Assertion (A) Polyamides are best used as fibres because of high tensile strength.
Reason (R) Strong intermolecular forces (like hydrogen bonding within polyamides) lead to close packing of chains and increase the crystalline character, hence, provide high tensile strength to polymers.
Assertion (A) For making rubber synthetically, isoprene molecules are polymerised.
Reason (R) Neoprene (a polymer of chloroprene) is a synthetic rubber.
Assertion (A) Network polymers are thermosetting.
Reason (R) Network polymers have high molecular mass.
Assertion (A) Polytetrafluoroethene is used in making non-stick cookwares.
Reason (R) Fluorine has highest electronegativity.
Synthetic polymers do not degrade in the environment for a long time. How can biodegradable synthetic polymers be made. Differentiate between biopolymers and biodegradable polymers and give examples of each type.
Synthetic polymers are quite resistant to environmental degradation process and are responsible for accumulation of polymer solid waste material. New biodegradable synthetic polymers have been designed and developed. These polymers contain similar functional groups as present in biopolymers.
e.g., aliphatic polyesters
Biopolymer, are polymers of amino acid or carbohydrates which are linked to each other by peptide or glycosidic linkages as shown below
Biopolymer can or can't be biodegradable.
e.g., protein, starch etc, are biodegradable but keratin are non-biodegradable. Biodegradable polymer are polymers which can be degradable always. e.g., DHBV nylon-2, Nylon-6