Clay polymer nanocomposites films

As mentioned previously, the barrier properties of PLA nanocomposites depend both on the particle size and on the dispersion. If the dispersion in two samples is of the same order, the barrier properties depend on the size of the particles and vice versa [118]. Gas and vapor barrier properties of polymer nanocomposite films are increased because of the large aspect ratios of the clays that result in strong interfacial interactions between the polymeric matrix and the nanoclays [123]. Depending on the strength of the polymer/clay interfacial interactions, three broad classes of nanocomposites are thermodynamically achievable (Figure 12.9) [118] ... [Pg.173]

When a solvent diffuses across a neat polymer, it must travel the thickness of the sample (do). When the same solvent diffuses through a nanocomposite film with nanoclays, its path length is increased by the distance it must travel around each clay layer it strikes. According to Lan et al. [99] the path length of a gas molecule diffusing through an exfoliated nanocomposite is... [Pg.43]

Polyimide-clay nanocomposites constitute another example of the synthesis of nanocomposite from polymer solution [70-76]. Polyimide-clay nanocomposite films were produced via polymerization of 4,4 -diaminodiphenyl ether and pyromellitic dianhydride in dimethylacetamide (DMAC) solvent, followed by mixing of the poly(amic acid) solution with organoclay dispersed in DMAC. Synthetic mica and MMT produced primarily exfoliated nanocomposites, while saponite and hectorite led to only monolayer intercalation in the clay galleries [71]. Dramatic improvements in barrier properties, thermal stability, and modulus were observed for these nanocomposites. Polyimide-clay nanocomposites containing only a small fraction of clay exhibited a several-fold reduction in the... [Pg.665]

Bafna, A., Beaucage, G., MirabeUa, F., and Mehta, S., 3D hierarchical orientation in polymer-clay nanocomposite films. Polymer, 44,1103-1115 (2003). [Pg.695]

Polymer matrix nanocomposite is the most important type of nanocomposite in which the performance of a polymer matrix can be enhanced by appropriately adding nanoparticulates to it [12] and good dispersion of the filler can be achieved [ 12]. A imiform dispersion of nanoparticles leads to a very large matrix/filler interfacial area, which changes the molecular mobility, the relaxation behavior and the consequent thermal and mechanical properties of the material. A polymer matrix could be reinforced by much stiffer nanoparticles [13,14] of ceramics, clays, or carbon nanotubes, etc. Recent research on thin films (thickness < 50 micrometer) made of polymer nanocomposites has resulted in a new and scalable synthesis technique increasing the facile incorporation of greater nanomaterial quantities [15]. Such advances will enable the future development of multifunctional small scale devices (i.e., sensors, actuators, medical equipment), which rely on polymer nanocomposites. [Pg.521]

Russo P, Cammarano S, Bilotti E, Peijs T, Cerruti P, Aciemo D (2014) Physical properties of poly lactic acid/clay nanocomposite films effect of filler content and annealing treatment. J Appl Polym Sci 131. doi 10.1002/app.39798... [Pg.79]

Mishra et al. (2014) reported the release of dexamethasone from blood-compatible PURs and PUR-clay nanocomposites. They showed that PUR and PUR nanocomposite films did not induce platelet damage or aggregation in in vitro tests, thus displaying excellent blood compatibility. They were able to sustain dexamethasone release for up to 2 weeks depending on the polymer composition. PUR/clay nanocomposites possessed a slower release rate compared to pure PURs and were able to minimize the burst effect in the first hours of release. [Pg.406]

For his theoretical expressions, Nielsen [122] assumed that the sheets are placed perpendicular to the diffusive pathway. Therefore, the above expressions describe that the gas permeability of nanocomposite films depends primarily on three factors (1) the dimension of the dispersed layered silicate particles, (2) the dispersion of the layered silicate particles in the polymer matrix, and (3) the percentage of silicate particles loaded in the film. On the basis of Nielsen s model, Yano et al. [121] published several equations (Equations 12.23 and 12.24) where the diffusion process in nanocomposites (using polyimide-clay hybrids made by mixing 4,4 -diaminodiphenylether and pyromellitic dianhydride)... [Pg.173]

Bartczak, Z., Rozanski, A., and Richert, J. Characterization of clay platelet orientation in polylactide-montmorillonite nanocomposite films by X-ray pole figures. Eur. Polym. J. 61 (2014) 274-284. [Pg.169]

Tun9 S, Duman O (2010) Preparation and characterization of biodegradable methyl cellulose/ montmorillonite nanocomposite films. Appl Clay Sci 48 414 24 Turbak AF, Snyder FW, Sandberg KR (1983) Microfibrillated cellulose, a new cellulose product properties, uses, and commercial potential. J Appl Polym Sci Appl Polym Symp 37 815-827 Ung T, Liz-Marzan LM, Mulvaney P (2002) Gold nanoparticle. Thin Films Colloid Surf A 202 119-126... [Pg.75]

Xie W, Gao Z, Liu K, Pan WP, Vaia R, Hunter D, Singh A (2001) Thermal characterization of organically modified montmorillonite. Thermochim Acta 367-368 339-350 Xie W, Xie R, Pan W-P, Hunter D, Koene B, Tan L-S, Vaia R (2002) Thermal stability of quaternary phosphonium modified montmorillonites. Chem Mater 14(11) 4837 845 Xu Y, Ren X, Hanna MA (2006) Chitosan/clay nanocomposite film preparation and characterization. J Appl Polym Sci 99(4) 1684—1691... [Pg.136]

C5 ras VP, Manfredi LB, Ton-That M-T, Vazquez A (2008) Physical and mechanical properties of thermoplastic starch/montmorillonite nanocomposite films. Carbohydr Polym 73 55-63 de Morals Teixeira E, Correa A, Manzoli A, de Lima Leite F, de Oliveira C, Mattoso L (2010) Cellulose nanofibers from white and naturally colored cotton fibers. Cellulose 17 595-606 de Moura MR, Aouada FA, Avena-Bustillos RJ, McHugh TH, Krochta JM, Mattoso LHC (2009) Improved barrier and mechanical properties of novel hydrox5q)ropyl methylcellulose edible films with chitosan/tripolyphosphate nanoparticles. J Food Eng 92 448—453 Dean K, Yu L, Wu DY (2007) Preparation and characterization of melt-extruded thermoplastic starch/clay nanocomposites. Compos Sci Technol 67 413 21 Duanmu J, Gamstedt EK, Rosling A (2007) Hygromechanical properties of composites of crosslinked allylglycidyl-ether modified starch reinforced by wood fibres. Compos Sci Technol 67 3090-3097... [Pg.359]

Masoodi R, El-Hajjar RF, Pillai KM, Sabo R (2012) Mechanical characterization of cellulose nanofibca- and bio-based epoxy composite. Maha- Des 36 570-576 Melo Cd, Garcia PS, Grossmann MVE, YamashitaF, Dali Antonia LH, Mali S (2011) Properties of extraded xanthan-starch-clay nanocomposite films. Braz Arch Biol Technol 54 1223-1333 Mogri Z, Paul DR (2001) Water-vapor permeation in semicrystalhne and molten poly(octadecyl acrylate). J Polym Sci, Part B Polym Phys 39 979-984 Mohanty AK, Misra M, Drzal LT (2002) Sustainable bio-composites from renewable resources opportunities and challenges in the green mahaials worid. J Polym Environ 10 19-26... [Pg.361]

Katerinopoulou K, Giannakas A, Grigoriadi K, Barkoula NM, Ladavos A (2014) Preparation and characterization of acetylated com starch-(PVOH)/clay nanocomposite films. Carbohydr Polym 102 216-222... [Pg.463]

This chapter describes recent progress in studies aimed at understanding effects of various chemical modification methods on the state of dispersion of clay particles in a high-temperature PI matrix and on the physical properties of polymer/clay nanocomposite films. Three different modification methods and their effects on the Pl/clay nanocomposite... [Pg.122]

Bafria A, Beaucage G, Mirahella F, Mehta S (2003) 3D Hierarchical orientation in polymer-clay nanocomposite films. Polymer 44(4) 1103-1115... [Pg.336]

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