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Новости/Аналитика

Biocomposites hemp (Part 2)

05.08.2016

Hemp fiber technologists are well known throughout the world for their tensile strength, in particular fiber female plants - materki. Biocomposite based on hemp surpassed their natural competitors for force tensile strength and impact resistance.
 
Plastic composites based on hemp
 
Plastic composites include a polymer matrix which can be based on different cellulose or other natural or synthetic polymers and reinforcing fibers which may be natural (composed mainly of cellulose) or synthetic. Among the natural polymers used various types of mountain (asphalt), natural (shellac) and wood resins or various elements of wildlife (tortoise shell). As a natural fiber reinforced natural fiber used jute, sisal, cotton, hemp and flax. The inorganic fillers include talc, mica and fiberglass.
 
It generally refers biocomposites composite comprising at least one primary organic component. Although it is possible to produce 100% organic bioplastic, most of biocomposites contain some amount of synthetic components. Often natural fibers mixed with synthetic polymer and the resultant product will be referred to as biocomposite. Various combinations of fibers and polymers are used to create bioplastics vary considerably in terms of their density, tensile strength, as well as other characteristics which must be complied with during the manufacturing process, creating products and materials used in various fields of economic - Materials for construction and public works, furniture, musical instruments, boats, panels of car bodies, biodegradable grocery bags, and even in the medical field. For example, organic biocomposites made in recent years bone substitutes that are actively used in traumatology.
 
Hemp fiber technologists are well known throughout the world for their tensile strength, in particular fiber female plants - materki. Hemp fibers are thinner, softer and often longer materki, but at the same time are less important resistance at the gap. Conducted in 2003, the study of polypropylene reinforced with natural fibers of hemp, kenaf and sisal have demonstrated that their tensile strength was comparable with conventional composite materials reinforced with fiberglass. In addition to the hemp-based biocomposite surpassed their natural competitors for force tensile strength and impact resistance.
 
Research conducted in 2006 demonstrated that in almost all the main characteristics of biocomposite materials reinforced with hemp fiber identical composites, reinforced with fiberglass.
 
Experiments were carried out in 2007 with a biocomposite materials reinforced with hemp fibers showed that the biocomposite of maleate polypropylene increases tensile strength and overall mechanical properties of the final material and reaches 80% of the technical characteristics of conventional composite materials based on glass fibers.
 
100% biocomposites of hemp
 
Various materials have been developed biokompozionye entirely from organic materials. Some of them use cannabis as a filler. In 2003, researchers at the tensile strength hemp fiber rupture found that if the plant is treated with a dilute solution of sodium hydroxide at a concentration of 4 to 6%, the fibers are much better resisted breaking force. In addition, significantly increases the stiffness of hemp fibers impregnated with a liquid made of the cashew nut shell in combination with a standard resin matrix.
 
In 2007, Korean scientists announced the discovery of a biocomposite material made of polylactic acid, organic, hemp fiber reinforced. The researchers found that the processing of hemp fibers with an alkaline solution of low concentration increases their durability and resistance to tensile forces. These materials showed a biocomposite strength and increased stiffness in comparison with the plastic, made solely on the basis of synthetic components.
 
In 2009, researchers at Stanford University announced the development of a composite material reinforced with hemp fiber, made from biopoligidrooksibutirate - derived from Mycobacterium exposed to various biological stress, such as nutrient deficiencies. This biocomposite are extremely durable, soft and commercially attractive for use in construction, furniture and flooring.
 
100% organic polyethylene terephthalate
 
Of plastics resins may be composed of a single molecule, whereas the composite plastics include the addition of one or more pitches, so that the fibers stick together and take the shape of a final product. Bioplastics are made from many different materials from which it is possible to produce various bioplastics, even totally organic biocomposite materials.
 
In 2011, the horn company PepsiCo announced production of the original plastic bottle for 100% made of polyethylene terephthalate - thermoplastic polymer resin, the chemical formula of which is usually made of chemical raw materials, however in this case the polyethylene is obtained from a variety of plant sources, including various grasses, pine bark or corn husk.
 
However, bottle 100% bioplastic not currently available for manufacturing, though other manufacturers and PepsiCo beverage bottles contain only beginning of bioplastic, including Coca-Cola, has sold 2.5 million works hemp "PlantBottle" in during the first two years of production, that is 68 million kilograms of bottles of biocomposite materials. Companies promoting this initiative indicate that their goal is to provide 100% of the number of bottles of biocomposite materials by 2018.
Author: 
Alexander Ignatyuk
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