The appearance of synthetic fibers has made important contributions to the beautification of people's lives, and has greatly changed our lives. However, due to the fact that the composition and structure of synthetic fibers are difficult to biodegrade, people who wear old clothes cannot naturally degrade into rubbish like mountains. Fishing nets and fishing lines made of synthetic fibers and lost to the sea after discarding ropes have caused considerable damage to marine life (such as sea birds, sea turtles, and sea dogs). Therefore, the production of biodegradable synthetic fibers has become the focus of current fiber science research.

Degradable fiber refers to fibers that are self-degrading under the influence of light, heat, and microorganisms in nature. At present, aliphatic polyester fibers with good biodegradability can be developed into hot spots.

Polyhydroxyalkanoate fiber

Polyhydroxyalkanoates (PHAs) are substances that store the carbon source and energy of prokaryotic microbial cells. When the microorganisms are in an unbalanced, unbalanced nutrient environment, they are mass-produced and stored as PHA, an aliphatic polyester. The PHA synthesized by microorganisms is a kind of highly crystalline thermoplastic material, which is similar to the physicochemical properties of polypropylene and polyethylene, and can be used for drawing, laminating, injection molding, and the like.

PVA has excellent biocompatibility, optical activity, piezoelectricity, moisture resistance, low gas permeability and other properties. Its fibers are used as medical materials, such as wound support materials, surgical sutures, hemostatic balls, wound dressings, etc. Hygiene products, agricultural materials such as fishing nets, etc. PHA is stable under normal conditions, but is easily biodegradable in natural environments such as soils, lakes, and oceans.

Polyhydroxybutyrate (PHB is the most widely found and the earliest high-crystallinity (80%) biodegradable polyester in PVA, its properties and structure are similar to that of polypropylene. Due to its high crystallinity, the fiber is brittle. Poor tensile properties, difficult processing and forming.PHB's melting temperature (179 °C), decomposition temperature (200 °C), its poor thermal stability, and PHB chemical stability is also poor, which affects PHB to some extent Practical application: For this purpose, British ICI and Japan's Monsanto have developed random copolymers of 3-hydroxybutyric acid and 3-hydroxyvaleric acid.

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