Studies on thermal behavior, moisture absorption, and biodegradability of ginger spent incorporated polyurethane green composites

Abstract

Ecological concern on accumulation of neutraceutical industrial waste material and the demands for newer composite materials have promoted extensive research on utilizing industrial wastes materials. Therefore, in the present study finely powdered ginger spent (GS), filled polyurethane (PU) green composites with varying amount viz., 0, 2.5, 5, 7.5, and 10 wt % of GS have been fabricated. The prepared PU/GS green composites have been characterized for their mechanical properties, density and void content. Interaction between filler and matrix has been confirmed from Fourier transform infrared spectroscopy studies. Moisture absorption and desorption studies have been performed at different relative humidity (RH). The moisture absorption and desorption studies, shows that as the hydrophilic GS content increases in the matrix the RH also increases. Water uptake behavior of PU/GS were measured in different chemical environments such as 5% sodium chloride solution, cold water at different temperature and in hydrochloric acid solution. The water uptake values increases as increase in GS concentration. Equilibrium water content, diffusivity and equilibrium time taken for all PU/GS composites have been investigated. Biodegradation studies reveals that as the GS content increases the weight loss also increases. Thermal properties have been performed using differential scanning calorimetry (DSC) and dynamic mechanical analysis (DMA). From DSC and DMA thermograms it is revealed that increase in T g with increase in GS content. RH and contact angle measurement have been performed to understand the hydrophilic nature of the prepared composite. The morphological behavior of composites has been studied using scanning electron microscopy.

Processing, mechanical and thermal behavior assessments of polycaprolactone/agricultural wastes biocomposites

“…This shortcoming was arising from the treatment of some fillers applied for removal of proteins and sugars from the BSG. Recently, green composites based on polyurethane and ginger spent were prepared where a significant rise in the mechanical properties was reported with respect to neat polyurethane upon addition of 2.5-7 wt.% of ginger spent to the polyurethane (Chethana et al, 2015). This was ascribed to the sufficient adhesion at the matrix-filler interface.…”

Evaluation of Mechanical, Thermal, and Morphological Behaviors of Polyurethane/Mahua Seed Cake Green Composite

“…Hence, tensile behaviors of PU/MSC composites reduce significantly for higher dosage of filler loading. The dispersion of MSC fillers in PU matrix impedes the propagation of cracks along the loading direction . This leads to enhancement in tensile strength and tensile modulus of the composites.…”

“…and Chethana et al. for PU systems . In general, the increase in T g of the composites indicates the presence of strong physical interaction or hydrogen bond formation between matrix and dispersed MSC filler, which restricts the free motion of the polymer chains …”

“…The dispersion of MSC fillers in PU matrix impedes the propagation of cracks along the loading direction. 24 This leads to enhancement in tensile strength and tensile modulus of the composites. Incorporation of MSC into PU matrix was found to decrease the percentage elongation at break.…”

Synthesis and Characterization of Xylan Grafted with Polyethylene Glycol in Ionic Liquid and Their Use as Moisture‐Absorption/Retention Biomaterials

“…Moisture‐absorption/retention is an important parameter that indicates the polymer interaction with moisture . The moisture‐absorption/retention properties of xylan, mPEG 5K , mPEG 1K , and xylan‐ g ‐PEG with different DS were examined at a RH of 43% and 81% at 30 °C (Figure ).…”