Thermal, water absorption, and mechanical characterizations of polylactide based nanocomposites: Comparison between sodium and modified montmorillonite as reinforcement materials

Montmorillonite (MMT) was modified with chitosan (CS). The XRD and FT-IR analyses showed that the CS chains had intercalated into the MMT sheets and the strong chemical interaction between the Si-O bonds from MMT and the -NH2, -CONH- and -OH groups from CS was the driving force for intercalation. Polyacrylate (PAA)/modified MMT superabsorbent composites were fabricated by effectively dispersing the modified MMT in acrylic acid solution and polymerizing the acid. Compared with PAA, the water absorption of the PAA/modified MMT composite was increased by 91 g/g. This might arise from the combined effect of the hydrophilic groups from PAA and CS and the strong interaction between modified MMT and PAA; this explanation was consistent with the FT-IR spectrum. The introduction of unmodified MMT to PAA caused a 171 g/g water absorption loss. The rate of water absorption of PAA/modified MMT superabsorbents was decreased and the capacity for water retention was higher than that of PAA and PAA/unmodified MMT. This could be explained by the barrier properties of the nanodispersed MMT sheets in the PAA/modified MMT composites. After exposure to a high pressure mercury lamp for 20 days, PAA/PAA/MMT and PAA/modified MMT superabsorbents had losses in water absorption of 12.1%/8.6%/5.8% respectively.

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Influence of wood dust fillers on the mechanical, thermal, water absorption and biodegradation characteristics of jute fiber epoxy composites

Journal of Polymer Research ◽

10.1007/s10965-019-1975-2 ◽

2019 ◽

Vol 27 (1) ◽

Cited By ~ 15

Author(s):

S. Dinesh ◽

P. Kumaran ◽

S. Mohanamurugan ◽

R. Vijay ◽

D. Lenin Singaravelu ◽

...

Keyword(s):

Water Absorption ◽

Thermal Water ◽

Epoxy Composites ◽

Jute Fiber ◽

Wood Dust

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Effect of ink and paperboard characteristics on flexographic print quality based on print density

TAPPI Journal ◽

10.32964/tj10.9.7 ◽

2011 ◽

Vol 10 (9) ◽

pp. 7-13

Author(s):

KHODADAD MALMIRCHEGINI ◽

FARSHAD SARKHOSH RAHMANI

Keyword(s):

Water Absorption ◽

Significant Influence ◽

Particle Diameter ◽

Print Quality ◽

Printing Technology ◽

Plastic Films ◽

Printing Inks ◽

Packaging Industry ◽

Solids Content ◽

Density Results

Flexography is an evolving printing technology that is suitable for printing on coated and uncoated paperboard and board, nonporous substrates including metalized and paperboard foils, and plastic films used especially in the packaging industry. This study evaluated the effect of paperboard and ink characteristics on flexographic print density in paperboard. Three commercial paperboards from different companies were prepared: brown kraft from Thailand, white kraft from Spain, and test liner from Iran. Four samples of process print inks from Iran were used in this investigation. Paperboard properties, such as roughness and water absorption, and ink characteristics, including solids content, PH and particle diameter, were measured. The inks were printed on paperboards using a roll no.15 applicator with a blade metering device, and the print densities were measured. Results showed that solids content, pH, and particle diameter of printing inks influenced print density, while the roughness and water absorption of the three types of paperboard had no significant influence on print density. Results also illustrated that two levels of ink viscosity (25–30 and 50–55 mPa·s) were insignificant to print density.

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