewpoint of miscibility, i.e. the miscible blend of NR/BR and the immiscible blend of NR/SBR. 

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