SISAL

About: SISAL is a research topic. Over the lifetime, 1878 publications have been published within this topic receiving 55528 citations.

Method for conducting auxiliary microwave heating and high-pressure degumming on sisal hemp leaves

Abstract: The invention discloses a method for conducting auxiliary microwave heating and high-pressure degumming on sisal hemp leaves. The method comprises the following steps of: removing moisture in the sisal hemp leaves; placing the dehydrated sisal hemp leaves in a reaction vessel, adding sodium hydroxide solution and sealing the reaction vessel; conducting microwave heating on the reaction container containing the sisal hemp leaves and the sodium hydroxide solution; and taking out and washing the sisal hemp leaves from the reaction container by clear water, and removing slag to obtain sisal hemp fiber. The temperature, needed by degumming, of the solution can be achieved within short time by adopting auxiliary microwave heating; and the sealed reaction vessel can generate high pressure in heating, thus being capable of enabling the solid gum on the sisal hemp leaves to be quickly detached from a solid fiber interface. Due to adoption of higher temperature and pressure, the sisal hemp leaves can be degummed within shorter time so as to obtain fiber in leaves. With the adoption of the method, the content of fiber in the sisal hemp leaves can be accurately determined, the determination speed is high, and the method plays an important role in the aspects of purchase, culture management, sisal hemp fiber machining and the like of the sisal hemp leaves.

Effect of fiber loading on flexural strength of hybrid sisal/hemp-HDPE composites

Abstract: The continuing demand for sustainable materials and increasing environmental concerns have led to intense research in the field of natural fiber reinforced composites. Natural fibers are favored over synthetic fibers as reinforcement due to positive environmental benefits such as raw material utilization at source and easy disposable of the biodegradable fiber. In the present work, we have investigated flexural behavior of hybrid natural fiber reinforced HDPE composites. The matrix comprises of 50-50 ratio of virgin and recycled HDPE and the content of fibers (sisal and hemp) in the composite is varied from 10 to 30%. The natural fibers were mercerized with NaOH solution and chemically treated with maleic anhydride. The flexural specimens were prepared by injection moulding process and the testing was conducted in accordance to ASTM D790 standards. It is revealed that the flexural strength of the hybrid composite increases with the increase in fibers content when compared to specimen containing 100% HDPE.

Studies on Mechanical Properties and Morphology of Sisal Pulp Reinforced Phenolic Composites

Abstract: Based on renewable cellulosic resource, sisal pulp (SP) was prepared from wasted sisal fiber (SF) by the sulfate pulping method. The impact of the content of SP on the mechanical properties of phenolic composites was studied. For comparison, the reinforcement effect of SF, aramid pulp (AP), and glass fiber (GF) was studied. The microscopic structure and properties of the composites were characterized by polarized optical microscopy (POM), scanning electron microscopy (SEM), Dynamic thermomechanical analysis (DMA), and mechanical testing. Results show that the flexural strength and impact strength of SP-reinforced phenolic composites maximized at 125.6 MPa and 11.09 kJ/m2, respectively, with 25wt% of SP. Compared with SF-, AP-, and GF-reinforced phenolic composites, the flexural strength of SP-reinforced phenolic composite has increased by 76.41, 25.35, and 14.29%, respectively, and impact strength increased by 49.26, 65.03, and 132.01%. POM illustrates that SP, SF, and AP subjected to a large shear during the roll milling process, and thus the fibers are cracked into finer microfibers. The results indicate that those microfibers and interfacial interaction affect reinforcement effect significantly.