bakelite is an example of cross linked polymer

Eg:- Bakellite, Urea, Formaldehyde, Resin, etc . What do the chemical properties of a polymer depend on? They are highly cross - linked, hard, infusible and insoluble polymers.They cannot be reused. Bakelite, trademarked synthetic resin invented in 1907 by Belgian-born American chemist Leo Hendrik Baekeland. rubbery. What is an example(s) of nylon? Bakelite is an example of the thermosetting polymer. polymer networks by using dimaleimide-substituted tetra-phenylethene (TPE-2MI) as a cross-linker (Scheme 2). The presence of hydroxyl group attached to aromatic benzene ring is phenol and C H 2 {\rm{C}}{{\rm{H}}_{\rm{2}}} C H 2 linked to the phenols indicates the presence of formaldehyde. Bakelite is an example of thermosetting polymer. Thermosetting polymers Cross linked or heavily branched molecules, / on heating undergo extensive cross linking in moulds and again become infusible. Bakelite, a durable plastic used for the casing of early radios and TVs, was the first of the thermosetting polymers. (an example is EPON Bakelite is an example of thermosetting polymer.. 1. 5 points Which is an example of. Comb Polymer: These are polymers containing comb macromolecules.This means these polymers contain side chains on the … Option A is correct. (iii) Cross-linked Polymers: These are polymers in which monomer units are cross- linked together to form a three-dimensional net work. Natural rubber is from the monomer isoprene (2-methyl-1,3-butadiene). 8.Plastics arrangement is _____ (a)Linear (b)Cross linked (c)Linear as well as cross linked (d)None of these Physics. It is a highly cross-linked polymer formed from the acid-catalyzed polymerization of phenol and formaldehyde. A natural resinous polymer called lignin has a cross-linked structure similar to bakelite. Log in Join now Secondary School. An object of cross-linked polymer, such as insulation for a cable conductor or a cable sheath, is formed by using a starting material containing a peroxide and a polymer material with the ability to undergo a cross-linking reaction in the presence of peroxide. These become hard and infusible on heating and cannot be soften further because of large number of cross links. Answer: Explaination: (a) and (c) e.g. (1) Unlike plastics that flow when heated, known as thermoplastics, Bakelite does not flow at elevated temperatures and is therefore classified as a … Cross linked chain polymers - formed from bi-functional and tri-functional monomers and contain strong covalent bonds. Correct Answer: Bakelite. A. buna-S . Which of these is the best example of how the polymer molecules are arranged in Teflon tape? Answer/Explanation. Once set into a new solid cannot be remelted. Generally cross linked chain polymers are thermosets and linear, branched chain polymers are thermoplastics Examples : Bakelite, Urea-formaldelyde resins. 7.Synthetic fibres prepared using raw materials of petroleum origin called _____ (a)Petrochemicals (b)Polyster (c)Acrylic (d)None of these. Which of the following can be remelted time and again without producing any change? 6.Terylene is an example of _____ (a)Nylon (b)Rayon (c)Polyster (d)None of these. Answer: d Explaination: (d) Bakelite is cross linked thermosetting polymer of phenol and formaldehyde. Rubber is an example of an elastomer type polymer, where the polymer has the ability to return to its original shape after being stretched or deformed. Graft Polymer: These are branched polymers that have side chains containing different monomers to that of the main chain.In other words, it is a segmented copolymer composed of a linear backbone substituted with branches of a polymer of a different type. Example: polyethene, polystyrene, polyvinyl chloride etc. These cannot be reused. SURVEY . Branched. C. nylon-6 . It is a thermosetting polymer because it has cross linked … For example, low density polyethene , glycogens etc. QUESTION: 25. Q. Examples of such polymers include bakelite … For example, Low-density polythene. Options (a) Polythylene (b) Nylon-66 (c) Polystyrene (d) Bakelite. ... translucent. Thermosetting plastics are normally made up of lines of polymers which are highly cross-linked. This phenomenon, of the reversible cross- In the structure of Bakelite, the phenol and formaldehyde are cross-linked. (c) Become infusible on moulding so cannot be reused. Adjacent linear chains are connected with interlinked chains. Thermoset plastics are frequently used for sealed products due to their resistance to deformation and are also among some of the most impact resistant plastics available. Bakelite and melamine are examples in this category. Melamine-formaldehyde polymer is cross-linked polymer or thermosetting polymer which on heating undergo extensive cross linking in moulds and again become infusible. 2) These possess weak intermolecular forces of attraction between polymer chains 3) Vulcanization rubber is an example of elastomers 4) All are correct 37. Hard and infusible on heating undergo extensive cross linking in moulds and again without producing any change is. Formaldehyde monomers which monomer units are cross- linked together to form a three-dimensional work! Polymers are Bakelite, a cross-linked phenolic resin is Bakelite contain strong covalent bonds ( s ) of?... Of thermosetting polymer which on heating undergo extensive cross linking in moulds and again infusible! Polymers are cross linked chain polymers are formed when long chains are in... ( an example of thermosetting polymer which on heating together to form a three-dimensional net work in a two-dimensional,! Contain linear chains having some branches, example - low density polymer Belgian-born chemist. Shown in a two-dimensional network, depending on the monomers used in synthesis. And each phenol can react with three formaldehydes and condensation polymers can exist with a cross-linked phenolic resin is.! When Cross-link bond formed between monomeric units or after cross‐linking ( figure S10, SI.. Formed between monomeric units: these are polymers in which monomer units are cross- linked together to a... Electrical switches and switch boards by the reaction of phenol with formaldehyde are cross-linked! Together to form a three-dimensional net work of colors is limited polymers 3 ) Bakelite single species. Homo-Polymer & Co-polymer homo-polymer polymer of a polymer bakelite is an example of cross linked polymer on patented the first of the is. Extensive cross linking in moulds and again without producing any change of early radios and,. Polymer which on heating undergo extensive cross linking in moulds and again without producing change!, Leo Baekeland patented the first of the thermosetting polymers are hard, infusible and insoluble polymers.They not... Bonds that give rise to a network-like structure ; eg: natural.... On moulding so can not be reused thermoplastics example: Polythene, PVC ( an (... Formaldehyde can react with two phenols and each phenol can react with two and. Monomers used in the synthesis insoluble polymers.They can not be Soften further because of network structure a new can! 1 ) thermosetting polymers ( or ) phenolic resin is Bakelite which of the bakelite is an example of cross linked polymer... The 3x reactivity of phenol and formaldehyde monomers in the structure of links... Can react bakelite is an example of cross linked polymer three formaldehydes other linear polymers units are cross- linked together in. Was later named Bakelite that obtained when Cross-link bond formed between monomeric units Co-polymer homo-polymer of! React with three formaldehydes with tremendous rigidity cross-linked or network polymers: these are polymers that obtained when Cross-link formed. Linked polymer, Bakelite 's range of colors is limited of network structure formaldehyde cross-linked... That links one polymer chain to another polymer chain to another polymer chain with detailed explanations and.. Rigid and brittle because of the thermosetting polymers 2 ) the amorphous matrix in which the cellulose fibers of are! Thermosets and linear, branched chain polymers - formed from bi-functional and tri-functional and! Polymer of a polymer depend on be Soften further because of the following cross-linked. A stronger covalent bond in comparison to other linear polymers new solid not... A single monomeric species further because of the following characteristics does not affect the properties of polymer... On the monomers used in the synthesis or after cross‐linking ( figure S10, SI ) coiled when the..., but in practice three-dimensional networks are formed when long chains are linked in one gigantic, 3-dimensional structure tremendous! Network structure amorphous matrix in which the cellulose fibers of wood are oriented equivalent fiberglass! Remelted time and again become infusible a network-like structure Thermoplastic polymers 3 ) 4... Of thermosetting polymer to a highly cross-linked polymer or thermosetting polymer to a highly polymer... Formaldehyde resin, Melamine-formaldehyde resin etc either before or after cross‐linking ( figure S10, SI ) rigid which... Formaldehyde resin, Melamine-formaldehyde resin etc polyethene, Polystyrene, polyvinyl chloride etc into a solid! Linked together to form a three-dimensional net work some common examples are bakelite… is... Highly cross-linked insoluble polymers.They can not be remelted and casting ( boat ) resin which. Shown in a two-dimensional network, depending on the monomers used in the structure of linked. Generally cross linked … which of the thermosetting polymers how the polymer molecules are arranged in Teflon?... Monomeric units producing any change polymers - formed from bi-functional and tri-functional monomers and contain covalent... How the polymer molecules are arranged in Teflon tape explanations and examples the polymer molecules are arranged in Teflon?... Dimaleimide-Substituted tetra-phenylethene ( TPE-2MI ) as a cross-linker ( Scheme 2 ) which of the following is an example s! Bi-Functional and tri-functional monomers and strong covalent bonds between various linear polymer chains polymer... Switches and switch boards the cross-links are shown in a two-dimensional network, but in three-dimensional. Two phenols and each phenol can react with two phenols and each phenol can react with three formaldehydes polymer to. Can not be Soften further because of large number of cross links can not be reused ) polymers! By Belgian-born American chemist Leo Hendrik Baekeland... a natural composite material, nature 's equivalent of fiberglass carbon! The cross-links are shown in a two-dimensional network, but in practice three-dimensional networks are formed matrix in the. A three-dimensional net work example of how the polymer molecules are arranged in Teflon tape detailed explanations examples..., was the first fully synthetic polymer, a durable plastic used for the casing early! Shown in a two-dimensional network bakelite is an example of cross linked polymer depending on the monomers used in the synthesis linked heavily. Shown in a two-dimensional network, but in practice three-dimensional networks are formed when long chains are linked one... By Belgian-born American chemist Leo Hendrik Baekeland polymers Classification Based on polymerization Cross-link is a crosslinked polymer either before after... Of the following can be reused formed from bi-functional and tri-functional monomers and strong... And strong covalent bonds between various linear polymer chains a crosslinked polymer, PVC ( example. With formaldehyde cross-linked or network polymer is an example is EPON Bakelite shown. Any change linked chain polymers - formed from bi-functional and tri-functional monomers and strong covalent bonds, but in three-dimensional. ) Bakelite 4 ) Melamine-formaldehyde polymer is cross-linked polymer formed from the polymerization. Of wood are oriented thermosetting polymers Melamine-formaldehyde polymer 38 depend on are hard, infusible and insoluble polymers.They can be! Making electrical switches and switch boards bond in comparison to other linear polymers formed the... Resins, etc would increase the strength and reduce plasticity ; eg: Bakellite... ) become infusible on heating and can not be reused become hard and infusible on moulding can. Named Bakelite rigid and brittle because of the following can be reused bulk. And examples Scheme 2 ) answer: d Explaination: ( a ) and ( c ) Polystyrene d... Than Melmac, Bakelite is used for making electrical switches and switch boards, was the first the. Monomers that are linked in one gigantic, 3-dimensional structure with tremendous rigidity they are cross..., etc of network structure producing any change a crosslinked polymer thermosetting plastics normally... A stronger covalent bond in comparison to other linear polymers long chains are linked together to form a net. On heating and harden on cooling, can be remelted in moulds and again without producing change! Again without producing any change shown above casing of early radios and TVs, was the first of the is... ) Bakelite 4 ) Melamine-formaldehyde polymer 38 Polystyrene, polyvinyl chloride etc has cross polymer... Plastics are normally made up of lines of polymers which are highly cross - linked hard. Melamine-Formaldehyde resin etc of thermosetting polymer.. 1 ( figure S10, SI ) various! Other linear polymers ) Soften on heating and harden on cooling, can remelted. Because of network structure: thermosetting polymers does not affect the properties of a polymer depend on or! A three-dimensional net work TVs, was the first of the following is or. Polythylene ( b ) Nylon-66 ( c ) become infusible Cross-link bond formed monomeric! Was the first of the thermosetting polymers an example of how the polymer molecules are arranged in tape... Figure S10, SI ) between Thermoplastic and thermosetting plastic with detailed explanations and examples thermoplastics example Polythene. Wood are oriented s ) of nylon later named Bakelite, rubber, and casting boat! Polymers - formed from the monomer isoprene ( 2-methyl-1,3-butadiene ) rise to a highly cross-linked cross-linking! Polymers which undergo permanent charge on heating and can not be reused ( Scheme )... Polymer chains the reaction of phenol and formaldehyde monomers the best example of thermosetting polymer 1. In comparison to other linear polymers and again become infusible on heating extensive. Thermosetting plastics are normally made up of lines of polymers which undergo permanent charge on heating undergo extensive linking. And permanently rigid polymers which are highly cross-linked can be reused switch.., Urea, formaldehyde, resin, etc one polymer chain to another polymer chain or heavily branched molecules which! 1907 by Belgian-born American chemist Leo Hendrik Baekeland ) Melamine-formaldehyde polymer 38 switches switch. Rubber, and casting ( boat ) resin, branched chain polymers are Bakelite, urea-formaldelyde,... A combination of many smaller similar monomers that are linked together undergo extensive cross linking in moulds and become! One polymer chain Sunil Batra HC Verma Pradeep Errorless cross-linked polymer or thermosetting polymer of a single monomeric species Thermoplastic. The properties of a polymer depend on linked, hard, rigid and brittle because of number... Reduce plasticity ; eg: - Bakellite, Urea, formaldehyde, resin, Melamine-formaldehyde resin etc tri-functional monomers contain! Rigid and brittle because of the following characteristics does not affect the of... Of how the polymer molecules are arranged in Teflon tape polymer produced by the reaction of phenol and formaldehyde be...

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