Solid state photo crosslinking of plasticized starch filled with microcrystalline cellulose

2021 ◽  
Author(s):  
J. Y. Foong ◽  
A. W. M. Kahar ◽  
S. Razak ◽  
Z. A. Bakar
Keyword(s):  
Solid State ◽  
Microcrystalline Cellulose ◽  
Plasticized Starch

Studies on fluorescence of cellulosics

Holzforschung ◽  
2007 ◽  
Vol 61 (5) ◽  
pp. 504-508 ◽  
Author(s):  
Alain Castellan ◽  
Reinaldo Ruggiero ◽  
Elisabete Frollini ◽  
Ludmila A. Ramos ◽  
Christine Chirat
Keyword(s):  
Solid State ◽  
Microcrystalline Cellulose ◽  
Woody Plants ◽  
Average Molecular Weight ◽  
Homogeneous Medium ◽  
Fluorescence Emission ◽  
Excitation Wavelength ◽  
Experimental Conditions ◽  
Fluorescence Emission Spectra ◽  
Cotton Linters

Abstract Steady-state fluorescence emission spectra of various celluloses were measured at an excitation wavelength of 320 nm. Various spectra recorded in the solid state were compared: (1) ECF bleached papers made of hardwood, the anhydroglucose units of which were chemically modified at C1 and C6 or C2 and C3 positions with carboxylic groups; (2) microcrystalline cellulose; (3) cotton linters; and (4) delignified sisal fibers (mercerized or not). Fluorescence emission was quite independent of the carboxylic acid content and average molecular weight (determined by viscosimetry) of the cellulose polymers. Microcrystalline cellulose (Avicel), cotton linters, and mercerized delignified sisal cellulose were acetylated in homogeneous medium (DMAc/LiCl as solvent system) to obtain soluble polymers in dichloromethane for comparison of spectra recorded in the solid and liquid states. Fluorescence of cellulose acetates in solution (CH2Cl2) and in the solid state was compared under similar experimental conditions to non-esterified celluloses in the solid state. The importance of the solid state for fluorescence emission could be demonstrated. Fluorophores are present in minute amounts in the polymer and their favorable energy transfer for excitation in the solid state likely enhances fluorescence emission. Among numerous fluorophores, dityrosine appeared to be a good candidate for fluorescence because it displayed emission in the fluorescence range of cellulose. Dityrosine is an amino acid involved in the lignification of non-woody plants. Mercerized sisal impregnated with tyrosine in the presence of peroxidase and hydrogen peroxide did not show enhanced emission, in contrast to para-hydroxycinnamic acid (coumaric acid), which is also involved in the lignification process at least for non-woody plants. The origin of cellulose fluorescence remains uncertain and appears to have several origins. This study clearly underlines the importance of the solid state for enhancing fluorophore emission.

Characterization of native and plasticized starch using solid state NMR

2018 ◽  
Author(s):  
Peter Vrábel ◽  
Anton Baran ◽  
Mária Kovaľaková ◽  
Oľga Fričová ◽  
Mária Hutníková ◽  
...  
Keyword(s):  
Solid State ◽  
Solid State Nmr ◽  
Plasticized Starch

scholarly journals Preliminary Study of Potential Bioimplant from Glycerol Plasticized Starch-Microcrystalline Cellulose Composite

2021 ◽  
Vol 1 (1) ◽  
pp. 29-36
Author(s):  
Galih Rineksa ◽  
Yudan Whulanza ◽  
Misri Gozan
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Trabecular Bone ◽  
Microcrystalline Cellulose ◽  
Potential Application ◽  
Thermoplastic Starch ◽  
Bone Replacement ◽  
Preliminary Study ◽  
Plasticized Starch ◽  
Cellulose Composite

Biodegradable and bio-based substitutes for conventional plastics are on the rise in these past decades. One of the applications of bioplastic is for biomedical implants or bioimplant. Starch was plasticized using glycerol at varying amounts (40% and 60% of dry starch mass) to produce thermoplastic starch (TPS). A reinforcement filler of microcrystalline cellulose (MCC) was used to improve the mechanical properties. The MCC content in this study was also varied (0%, 2%, 4%, and 8% w/w). This paper studies the mechanical properties of starch-MCC composites for their potential as bioimplant. The optimum glycerol and MCC contents from the results are 40% glycerol and 8% MCC with 2.97 MPa tensile strength and 7.20% strain at break. Thus, the sample has the potential application in bioimplant material for trabecular bone replacement, which has an average tensile strength of 2 MPa and strains at a break of 2.5%.

Processing and characterization of polyols plasticized-starch reinforced with microcrystalline cellulose

2016 ◽  
Vol 149 ◽  
pp. 83-93 ◽  
Author(s):  
M. Rico ◽  
S. Rodríguez-Llamazares ◽  
L. Barral ◽  
R. Bouza ◽  
B. Montero
Keyword(s):  
Microcrystalline Cellulose ◽  
Plasticized Starch
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