Glass transition temperature of chitosan and miscibility of chitosan/poly(N-vinyl pyrrolidone) blends

Sakurai, Kensuke; Maegawa, Taketeru; Takahashi, Toshisada

doi:10.1016/s0032-3861(00)00067-7

Cited by 436 publications

(242 citation statements)

References 6 publications

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“…Under nitrogen flow, a nonoxidative degradation occurred. There were two steps of degradation for the composites; first range (50-200 ∘ C) was associated with the loss of water which was about 5-9 wt.%, whereas the second range (200-350 ∘ C) corresponded to the degradation and deacetylation of chitosan [31,32]. Composite SB-1 decomposed faster than any other composite and SB-5 showed the highest resistance to temperature increase (as shown in Figure 6).…”

Section: Thermal Stability Of Cht-mc Compositesmentioning

confidence: 97%

“…Secondly, a wide variation in glass transition temperature may be observed due to the source and/or method of extraction. Generally the minimum and maximum glass transition temperature of chitosan are −23 ∘ C and 203 ∘ C, respectively [31,32], and the decomposition temperature of chitosan was found 295 ∘ C [34].…”

Section: Thermal Stability Of Cht-mc Compositesmentioning

confidence: 98%

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Facile Preparation of Biocomposite from Prawn Shell Derived Chitosan and Kaolinite-Rich Locally Available Clay

Biswas

Rashid

Mallik

et al. 2017

International Journal of Polymer Science

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A novel composite material was prepared from prawn shell derived chitosan (CHT) and locally available kaolinite-rich modified Bijoypur clay (MC) using a facile technique in which dilute acetic acid was used as a solvent for dissolving chitosan and composite fabrication whereas distilled water was used for preparing the clay dispersion. Bijoypur clay mainly consists of kaolinite clay mineral and it was modified with the dodecyl amine to make it organophilic. Morphology and properties of the composites (different weight ratio of MC and CHT) have been studied and compared with those of pure CHT and MC. Purification and modification of Bijoypur clay were investigated by X-ray diffraction (XRD), X-ray fluorescence (XRF), and Fourier transformed infrared spectroscopy (FTIR) analyses. The fabrication of CHT-MC composites was confirmed by FTIR analysis. Thermogravimetric analysis (TGA) and differential scanning colorimetry (DSC) were used to investigate the thermal stability of the composites. It was observed that dispersed clay improves the thermal stability and enhances the hardness of the matrix systematically with the increase of clay loading. In this study, a better insolubility in both acidic and alkaline media of the composites is also observed compared to pure chitosan.

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Section: Thermal Stability Of Cht-mc Compositesmentioning

confidence: 97%

Section: Thermal Stability Of Cht-mc Compositesmentioning

confidence: 98%

Facile Preparation of Biocomposite from Prawn Shell Derived Chitosan and Kaolinite-Rich Locally Available Clay

Biswas

Rashid

Mallik

et al. 2017

International Journal of Polymer Science

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“…Ratto, Hatakeyama and Blumstein (1995) obtained a Tg value of 30 °C for a chitosan sample. Sakurai, Maegawa and Takahashi (2000) found a Tg value of 203 o C, whereas Kittur et al (2002) and Netto et al (2005) did not found any evidence of Tg suggesting, therefore, that the Tg of chitosan could be close to the polymer's thermal degradation temperature one of criteria adopted for assessing the miscibility of polymer systems is based on the determination of glass transition temperature (Tg). In order to be considered a miscible polymeric system, it must have a single glass transition located at an intermediate range of temperature for transitions of pure components (BARBANI et al, 2005).…”

Section: Mechanical Propertiesmentioning

confidence: 99%

Determination of structural and mechanical properties, diffractometry, and thermal analysis of chitosan and hydroxypropylmethylcellulose (HPMC) films plasticized with sorbitol

Rotta

Minatti

Barreto

2011

Ciênc. Tecnol. Aliment.

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“…Therefore, the apparent viscosity decreased. Because viscous flow activation energy of chitosan was particularly large and viscosity of sample was sensitive to temperature, product stability was affected by these factors (Sakurai et al, 2000). In the process of production, high viscosity can lead to difficult conveying processing of sample, while low viscosity of sample can lead to difficult shaping and overlapping temperature circular sweep curves.…”

Section: Temperature Sweep Measurementmentioning

confidence: 99%

Production and characterization of nanocapsules encapsulated linalool by ionic gelation method using chitosan as wall material

Xiao

Zhu

2017

Food Sci. Technol

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Linalool has been extensively applied in various fields, such as flavoring agent, perfumes, cosmetics and medical science. However, linalool is unstable, volatile and readily oxidizable. A sensitive substance can be encapsulated in a capsule, so encapsulation technology can solve these problems. In this paper, linalool-loaded nanocapsules (Lin-nanocapsules) were prepared via the ionic gelation method and Lin-nanocapsules were characterized. The results of Fourier transformation infrared spectroscopy (FTIR) showed that linalool was successfully encapsulated in the wall materials. Scanning electron microscopy (SEM) results demonstrated that the shapes of Lin-nanocapsules, with smooth surfaces, were nearly spherical. Lin-nanocapsule average particle size was 352 nm and its polydispersity index (PDI) was proved to be 0.214 by the results of dynamic light scattering (DLC). Thermogravimetric results indicated that linalool loading capacity (LC) was 15.17%, and encapsulation could decrease linalool release and increase linalool retaining time under the high temperature. Oscillatory shear and steady-state shear measurements of Lin-nanocapsule emulsions were systematically investigated. The results of steady-state shear showed that Lin-nanocapsule emulsion, which was Newtonian only for high shear rate, was non-Newtonian. It was proved by oscillatory shear that when oscillation frequency changed from low to high, Lin-nanocapsules emulsion changed from viscous into elastic.Keywords: lin-nanocapsules; flavor; encapsulation; rheology.Practical Application: Lin-nanocapsules were prepared via the ionic gelation method.

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Glass transition temperature of chitosan and miscibility of chitosan/poly(N-vinyl pyrrolidone) blends

Cited by 436 publications

References 6 publications

Facile Preparation of Biocomposite from Prawn Shell Derived Chitosan and Kaolinite-Rich Locally Available Clay

Facile Preparation of Biocomposite from Prawn Shell Derived Chitosan and Kaolinite-Rich Locally Available Clay

Determination of structural and mechanical properties, diffractometry, and thermal analysis of chitosan and hydroxypropylmethylcellulose (HPMC) films plasticized with sorbitol

Production and characterization of nanocapsules encapsulated linalool by ionic gelation method using chitosan as wall material

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