A New Process of Preparing Rice Straw-Reinforced LLDPE Composite

Abstract

To reduce the pollution resulting from discarding waste plastic film and burning straw, a new method of preparing straw-reinforced LLDPE composites was developed to utilize these wastes. The straws were first laid parallel on an LLDPE film and then rolled up. The rolls containing long straws were laid into a mat and then hot-pressed into a long straw composite board (the mass of straw accounted for 60%). Slope-cutting the straw, grinding the straw, and twisting the roll were designed to improve the physical and mechanical properties of long straw composites. Among them, slope-cutting the straw combined with twisting the roll provided the best properties. Compared to the extruded straw particle composite, the composite prepared with the new method improved the tensile strength, bending strength, impact strength, and water resistance by 358%, 151%, 416%, and 81%, respectively. Slope-cutting exposed more inner surface at the end of the straw. Scanning electron microscope observations showed that the straw inner surface was more tightly bonded with the LLDPE matrix than the outer surface. Meanwhile, the integrity of the straw was retained as much as possible, and thus greatly improved the performance of the resulting composites. Dynamic mechanical analysis, differential scanning calorimetry, and thermogravimetric analysis show that the viscous deformation of the composites prepared by the new method was reduced and the rigidity was increased, and the combination of straw and LLDPE forms a dense composite material with good interfacial bonding. It greatly slowed down the degree of its pyrolysis.

Fabrication of LLDPE based biodegradable composite incorporated with leather shavings and buffing dust: An approach for waste management

“…The decreasing of Tm 2 for LB‐10 composite film than pure LLDPE film may be happened for the early denaturation of collagen contents in LB 4 . Similar thermal behavior was observed for LLDPE based composite films in previous studies 20,21,43 . The DSC thermo‐grams showed that the melting point of fabricated composite films were better than pure LLDPE film.…”

“…The complete degradation temperature of those composite films were slight lower than pure LLDPE film. The decrease of complete degradation temperature of composite films was due to the addition of leather fiber, which might be completely degraded earlier than pure LLDPE 9,21,43 . Thermal properties analysis are shown in Table 2.…”

“…Considering elongation at break, the prepared composite films showed higher percentage of elongation than almost all of the previously mentioned composites in Table 4. This may be happened due to better crystal structure of pure LLDPE than those previously used matrix 11,39,41–43 . Until date, several fiber‐based composites have been researched, but the use of leather fiber with LLDPE will open up a new dimension for composite fabrication, allowing for higher tensile strength and percentage of elongation at the same time, as well as other features.…”

Biocomposite Based on Polylactic Acid and Rice Straw for Food Packaging Products

“…RS can be utilized diversely, for example, in animal feed, as a substrate for mushroom cultivation, as biomass, and for biochar production [ 6 ]. Additionally, it can be mixed with polymers to produce various products such as automotive components, artificial wood, and composite films [ 7 , 8 , 9 , 10 , 11 , 12 ]. RS can help increase the strength of the polymer when it has an appropriate particle size and is mixed in proportion [ 13 , 14 , 15 , 16 ].…”

Influence of rice straw and wood fiber combination on physical and mechanical properties of rice straw pulverized composite board

“…A new process for the manufacture of straw-reinforcing thermoplastic composites study revealed that the structure improved the LLDPE matrix' s reinforcement. The Dynamic mechanical analysis, differential scanning calorimetry, and thermogravimetric analysis have indicated that the composites manufactured by the wrap and twist method reduced viscous deformation and increased rigidity (Xu et al 2022) .…”