Polyethylene clay composites

Polymer-Filler Composites thru In Situ Graft Copolymerization Polyethylene-Clay Composites... 

Solid state NMR measurements were applied to characterize polyethylene/ clay composite materials. The solid-state NMR measurements were used to observe both polymer matrix ( C and H) and the clay ( Si and A1). Free volume of poly(perfluorosulfonic acid)/Si02 composites were studied by Xe NMR. The free volume is heterogeneous and depends on the... 

Gaylord, N.G., Ender, H., Davis, L Jr., and Takahashi, A. (1979) Polymer-Filler Composites Thru In Situ Graji Copolymerization Polyethylene — Clay Composites, ACS Symposium Series 121 (eds C.E. Carraherjr. and M. Tsuda), American Chemical Sodety, Washington, DC, pp. 469-474. 

Carrero A, van Grieken R, Suarez I, Paredes B (2012) Development of a new synthetic method based on in situ strategies for polyethylene/clay composites. J Appl Polym Sci 126 987-997... 

NG. Gaylord, H. Ender, L. Davis, A. Takahashi, Polymer-flUer composites thru in situ graft copolymerization polyethylene-clay composites , in Modification of Polymers , CE.Carraher, M. Tsuda, Eds, ACS Symp Ser 121, Washinbton D C, 1980... 

MASTERBATCHED POLYETHYLENE-CLAY COMPOSITES PREPARED THROUGH IN SITU GRAFT COPOLYMERIZATION OF MALEIC ANHYDRIDE... 

The effect of the components and conditions of preparation on the properties of a 70/30 LDPE/clay composite is shown in Table I. The 10/90 mixture of LDEE Bakelite Polyethylene Resin DYNH-1 (Union Carbide Corp.) and Hydrite 10 clay (Georgia Kaolin Co.) was compounded at 150 C in the Brabender Plasticorder in the presence of MAH and/or t-butyl perbenzoate (tBPB). The EE-coated clay was then mixed with additional DYNH-1 LDPE at 130°C to yield a 70/30 PE/clay composite. A 30 70 PE/clay concentrate was prepared in a similar manner at 150 C and converted to a 70/30 EE/ clay composite at 130 C. The 10/90 PE/clay concentrate is an easily handled, clay-like product while the 30/70 concentrate is... 

The influence of neutral polymer polyethylene glycol and two surfactants with different charge, anionic sodium dodecylsulfate and cationic cetyltrimethylammonium bromide, on the intercalation of pre-formed Au nanoparticles into a clay matrix under ultrasonic treatment has been investigated. The polymer (surfactant) addition has been used to modify the active surface area of NaLmontmorillonite and to change the interlamellar space between the clay layers. Then, intercalated polymer (surfactant) in clay composites has been successfully replaced by Au nanoparticles under sonication. 

Ramazani, A., Tavakolzadeh, E, and Baniasadi, H. 2009. In situ polymerization of polyethylene/ clay nanocomposites using a novel clay-supported Ziegler-Natta catalyst. Polymer Composites 30 1388-1393. 

With up to 40% clay, the compatibilized polymer/clay composites exhibit lower water vapor permeability than typical unfilled polyethylene. The compatibilized composites containing the clay particles were crosslinked, with the anhydride-grafted polyethylene bonded to the clay particles and uncrosslinked polyethylene. The composites exhibited improved flexural modulus, break strength, and notched Izod impact properties. 

Poly(ethylene-co-MA), 288 grafted to polyethylene, 677 Poly[(ethylene)-g-MA], 459-462 applications, 461, 462 bentonite blends, 461 clay composites, 462 kaolin blends, 461 polypropylene blends, 461 properties, 461... 

Other filler studies include the effect of lignin particles in poly-3-hydroxy butyrate [57], PS-clay composites [58], nanosilicon particles in polyethylene-polypropylene blends [59], montmorillonitrite in polyethylene oxide [60] and starch filled polypropylene [61]. 

Keywords Montoraorillonite polyethylene nano composites, CPN, clay exfoliation, nanocomposites formulation, thermal stabihty, barrier propoerties, mechanical behaviour... 

Examples of the use of nanostructured materials for packaging applications have been given in Chaudhry et al. (2008) and references therein. One of the first market entries into the food packaging arena was polymer composites containing clay nanoparticles (montmorillonite). The natural nanolayer structure of the clay particles impart improved barrier properties to the clay-polymer composite material. Some of the polymers which have been used in these composites for production of packaging bottles and films include polyamides, polyethylene vinyl acetate, epoxy resins, nylons, and polyethylene terephthalate. 

There are two basic types of nanocomposites, in which particles are intercalated or exfoliated. In an intercalated composite the nanodispersed filler still consists of ordered structures of smaller individual particles, packed into intercalated structures. Exfoliated particles are those dispersed into practically individual units, randomly distributed in the composite. Layered silicates, such as montmorillonite clays or organoclays, can be used in nanocomposites. Because clays are hydrophilic and polyolefines are hydrophobic, it is not easy to make a nanocomposite based on polyethylene or polypropylene because of their natural incompatibility. 

The performance of wood-polyethylene composites was found to improve by an appropriate compatibilization with different MAs and the additional incorporation of organo-clay particles [47] consisting of natural mont-morillonite modified with quaternary ammonium salt. The thermal expansion coefficient and the heat of deflection values indicated that these materials displayed an improved interfacial adhesion. 

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