Characterization of the thermal properties of microcrystalline cellulose by modulated temperature differential scanning calorimetry

Picker, Katharina M.; Hoag, Stephen W.

doi:10.1002/jps.10018

Cited by 62 publications

(23 citation statements)

References 27 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…These data show how troublesome it is to achieve the full desorption of water from the surface of hydrophilic fillers. This problem was also mentioned in other studies [57,58] that evaluated the effect of water content on the glass transition temperature. According to Fig.…”

Section: Dsc Investigationmentioning

confidence: 70%

Universal approach of cellulose fibres chemical modification result analysis via commonly used techniques

2018

View full text Add to dashboard Cite

This article considers the modification of cellulose fibres with the use of vinyltrimethoxysilane and maleic anhydride as substances to improve the wettability of the additive in the hydrophobic polymer matrix. The stress is put on the possible ways of modification impact investigation and its description. Effects of the treatment are analysed using Fourier transform infrared spectroscopy, which reveal the presence of new moieties on the cellulose surface, e.g. C=C bonds, C=O and Si-C groups, while dynamic light scattering investigation revealed an increase in the hydrodynamic radii of the molecules which was maximized in the case of modification with the use of maleic anhydride. Furthermore, thermal properties were defined with differential scanning calorimetry and thermogravimetric analysis. Some variations within the process of samples thermal degradation are observed-thermal stability of the specimen modified with maleic anhydride is the highest. The presented approach of combined fibre modification analysis techniques, being a scientific novelty, allows to confirm the treatment impact on cellulose properties at many levels. Graphical abstractKeywords Cellulose · Maleic anhydride · Vinyltrimethoxysilane

show abstract

Section: Dsc Investigationmentioning

confidence: 70%

Universal approach of cellulose fibres chemical modification result analysis via commonly used techniques

2018

View full text Add to dashboard Cite

show abstract

“…A sharp decrease in ω-values with increasing d-values indicates brittle behavior as described by Picker and Hoag. 20 Comparing the HPC grades in Figure 4b, increased brittle behavior can be seen for the coarsely milled, larger particle grades. At the same time, there is an increase in elasticity with increasing maximum relative density.…”

Section: E4mentioning

confidence: 98%

Physical mechanical and tablet formation properties of hydroxypropylcellulose: In pure form and in mixtures

Picker‐Freyer

Dürig

2007

AAPS PharmSciTech

View full text Add to dashboard Cite

The aim of the study was to analyze hydroxypropylcellulose (HPC) in pure form and in excipient mixtures and to relate its physical and chemical properties to tablet binder functionality. The materials used were Klucel hydroxypropylcellulose grades ranging from low to high molecular weight (80-1000 kDa) of regular particle size (250 μm mean size) and fine particle size (80 μm mean size). These were compared with microcrystalline cellulose, spray-dried lactose, and dicalcium phosphate dihydrate. Thermal behavior of HPC was analyzed by modulated temperature differential scanning calorimetry (MTDSC). Tablets of the pure materials and of dry blends with 4% low viscosity, fine particle HPC and 30% high viscosity, fine particle HPC were produced on an instrumented eccentric tableting machine at 3 relative humidities. The 3-dimensional (3-D) model with the parameters time plasticity d, pressure plasticity e, and the twisting angle ω, the inverse of fast elastic decompression was compared with the Heckel method for characterization of compaction. Elastic recovery and compactibility were also studied. The results show that HPC tablet formation is characterized by high plastic deformation. The d, e, and ω values were markedly higher as compared with the reference materials. Plasticity was highest for the fine particle size HPC types. Maximum compactibility was observed for low molecular weight, fine particle size HPC. Tableting of the mixtures showed deformation, which was strongly influenced by HPC. Plasticity and crushing force of formed tablets was increased. In conclusion, HPC is characterized by strong plastic deformation properties, which are molecular weight and particle size dependent.

show abstract

“…Cellulose nanocrystals are the crystalline portion of cellulose. The crystalline domain is highly ordered and much more resistant to acid hydrolysis compared to its amorphous counterpart (Haafiz et al 2013;Jankauskait_ e et al 2014;Pandey et al 2013;Picker and Hoag 2002;Yakubu et al 2011).…”

Section: Introductionmentioning

confidence: 97%

Structure, morphology and mechanical behaviour of novel bio-based polyurethane composites with microcrystalline cellulose

Głowińska

Datta

2015

Cellulose

View full text Add to dashboard Cite

The aim of this work was to obtain biobased polyurethane composites using biocomponents such as, bio-glycol, modified natural oil-based polyol, and microcrystalline cellulose (MCC). The prepolymer method was used to prepare the biobased polyurethane matrix. Prepolymer synthesised from 4,4 0 -diphenylmethane diisocyanate and a polyol mixture containing 75 wt% commercial polyether and 25 wt% hydroxylated soybean oils (H3) was later subjected to chain extension polymerization with bio-1,3-propanediol acting as a chain extender. Different composites were produced by dispersing 5, 10, 15 and 20 wt% of microcrystalline cellulose powder in the polyurethane matrix. The polymerization reaction was catalyzed with 1,4-diazabicyclo[2.2.2]octane. The influence of MCC content on the structure and the mechanical and thermo-mechanical properties of the obtained biobased polyurethane composites was investigated. The FTIR analysis demonstrated that the addition of MCC did not significantly change the chemical structure of the obtained composites. The SEM images showed good interfacial adhesion between the bio-filler and the partially bio-based matrix of the composites. The results of thermo-mechanical analysis demonstrated that the application of MCC filler affected the storage and loss moduli. The tensile strength and elongation at break decreased with increasing MCC content. Moreover, the addition of MCC improved the hardness of the obtained environmentally friendly materials.

show abstract

Characterization of the thermal properties of microcrystalline cellulose by modulated temperature differential scanning calorimetry

Cited by 62 publications

References 27 publications

Universal approach of cellulose fibres chemical modification result analysis via commonly used techniques

Universal approach of cellulose fibres chemical modification result analysis via commonly used techniques

Physical mechanical and tablet formation properties of hydroxypropylcellulose: In pure form and in mixtures

Structure, morphology and mechanical behaviour of novel bio-based polyurethane composites with microcrystalline cellulose

Contact Info

Product

Resources

About