Nanocomposites of crosslinked starch phthalate and silane modified nanoclay: Study of mechanical, thermal, morphological, and biodegradable characteristics

Abstract

Biodegradable composites comprising of modified starch and modified nanoclay have been prepared. Starch has been modified by esterification and subsequently crosslinked. The thermal, mechanical, and biodegradation characteristics of the composites have been investigated. The compressive properties of the composites with the addition of nanoclay were twice that of crosslinked starch phthalate without addition of nanoclay. Predictive theories were used to analyze the obtained experimental results. SEM studies on fracture morphology indicated quasi-brittle fracture. Flexural properties showed considerable improvement due to nanoclay addition. The water uptake increased up to 6% nanoclay, beyond which the uptake decreased. Biodegradation studies showed an initial time lag prior to the onset of degradation.

Effect of nano CdO-ZnO content on structural, thermal, optical, mechanical and electrical properties of epoxy composites

“…Firstly, increase in CdO-ZnO concentration might have reduced the reactive sites present in the composite leading to saturation of the nanofiller and hence the development of agglomeration of the molecules. These agglomerated molecules fail to resist compressive loads applied on the polymer composite [41]. Secondly, the localised stress that is created when compressive loads are applied might result in formation of inter platelets.…”

Fly Ash Epoxy Composites with Superior Fire Retardant Properties

“…Mechanical properties of fly ash epoxy composites were analyzed using Zwick Universal Testing Machine (UTM). Tensile properties were tested as per standard ASTM D638 [21] procedure and compressive properties were tested according to standard ASTM D695 [22]…”

A Review on Polysaccharide Based Nanocomposite Hydrogel Systems Fabrication Using Diverse Reinforcing Materials

“…Silane modified nanoclay when crosslinked with functionalized starch (starch phthalate) notably improve the compressive modulus and strength of hydrogel upto twice by the addition of nanoclay. The increase in the mechanical properties was due to interaction between the amine groups present on the nanoclay and the hydroxyl and ester groups present on the modified starch [88]. Zhang et al prepared superabsorbent hydrogels by graft polymerization of acrylic acid and AMPS (2-acrylamido-2-methyl propane sulphonic acid) onto xylan and montmorrilonite, an inorganic clay.…”

“…Polysaccharide based nanocomposite hydrogels have applications in the field of wound dressing [43,44,46,49,52,58,95,96], drug delivery [53,71,91,[97][98][99], tissue engineering [65,88,100], bioremediation of toxic metal ions and dyes [101][102][103], biosensors and photocatalysis.…”