Alternative solvents for cellulose derivatives:

Kiran, Erdoǧan; Pöhler, Holger

doi:10.1016/s0896-8446(98)00090-4

Cited by 18 publications

(2 citation statements)

References 11 publications

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“…It is the main component of higher plant cell walls, and it is also produced by some algae, fungi and bacteria. [83][84][85][86] Cellulose is a polysaccharide made up of D-glucose units joined Cellulose molecules in their native state form long chains in polycrystalline fibrous bundles that possess highly crystalline as well as amorphous regions. Cellulose is incapable of flowing on heating, it degrades before it can melt because the crystalline melting point of cellulose is far above its decomposition temperature.…”

Section: 4: Cellulosementioning

confidence: 99%

“…Cellulose represents one of the most important renewable sources of raw materials in the world. [83][84][85]89 However the polar nature of cellulose makes its interaction with low polar polymers difficult. Grafting of synthetic polymeric chains is one of the most recurrently used methods to increase the compatibility between cellulose and a variety of synthetic polymers.…”

Section: 4: Cellulosementioning

confidence: 99%

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RAFT mediated polysaccharide copolymers

Fleet

McLeary

Grumel

et al. 2008

European Polymer Journal

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ii Declaration I, the undersigned, hereby declare that the work contained in this thesis is my own original work and that I have not previously in its entirety or in part submitted it at any university for a degree. _____________________ Reda FleetSigned on the 27 th day of September 2006. Abstract iii AbstractCellulose, one of the most abundant organic substances on earth, is a linear polymer of D-glucose units joined through 1,4-β-linkages. Cellulose is however not easily processed without chemical modification. A number of techniques exist for the modification of cellulose, of which the viscose process is one of the most widely applied. Grafting of synthetic polymeric chains onto or from cellulosic materials is an useful technique that can be used to combine the strengths of synthetic and natural polymers dramatically, so changing the properties of cellulosic materials (pulp, regenerated cellulose, cellulose derivatives).In this study five model xanthate (Reversible Addition-Fragmentation chain Transfer

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Section: 4: Cellulosementioning

confidence: 99%

Section: 4: Cellulosementioning

confidence: 99%

RAFT mediated polysaccharide copolymers

Fleet

McLeary

Grumel

et al. 2008

European Polymer Journal

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Miscibility, phase separation, and volumetric properties in solutions of poly(dimethylsiloxane) in supercritical carbon dioxide

Bayraktar

Kiran

2000

J. Appl. Polym. Sci.

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Polymer Solutions at High Pressures: Pressure-Induced Miscibility and Phase Separation in Near-critical and Supercritical Fluids

Kiran

Liu

Bayraktar

2002

Computational Studies, Nanotechnology, and Solution Thermodynamics of Polymer Systems

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Pressure-induced miscibility and phase separation constitute the integral steps in a wide range of applications that use supercritical or near-critical fluids as a process or processing medium for polymers. Thermodynamic aspects of miscibility, and the kinetic aspects of the phase separation both play a very important role. Pressure becomes the practical tuning parameter that transforms a fluid or a fluid mixture from behaving like a solvent to one behaving like a non-solvent, thereby inducing miscibility or phase separation. Dynamics of phase separation becomes particularly important if transient (non-equilibrium) structures are to be pinned by proper matching of the process conditions with the onset of transitions in material properties such as the vitrification or crystallization in polymers. This paper provides an overview of factors that influence miscibility and presents the consequences of pressure-induced phase separation in terms of the time scale (kinetics) of new phase formation, the domain growth and structure development in polymer solutions. A time-and angle-resolved light scattering technique combined with controlled pressure quench experiments with different depth of penetration into the region of immiscibility is used to document the kinetics of phase separation and domain growth and identify the crossover from "metastable" to "unstable" region of the phase diagram. This crossover that represents the experimentally accessible spinodal boundary is demonstrated with recent data on pressure-induced phase separation in "poly(dimethylsiloxane) + supercritical carbon dioxide" and "polyethylene + npentane" solutions. The paper also describes a unique application of polymer miscibility and phase separation concepts in the preparation of novel polymerpolymer blends that is based on impregnating a host polymer that is swollen in a fluid with a second polymer that is dissolved in the same fluid at high pressures. The dissolved polymer is in-situ precipitated and entrapped in the host polymer matrix by pressure-induced phase separation. blending of otherwise incompatible polymers, and is demonstrated for blending of polyethylene with poly(dimethylsiloxane) in supercritical carbon dioxide .

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Alternative solvents for cellulose derivatives:

Cited by 18 publications

References 11 publications

RAFT mediated polysaccharide copolymers

RAFT mediated polysaccharide copolymers

Miscibility, phase separation, and volumetric properties in solutions of poly(dimethylsiloxane) in supercritical carbon dioxide

Polymer Solutions at High Pressures: Pressure-Induced Miscibility and Phase Separation in Near-critical and Supercritical Fluids

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