Copolymers: Polymers whose repeating units are derived from two or more types of monomer molecules are called co-polymers. Polymer, any of a class of natural or synthetic substances composed of very large molecules that are multiples of simpler chemical units. Bakelite is another … II. Due to their broad spectrum of properties, both synthetic and natural polymers play essential and ubiquitous roles in everyday life. (ii) Linear slightly branched long chain molecules. Hence the name glassy state. Login. View Answer. The condensation polymer among the following is. The more highly-ordered chains in the stretched conformation are entropically unstable and return to their original coiled state when allowed to relax (click a second … This temperature is called which one of the following: (a) freezing point, (b) glass transition temperature, (c) melting temperature, or (d) recrystallization temperature? True. Now, when the polymer is heated, the polymer chains are able to wiggle … Which … PVC. B) the most sustainable approach is to use renewable resources, especially non-food crops, as a monomer source. ← Prev Question Next Question → 0 votes . हमारी आजादी की लड़ाई में समाज … sbasanti039 sbasanti039 Answer: all are correct answer . 1 answer. New questions in Chemistry. Quiz Flashcard. [NCERT Exemplar] (a) Teflon (b) Natural rubber (c) Neoprene (d) Polystyrene 1 See answer fathimao6171 is waiting for your help. Thermosetting polymers : These are semifluid substances with low molecular masses which when heated in a mould, undergo change in chemical composition to give a hard, infusible and insoluble mass. Artificial silk is derved from cellulose. 1) PMMA is called Plexiglas … A wide variety of synthetic polymers are available with variations in main chain as well as side chains. - wherein. View Answer. Please complete to the best of your ability. Solution: Option (i) is the answer. Sequential Easy First Hard First. True. Add your answer and earn points. At 25 to 35% crosslinking a rigid hard rubber product is formed. The polymers are exactly made of carbon atoms bonded together, one to the next, into large chains that are called the backbone of the polymer. Plasticizers are chemicals added to a polymer to make it softer and more flexible and to improve its flow characteristics during forming. Question 35. 15.34 For each of the following pairs of polymers, do the following: (1) state whether or not it is possible to determine whether one polymer has a higher melting temperature than the other; (2) if it is possible, note which has the higher melting temperature and then cite reason(s) for your choice; and (3) if it is not possible to decide, then state why. Which of the following polymer can be formed by using the following monomer. Crystalline: (quite rigid, good synthetic fibers)-polyamide … II. The basic property that separates a thermoplastic polymer from a thermosetting polymer is the polymer’s response to being heated. (ii) Hard (iii) Poor conductor of electricity (iv) Highly branched structure Solution: Option (iii) is the answer. The following illustration shows a cross-linked section of amorphous rubber. The glassy state is similar to a super cooled liquid where the molecular motion is in the frozen state. Acrilan is a hard, horny and a high melting material. Elastomer, any rubbery material composed of long chainlike molecules, or polymers, that are capable of recovering their original shape after being stretched to great extents—hence the name elastomer, from “elastic polymer.”Under normal conditions the long molecules making up an elastomeric material are irregularly coiled. Synthetic polymers are human-made polymers, often derived from petroleum oil. B. protein. (iv) Soften on heating and harden on cooling, … D. A … Linear PDMS polymers are generally viscous liquids or grease-like jellies. These cannot be re-melted. Thermosetting Polymers - They are highly cross - linked, hard, infusible and insoluble polymers.They cannot be reused. Carbon black Rosin Phosphorous Pine oil. Answer. asked Aug 16, 2018 in Chemistry by Sagarmatha (54.4k points) polymers; cbse; class-12; 0 votes. Which of the following polymers can be made by condensation polymerisation reaction? Solution: Option (ii) is the answer. The straight chain polymer is formed by : MEDIUM. Match the column I with … Which one of the following statements is not true? (ii) Linear slightly branched long chain molecules. (a) Acrilan (b) Nylon (c) Polystyrene (d) Neoprene. Option 3) Buna-N. Option 4) Bakelite. (i) Dacron (ii) Buna-S (iii) Neoprene (iv) Novolac; Which of the folloiwng are characteristics of thermosetting polymers? Since these shorter chains can interfere with efficient packing of the polymers, branched polymers tend to be less dense than similar linear polymers. (i) Heavily branched cross linked polymers. 7. is a polymer having monomer units _____. View Answer. (a) Buna-S is a copolymer of butadiene and styrene. What is a Polymer? Nylon-66 is an example of elastomer. (i) Heavily branched cross linked polymers. HARD. 3.1k views. It has highly branched structure. There are polymers that have only carbon and hydrogen atoms. Which of the following is a linear polymer? HARD. 8. Option 1) PVC. As temperature continues to decline a temperature is reached at which the material becomes hard and brittle. View Answer. Which one of the following represents its structure? Increasing the temperature induces molecular motion resulting in the typical rubber-elastic properties. Polynucleotides, such as RNA and DNA, are long … Copolymers The polymers which are obtained by the polymerisation of two or more monomers are called copolymers (ii) Condensation polymers The polymers which are formed by the combination of monomers with the … 35. As temperature continues to decline a temperature is reached at which the material becomes hard and brittle. What are the polymers with this property. Thermoplastics are (A) Linear polymers (B) Soften or melt on heating. The factors that influence a polymer's tendency to crystallize are the following: (1) only linear polymers can form crystals; (2) copolymers do not form crystals; (3) stereoregularity - isotactic polymers always form crystals, atactic polymers never form crystals, and syndiotactic polymers sometimes form crystals; (4) slow cooling from the molten states promotes crystal formation; (5) plasticizers inhibit crystal … Heat resistance is usually given for … Solution: Option (iv) is the answer. A small molecule made of one atom. Teflon Dacron Melamine resins None of these. Remember. Proteins are the condensation polymers of α-amino acids. When the thermoplastic polymer is heated, it melts, softens, and can be reformed when cooled. This quiz is open notes, open web. With the application of force, however, the molecules straighten out in the direction … Amongst the following, the branched chain polymer is 1) PVC 2) Polyester 3) Low density polythene 4) Nylon-66 11. In polymer chemistry, when a synthetic polymer is said to be "cross-linked", it usually means that the entire bulk of the polymer has been exposed to the cross-linking method. (d) Natural rubber has the trans configuration at every double bond. A common method to form true gels and elastomers is to copolymerize a small fraction of vinyl methyl siloxane units (Figure 3 (b)) into the PDMS polymer … Which of the following is a thermosetting polymer? Answer. A polymer (/ ˈ p ɒ l ɪ m ər /; Greek poly-, "many" + -mer, "part") is a substance or material consisting of very large molecules, or macromolecules, composed of many repeating subunits. From the utility point of view they can be classified into three main categories: thermoplastics, elastomers and synthetic fibers. In this state, the polymer is brittle, hard and rigid analogous to glass. Intermediate cross-link densities transform gummy polymers into … Which of the following polymers are thermoplastic? Below their glass transition temperature, amorphous polymers are usually hard and brittle because of the low mobility of their molecules. (a) Isotactic polystyrene that has a density of 1.12 g/cm3 and a … Multiple Choice Questions (Type-II) Note: In the following questions two or more options … unit? -Neoprene: Used in surgical and dental gloves due to its flexible nature. Plastic tubes & pipes are generally made by _____ moulding … It is used for various applications to seal hard boards as well ... PDMS, depending on the synthesis conditions, can be made into a viscous fluid, a soft gel, or a hard elastomer. Polymers whose repeating structural units are dervied from only one type of monomer units are called homopolymers. Others are hard and tough, like epoxies and glass. A long chain molecule made of many smaller molecules called monomers. Which of the following is not a condensation polymer? The resulting modification of mechanical properties depends strongly on the cross-link density. Which of the following is the most important rubber compounding ingradient which is used to improve wearing qualities of both natural rubber & SBR by imparting toughness ? (iii) Become infusible on moulding so cannot be reused. Start. Question 24. cis-Polyisoprene possesses elastic property because (a) It is soft and soluble in non-polar solvent (b) It is unsaturated and porous (c) It has a coiled structure and chains held together by weak van der waals forces (d) It has fibrous … Answer: (b) Nylon. Which of the following polymers, need atleast one diene monomer for their preparation? Which of the following polymers belong to the class of formaldehyde resin ? We can attach one or more other atoms to each carbon atom in the backbone chain. Which of the following polymers, need atleast one diene monomer for their preparation? It is worth a regular Quiz grade. 1. (iv) Soften on heating and harden on cooling, … 1) Nylon 2) Bakelite 3) Alkyd resin 4) Melamine-formaldehyde polymer 10. Since the short chains do not bridge from one longer backbone to another, heat will typically break the bonds between the branched polymer chains and allow the polymer to be a thermoplastic, although there are some very complex branched polymers that … Question 7. Questions and Answers . 1 answer. asked Dec 22, 2018 in Polymers by Bhavyak (67.3k points) … Q7) As the temperature of an amorphous polymer decreases from the liquid state, the polymer changes from liquid to rubbery. Low cross-link densities increase the viscosities of polymer melts. asked May 3, 2019 in Polymers by Aadam (71.9k points) polymers; jee; jee mains; 0 votes.
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