Maleic grafted polyethylene

The interaction of the polymer with the filler is promoted by the presence of reactive functionality in the polymer, capable of chemical reaction or hydrogen bonding with the functionality, generally hydroxyl, on the surface of the filler. Thus, carboxyl-containing polymers, e.g. ethylene-acrylic acid copolymers and maleic anhydride- and acrylic acid-grafted polyethylene and polypropylene interact readily with fillers. 

Figure 2. Outline of the surface reactions on poly(maleic anhydride) grafted polyethylene.

However, in spite of these similarities, the adsorbed amounts and the structure of the adsorbed mucin and collagen layers on the surfaces studied are entirely different. The behavior of these proteins is analyzed here on the hydrophobic polyethylene surface (water contact angle 0 20 95°), on the surface modified polyethy-lenes oxidized polyethylene (0h q 74°) and poly(maleic acid) grafted polyethylene ( Ho0 74°) a d on the hydrophilic mica surface ( H2 0 0°) Acidic pH = 2.75 (for collagen) and slightly alkaline pH = 7.2 (for mucin) were chosen in order to minimize the association of these proteins in solution and to make possible the analysis of their adsorbabilities in comparable conditions. 

Figure 9. Desorption-adsorption relationships (a) polyethylene-collagen (a) poly(maleic acid) grafted polyethylene-collagen (o) polyethylene-mucin ) surface oxidized polyethylene-mucin. Adsorption time 20 hrs temp. 20°C. Adsorption conditions as indicated in Figure 7.

Y.-Y. Cui, B.-J. Dong, B.-L. Li, S.-C. Li, Properties of polypropylene/poly(ethylene terephthalate) thermostimulative shape memory blends reactively compatibilized by maleic anhydride grafted polyethylene-octene elastomer. Int. J. Polym. Mater. Polym. Biomater. 62, 671-677 (2013)... 

Fig. 11.10 The SEM images of a the viscose fibers and the fracture surfaces of b HOPE, c HDPE-PEgMA (maleic anhydride grafted-polyethylene), d HDPE-PEgMA-fiber (5 wt%), e HDPE-PEgMA-fiber (10 wt%), f HDPE-PEgMA-fiber (20 wt%), g HDPE-PEgMA-fiber (40 wt%), and h HDPE-fiber (40 wt%) [56]...

Liang, G., Xu, J., Bao, S., and Xu, W. 2004. Polyethylene/maleic anhydride grafted polyethylene/ organic-montmorillonite nanocomposites. I. Preparation, microstructure, and mechanical properties. Journal of Applied Polymer Science 91 3974—3980. 

Yong, L., Zhang, E, Endo, T., and Hirotsu, T. 2002. Structural characterization of maleic anhydride grafted polyethylene by i C NMR spectroscopy. Polymer 43 2591-2594. 

Lu, H. L. and Chung, T. C. 2000. Synthesis of maleic anhydride grafted polyethylene and polypropylene, with controlled molecular structure. Journal of Polymer Science, Part A Polymer Chmistry 38 1337-1343. 

Recently, Liu et al. [34] prepared banana fibre (BaF)-filled composites based on high-density polyethylene (HDPE)/polyaminde-6 (PA 6) blends via a two-step extrusion method. Maleic anhydride grafted styrene/ethylene-butylene/styrene triblock polymer (SEBS-g-MA) and maleic anhydride grafted polyethylene (PE-g-MA) were used to enhance impact performance and interfacial bonding between BaF and the resins. Mechanical, crystaUization/melting, thermal stability, water absorption and... 

Shen et al. [75] measured the electrical conductivity of polyethylene/maleic anhydride-grafted polyethylene/graphite nanocomposites. Electrical conductivity and morphology were influenced by the polymer preparation method and could be explained in terms of percolation theory. 

Low-density polyethylene/Mg - Al LDH (LDPE/LDH) nanocomposites were prepared in a tightly intermeshing co-rotating twin-screw extruder having 27 mm screw diameter and L/D ratio value of 36. In the first step, DBS-modified Mg-Al LDH (LDH-DBS) and maleic anhydride grafted polyethylene (PE-g-MAH) were compounded in the extruder in 1 1 weight ratio. The... 

POtschke P, Wallheinke K and Stutz H (1999) Blends of thermoplastic polyurethane and maleic-anhydride grafted polyethylene. I Morphology and mechanical properties,... 

Since high density polyethylene (HOPE) is relatively inert it is difficult to achieve good interfacial adhesion in composites. Often maleic anhydride grafted polyethylene is added to HOPE to improve interfacial adhesion to the reinforcing fibres [56]. 

Sailaja R R N, Chanda M (2001), Use of maleic anhydride-grafted polyethylene as compatibilizer for HDPE-tapioca starch hlends effects on mechanical properties , J. Appl. Polym. Sci., 80, 863-872. 

The influence of the inclusion size, shape, and surface treatment on the gas permeability of polyethylene in its micro- and nanocomposites has been investigated in various papers.Kato et al. report the N2 permeability of nanocomposites based on polyethylene (PE) melt compounded with maleic anhydride grafted polyethylene (MA-g-PE) and octadecylamine (C18-MMT) modified montmorillonite. The gas permeability coefficient for all the prepared samples are reported in Fig. 11.8. Interestingly, polyethylene, maleic anhydride grafted polyethylene, a 70/30 blend of PE/MA-g-PE and a blend of PE/MA-g-PE/MMT have almost the same permeability coefficient. Only the composites obtained by mixing the polymeric matrices with the modified montmorillonite show for PE/MA-g-PE/C18-MMT (PECHl) a decrement of 30% in permeability and for MA-g-PE/C18-MMT (PECH3) a decrement of 35%. The differences in the gas barrier property were attributed to the different dispersion of the clay silicate layers in the matrix. 

---