scholarly journals Preparation and Properties of Viscose Rayon/O-carboxymethyl Chitosan Antibacterial Fibers

2011 ◽  
Vol 6 (3) ◽  
pp. 155892501100600 ◽  
Author(s):  
Youbo Di ◽  
Guoqiang Long ◽  
Huiqin Zhang ◽  
Qingshan Li
Keyword(s):  
Mechanical Properties ◽  
Viscose Rayon ◽  
Moisture Absorption ◽  
Cellulose Xanthate ◽  
Carboxymethyl Chitosan ◽  
Infrared Scanning ◽  
Transmission Electron ◽  
Structure Morphology ◽  
Viscose Process ◽  
Morphology And Mechanical Properties

Antimicrobial viscose rayon/O-carboxymethyl chitosan fibers (VCMFs) were manufactured by spinning the mixture of O-carboxymethyl chitosan (O-CMCS) xanthate and cellulose xanthate via the viscose process. The structure, morphology and mechanical properties were investigated by infrared, scanning electron microscopy, transmission electron microscope and tensile test. The results show that the blend fibers of cellulose and O-CMCS were satisfactorily prepared and the two polymers were mixed homogeneously. VCMFs display striation along the fiber similar to those of viscose rayon fibers, and their mechanical properties are close to that of viscose rayon. With O-CMCS blended, VCMFs showed good moisture absorption and antibacterial activity against E.coli.

Polyolefin blends: 2. Effect of EPR composition on structure, morphology and mechanical properties of iPP/EPR alloys

Polymer ◽  
1987 ◽  
Vol 28 (11) ◽  
pp. 1929-1936 ◽  
Author(s):  
R. Greco ◽  
C. Mancarella ◽  
E. Martuscelli ◽  
G. Ragosta ◽  
Jinghua Yin
Keyword(s):  
Mechanical Properties ◽  
Polyolefin Blends ◽  
Structure Morphology ◽  
Morphology And Mechanical Properties

Photodynamically Crosslinked and Chitosan-incorporated Dentin Collagen

2011 ◽  
Vol 90 (11) ◽  
pp. 1346-1351 ◽  
Author(s):  
A. Shrestha ◽  
S. Friedman ◽  
A. Kishen
Keyword(s):  
Mechanical Properties ◽  
Enzymatic Degradation ◽  
Structural Integrity ◽  
Chemical Characterization ◽  
Collagen Matrix ◽  
Carboxymethyl Chitosan ◽  
Coherent Light ◽  
Transmission Electron ◽  
Human Dentin ◽  
Dentin Collagen

A lingering concern with restored root-filled teeth is the loss of structural integrity of the dentin and dentin-sealer interface over time. We hypothesized that crosslinking of dentin collagen with simultaneous incorporation of a biopolymer into collagen matrix would improve its structural stability. This study aimed to investigate the effects of combining chemical/photodynamic crosslinking of dentin collagen with the incorporation of carboxymethyl-chitosan (CMCS) on the resistance to enzymatic degradation and mechanical properties of dentin collagen. Ninety-six demineralized dentin collagen specimens (human, n = 72; and bovine, n = 24) were prepared and crosslinked chemically/ photodynamically, with/without CMCS. Glutaraldehyde and carbodiimides were used for chemical crosslinking, while rose Bengal activated with a non-coherent light (540 nm) at 20 J/cm2 was applied for photodynamic crosslinking. The crosslinked human dentin collagen was subjected to chemical characterization, 7 days enzymatic degradation, and transmission electron microscopy (TEM), while the bovine dentin collagen was used for tensile-testing. Crosslinked collagen showed significantly higher resistance to enzymatic degradation ( p < 0.01), stable ultrastructure, and increased tensile strength ( p < 0.05). Crosslinking CMCS with collagen matrix as observed in the TEM further improved the mechanical properties of dentin collagen ( p < 0.01). This study highlighted the possibility of improving the resistance and toughness of dentin collagen by chemically/photodynamically crosslinking collagen matrix with CMCS.

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