Graft copolymers from cellulose: Synthesis, characterization and evaluation

Thakur, Vijay Kumar; Thakur, Manju Kumari; Gupta, Raju Kumar

doi:10.1016/j.carbpol.2013.04.069

Cited by 177 publications

(64 citation statements)

References 29 publications

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“…The performance of weak gel include gelling performance and stability performance. Most of the present research focus on the gel system itself [2,3] . The study about the rule of influence of pH, especially how does pH change the stability of weak gel, is relatively less [4] .…”

Section: Introductionmentioning

confidence: 99%

Effect of pH on Gelling Performance and stability of HPAM/Cr3+ Weak Gel

Gu¹,

Sang²,

Zhang³

et al. 2015

Proceedings of the 2015 International Forum on Energy, Environment Science and Materials

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Abstract:The article studied the influence of pH to the gelling properties and stability of HPAM/Cr 3+ , the results shows that the alkaline environment could promote the gelation rate and strength. The gelation rate can be lifted properly by increasing the pH value. The HPAM/Cr 3+ which exist in the alkaline has shorter stable stage and worse stability. When existing in the environment of pH=8, the gel get the largest viscosity. Considering both strength and stability, the best range of pH value is 7~8.

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Section: Introductionmentioning

confidence: 99%

Effect of pH on Gelling Performance and stability of HPAM/Cr3+ Weak Gel

Gu¹,

Sang²,

Zhang³

et al. 2015

Proceedings of the 2015 International Forum on Energy, Environment Science and Materials

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“…1), exhibiting many unique properties and applicability to a variety of uses such as paper, textiles, membranes, artificial fibers, Fig. 1 Schematics of a single cellulose chain repeat unit, showing the directionality of the 1-4 linkage and intrachain hydrogen bonding (dotted line) (Moon et al 2011) biomedical, and the food industry (Thakur et al 2013e). The repeat unit is comprised of two anhydroglucose rings ((C 6 H 10 O 5 )n; n = 10,000-15,000, where n is dependent on the cellulose source material) linked together through an oxygen covalently bonded to C1 of one glucose ring and C4 of the adjoining ring (1-4 linkage) and so-called the b 1-4 glucosidic bond (Azizi Samir et al 2005).…”

Section: Regenerated Cellulosementioning

confidence: 98%

Bionanocomposites of Regenerated Cellulose Reinforced with Halloysite Nanoclay and Graphene Nanoplatelets: Characterizations and Properties

Soheilmoghaddam

Pour

Wahit

et al. 2015

Advanced Structured Materials

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In recent years, the development of environmentally friendly materials obtained from renewable resources has attracted immense interest due to the new sustainable development policies. Cellulose is a readily available, naturally occurring biodegradable, and biocompatible linear polysaccharide. Recently, room temperature ionic liquids have been used as solvents to produce regenerated cellulose (RC) due to their attractive properties such as good chemical and thermal stability, low flammability, low melting point, and ease of recycling. Polymer/ nanofiller nanocomposites are believed to have strong potential to widen polymer applications due to enhanced performance. It is also widely accepted that the incorporation of small amount of nanofiller (less than 5 wt%) into bio-based matrixes to produce nano-biocomposite materials with enhanced mechanical, permeability, and thermal properties. The tubular silica-based naturally occurring nanofiller, halloysite nanotubes (HNT), has been investigated due to its high surface area, unique geometry, and its potential to make the hydrogen bonding with polymers to disperse well in the matrix. Graphene nanoplatelets (GNP) have also attracted enormous attention among polymer engineers over the last few years due to its unique electrical, thermal, and mechanical properties. Single layer twodimensional GNP sheet is considered as the strongest material along with the high surface area and aspect ratio. The chapter aims to highlight the effect of the addition of two different types of nanofillers such as HNT and GNP to produce RC nanocomposites on selected properties.

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“…In surface modifications, either hydroxyl groups get activated or new moieties are added that can effectively interlock with the matrix. Mercerization (Singha et al 2009), acrylation, acetylation, silane treatment (Singha et al 2009), and peroxide treatment with various coupling agents, graft copolymerization (Thakur et al 2011(Thakur et al , 2012a(Thakur et al , 2013a, plasma treatments, and other pretreatments of natural fibers have achieved various levels of success in improving fiber strength, fiber fitness, and fiber-matrix adhesion in natural fiber reinforced composites (Singha and Thakur 2010a, b, c). Simple chemical treatments can be applied to the fibers to change surface tension and polarity through modification of fiber surface.…”

Section: Introductionmentioning

confidence: 98%

Static and Dynamic Mechanical Analysis of Coir Fiber/Montmorillonite Nanoclay-Filled Novolac/Epoxy Hybrid Nanocomposites

Saw

2015

Advanced Structured Materials

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A simple method for the preparation of novel nanocomposites involving different weight ratios of blends of epoxy novolac (ENR) and diglycidyl ether of bisphenol A (DGEBA) resin, natural coir fiber, and organically modified montmorillonite (OMMT) nanoclay is described. It was found that on blending ENR with DGEBA, the storage modulus at room temperature are enhanced by about 100 % or more in the case of 50 and 65 % ENR-containing matrices; whereas, the enhancement in the case of 20 and 35 % ENR-containing matrices is only 50 % that of the pure matrix. It was also observed that the tan δ peak heights of the composite containing 50 and 65 % ENR are closer to that of 35 % ENR-containing composite. The plausible explanation is made on the basis of experimental findings of static and dynamic mechanical analysis (DMA) of ENR and DGEBA resin blends. X-ray diffraction (XRD) studies and Fourier transform infrared (FTIR) spectroscopy was used to obtain information on the modification of nanoclay and also thermal stability of various nanocomposites were determined from thermo gravimetric analyses. DMA showed that the modification of the clay strongly influences the stiffness and glass transition temperature (T g ) of the nanocomposites. It is possible to manufacture coir composites with increased stiffness without sacrificing their ductility.

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Graft copolymers from cellulose: Synthesis, characterization and evaluation

Cited by 177 publications

References 29 publications

Effect of pH on Gelling Performance and stability of HPAM/Cr3+ Weak Gel

Effect of pH on Gelling Performance and stability of HPAM/Cr3+ Weak Gel

Bionanocomposites of Regenerated Cellulose Reinforced with Halloysite Nanoclay and Graphene Nanoplatelets: Characterizations and Properties

Static and Dynamic Mechanical Analysis of Coir Fiber/Montmorillonite Nanoclay-Filled Novolac/Epoxy Hybrid Nanocomposites

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