Gelation of cellulose/calcium thiocyanate solution and it's application to spinning for fiber

Hattori, Makiko; Shimaya, Yoshihiko; Saito, Masatoshi

doi:10.1016/b978-044450178-3/50033-0

Cited by 2 publications

(1 citation statement)

References 9 publications

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“…In the solidification process, the gel fibers with three-dimensional network structure would be formed in the way of thermally induced gel transition (2). There is a thermal exchange between spinning solution and low temperature coagulation bath (3,4). In the initial stage of gel spinning, a certain amount of non-solvent was often added to the spinning solution as the gel accelerator to promote the gel transition in PAN solution.…”

Section: Introductionmentioning

confidence: 99%

Research on the mechanism of gel accelerator on gel transition of PAN solution by rheology and dynamic light scattering

et al. 2020

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The rheological properties of PAN/DMSO solution and the size and distribution of PAN coils were studied by rheology and dynamic light scattering (DLS) measurements. It was found that water could be used as a gel accelerator and increase the gel transition temperature Tgel and the storage modulus G′ as well as decrease the damping factor tan δ through rheological measurements. DLS test shows that the average size of PAN coils increases significantly with the increase in gel accelerator content. In addition, the gel accelerator can change the mobility of PAN chains during the cooling process. The results show that the gel accelerator can enhance the entanglement of PAN macromolecular chains and improve the formation of three-dimensional network gel structure, so that PAN solution is more prone to gel transition during the cooling process.

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Section: Introductionmentioning

confidence: 99%

Research on the mechanism of gel accelerator on gel transition of PAN solution by rheology and dynamic light scattering

et al. 2020

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New solvent for polyrotaxane. III. Dissolution of a poly(ethylene glycol)/cyclodextrin polyrotaxane in a calcium thiocyanate aqueous solution or N‐methylmorpholine‐N‐oxide monohydrate

Araki¹,

Kataoka²,

Ito³

2007

J of Applied Polymer Sci

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Calcium thiocyanate [Ca(SCN) 2 ] aqueous solutions above 40 wt % and N-methylmorpholine N-oxide (NMMO) monohydrate, which are known to dissolve cellulose, were found to be good solvents for a polyrotaxane comprising a-cyclodextrin and poly(ethylene glycol). The polyrotaxane could be dissolved up to 12 and 10 wt % in a 40 wt % Ca(SCN) 2 aqueous solution and NMMO, respectively. These are the first instances of a neutral aqueous solution and a cyclic amine oxide, respectively, that readily dissolve the polyrotaxane. These new good solvents, as well as other solvents of the polyrotaxane, except for dimethyl sulfoxide, are identical to those of cellulose, indicating that the dissolution mechanism of the polyrotaxane is dominated by intra-and intermolecular hydrogen bonding of the molecule similar to that of cellulose dissolution. The concentrated polyrotaxane solution in a 40 wt % Ca(SCN) 2 aqueous solution showed apparent thixotropy and spontaneous gelation of the solution caused by a gradual increase in its viscosity.

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Gelation of cellulose/calcium thiocyanate solution and it's application to spinning for fiber

Cited by 2 publications

References 9 publications

Research on the mechanism of gel accelerator on gel transition of PAN solution by rheology and dynamic light scattering

Research on the mechanism of gel accelerator on gel transition of PAN solution by rheology and dynamic light scattering

New solvent for polyrotaxane. III. Dissolution of a poly(ethylene glycol)/cyclodextrin polyrotaxane in a calcium thiocyanate aqueous solution or N‐methylmorpholine‐N‐oxide monohydrate

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