Preparation and characterization of zeolite beta–polyurethane composite membranes

Aksoy, Eda Ayşe; Akata, Burcu; Baç, Nurcan; Hasırcı, Nesrin

doi:10.1002/app.25976

Cited by 21 publications

(18 citation statements)

References 51 publications

(42 reference statements)

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“…Polyurethanes are relatively polar polymers and can interact with the polar groups of cellulose, leading to good interfacial adhesion, which is essential for enhanced mechanical properties (Aksoy et al 2007). PU-MFC composite materials were prepared recently using a film stacking method in which the PU films and non-woven cellulose fibril mats were stacked and compression moulded (Seydibeyoglu and Oksman 2008).…”

Section: Polyurethanesmentioning

confidence: 99%

Microfibrillated cellulose and new nanocomposite materials: a review

2010

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Due to their abundance, high strength and stiffness, low weight and biodegradability, nano-scale cellulose fiber materials (e.g., microfibrillated cellulose and bacterial cellulose) serve as promising candidates for bio-nanocomposite production. Such new high-value materials are the subject of continuing research and are commercially interesting in terms of new products from the pulp and paper industry and the agricultural sector. Cellulose nanofibers can be extracted from various plant sources and, although the mechanical separation of plant fibers into smaller elementary constituents has typically required high energy input, chemical and/or enzymatic fiber pre-treatments have been developed to overcome this problem. A challenge associated with using nanocellulose in composites is the lack of compatibility with hydrophobic polymers and various chemical modification methods have been explored in order to address this hurdle. This review summarizes progress in nanocellulose preparation with a particular focus on microfibrillated cellulose and also discusses recent developments in bio-nanocomposite fabrication based on nanocellulose.

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Section: Polyurethanesmentioning

confidence: 99%

Microfibrillated cellulose and new nanocomposite materials: a review

2010

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“…A similar behavior was noticed by other researchers in the case of the introduction of nanosilica particles. It was suggested that the modification agent used in the nano-silica particles was acting as softer in the macromolecular chains of the polymers [17,47]. The value of tand at T g depends not only on the concentration of the polyimide segments in the composite, but also on polymer chain interactions.…”

Section: Thermal Properties Of Composite Filmsmentioning

confidence: 99%

“…Other studies show that the introduction of zeolites into polymers can improve some of their properties. Zeolites offer different parameters (Si/Al ratio, ion-exchange properties) that can be used as tools for tailoring the properties of the composite membranes [17][18][19][20][21]. Zeolite-containing polypyrrole or polyaniline composites were prepared and characterized.…”

Section: Introductionmentioning

confidence: 99%

The effect of zeolite L content on dielectric behavior and thermal stability of polyimide thin films

Hamciuc¹,

Hamciuc²,

Okrasa

et al. 2012

J Mater Sci

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Zeolite L, with the ratio Si/Al = 4, was prepared by hydrothermal method and used to obtain composite films based on a polyimide matrix having pendant carboxylic groups. The effect of zeolite L content on dielectric behavior and thermal stability of polyimide thin films was studied. The films were prepared by casting a suspension resulting from direct mixing of a poly(amic acid) (PAA) solution and zeolite L particles onto glass plates, followed by thermal imidization under controlled temperature conditions. The PAA was synthesized by solution polycondensation of a mixture of two diamines, 3,5-diaminobenzoic acid and 2,2-bis[4-(4-aminophenoxy)phenyl]propane (molar ratio 1:3), with 4,4 0 -oxydiphthalic anhydride, using N-methyl-2-pyrrolidone as solvent. To improve the compatibility between organic and inorganic phases, the surface of zeolite particles was modified by treating with 3-aminopropyltriethoxysilane. The surface morphology of the composite films investigated by scanning electron microscopy showed good compatibility between filler and polymer matrix. The films were flexible, tough, and exhibited high-thermal stability, having the initial decomposition temperature above 450°C. Dynamic mechanical analysis and dielectric spectroscopy revealed sub-glass transitions, c and b, and an a relaxation corresponding to the segmental motions above the glass transition temperature. The values of the dielectric constant at 10 kHz and 200°C were in the range of 3.3-4.2.

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“…They have been utilized as a reinforcing material to improve various polymer including starch (Dufresne and Vignon, 1998), polyvinyl alcohol (Bhatnagar and Sain, 2005), chitosan (Nordqvist et al, 2007), and polyurethane (Aksoy et al, 2007).…”

Section: Resultsmentioning

confidence: 99%

Preparation, structure, and properties of cellulose nanofibril/silk sericin composite film

Jang¹,

Park²,

Kweon³

et al. 2015

International Journal of Industrial Entomology

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Recently, sericin has attracted increasing attention in biomedical and cosmetic research because of its useful properties including acceleration of wound healing, improvement of cell attachment, and inhibition of ultraviolet-B induced apoptosis. However, sericin films have poor mechanical properties, which restricts the application to those fields. In this study, cellulose nanofibril (CNF)/sericin composite films were fabricated by solvent casting, and the effects of ultrasonication time and CNF content on the solution turbidity, molecular conformation, and film mechanical properties of sericin film were examined. As the ultrasonication time increased, the turbidity of the CNF/sericin suspension decreased. Conversely, as the CNF content increased, the turbidity increased. However, b-sheet crystallization and mechanical properties remained almost unchanged by varying the ultrasonication time and CNF content, indicating that CNF is not effective to improve the mechanical properties of sericin films.

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Preparation and characterization of zeolite beta–polyurethane composite membranes

Cited by 21 publications

References 51 publications

Microfibrillated cellulose and new nanocomposite materials: a review

Microfibrillated cellulose and new nanocomposite materials: a review

The effect of zeolite L content on dielectric behavior and thermal stability of polyimide thin films

Preparation, structure, and properties of cellulose nanofibril/silk sericin composite film

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