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what is the meaning of polymer in hindi
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Stereochemistry in polymers refers to the spatial arrangement of atoms within the polymer molecules, particularly focusing on the configuration and conformation of monomeric units. This aspect is crucial as it directly influences the physical and chemical properties of the polymers, such as melting point, solubility, and mechanical strength. There are several types of stereochemistries in polymers, including isotactic, syndiotactic, and atactic arrangements, which describe the relative positioning of substituent groups along the polymer chain. Isotactic polymers have the same spatial arrangement of substituents along the chain, leading to highly crystalline structures. Syndiotactic polymers have substituents alternating sides, offering a semi-crystalline structure, whereas atactic polymers have random arrangements, resulting in amorphous materials. The control of stereochemistry is vital in polymer synthesis for tailoring the properties of polymers for specific applications.
Polyvinyl alcohol (PVA) is a synthetic polymer used in a variety of applications from packaging films to eye drops, due to its water-soluble and biodegradable properties. Generally, PVA is considered non-toxic and is not harmful when used in consumer products under normal conditions. It has been approved for use in various medical and food contact applications, indicating its safety for human contact. However, as with many materials, excessive ingestion or inhalation of its powdered form can cause irritation to the respiratory tract or digestive system. Direct skin contact with PVA in its monomeric form can also cause irritation, though this form is rarely encountered by consumers. Overall, PVA is deemed safe for its intended applications, but standard handling procedures should be followed to avoid potential irritations.
A resin coating refers to a layer of resin material applied over surfaces to protect them, enhance durability, or improve aesthetics. Made from either synthetic or natural resin, these coatings can be used on floors, wood, artwork, and other materials. Synthetic resins, like epoxy, polyurethane, and acrylic, are popular for their strength, chemical resistance, and versatility. Natural resins, such as shellac, are valued for their organic qualities and traditional finish. Once applied, the resin cures to form a hard, protective shell that is waterproof, scratch-resistant, and capable of resisting various environmental factors. Resin coatings are favored in industries for flooring, automotive finishes, and marine applications, as well as in handicrafts and DIY projects due to their glossy finish and protective qualities.
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