bakelite structure class 12

Posted by Himanshi Ranjan 9 months, 3 weeks ago, Vidhu Choudhary These polymers have many cross-linking bonds that give rise to a network-like structure. Unit XVI: Chemistry in Everyday Life (Periods 8) 1. Ex: polythene, nylon 6,6, bakelite, rubber, etc. At elevated temperatures (> 335 K), it becomes even softer. :7�c�ӓ��Q�1.��K�څ���w�T�iD�я���t^@#M��>�* }�p�7��5�׃ 9d�D;R��p���y�x�����rD6���҅��1E���{�}�2���LP�`� ������M x��e�ΥCT���9��� ��� �2`�X��>7��M&%�Zcc��D~?S�aj3;�H�}�{8})�;ؼ��D��cx�v��H���+�$���>��[/��c�K��%��v������K�M?YM9�[Gd9%ls�)I�R�,�Y��I(/`|°W�����o%B! (ii) Nylon 6, Neoprene, Polyvinyl chloride. Zigya App.

Answer . What are the monomers and structure of PHBV? nCH2 = CH- CH =CH2 + n C6H5CH=CH2 à (-CH2-CH=CH-C6H5-CH2-CH-CH2-) n, 1,3 – Butadiene               Styrene                  Butadiene-styrene copolymer, Define the terms: Monomers, Polymers & Polymerization, Preparation of Important Addition Reaction. Thermosetting polymers are cross-linked or heavily branched polymers which get hardened during the molding process.

text-transform: none; Polymerization is the process of forming high molecular mass (103 − 107 u) macromolecules, which consist of repeating structural units derived from monomers. The polymers made by addition polymerisation from two different monomers are termed as copolymers, e.g., Buna-S, Buna-N, etc.

Question 15.1: What are polymers? They can be depicted as: For e.g., high density polythene (HDP), polyvinyl chloride, etc. <> Switch; Flag; Bookmark; Write the names of monomers of the following polymers: Hexamethylene diamine and adipic acid. 3. Arrange the following polymers in increasing order of their intermolecular forces. A hard, infusible, and chemically resistant plastic, Bakelite was based on a chemical combination of phenol and formaldehyde (phenol-formaldehyde resin), two compounds that were derived It has low tensile strength and low resistance to abrasion. V1�5��R����L�l"V�`䎊3�r�n�ˠ�Gw�\��11�&�.��*�b $����8�k@��Mo���#���I����s���m��Hf)�����8����56��C�c�uI(���� ���R�����,�7�۝���\�O��OW������/s �r��T���G���u��aY��c2 ���SQ`�8k+k� k�R�m-ŕ�Ȓ1�I9���V. Write the monomers used for getting the following polymers. Class- XII-CBSE-Chemistry Polymers Practice more on Polymers Page - 2 www.embibe.com bonds between various linear polymer chains. Plz give me all methods for preparation of 9 months, 3 weeks ago, Nitya Saini [�m�!^�]/-\X��� ���?D���y7��2��MN={ea�.yU��}YA���ڻy��=5E��':Vo.u�VQ=��׸�����M6� 9�M���J�ya�r�i�Qy�W};^� y��RP���gW� j���t�[��o���w����ˤL����{1�d����\�Ȋa�� �1cVms�o�14y�����F}@SӇ��8��r!�U=�_+���߼����^�(���'�o��H�5�|�D�T[J�_}��N5뉹��ӰX��G (�� font-size: 14px;

Fibres are the thread forming solids which possess high tensile strength and high modulus.

9 months, 3 weeks ago. Examples include polythene, polystyrene. Because of this cis-configuration, intermolecular interactions between the various strands of isoprene are quite weak. b) Cellulose derivatives as cellulose acetate (rayon) and cellulose nitrate, etc. These polymers are cross linked or heavily branched molecules, which on heating undergo extensive cross linking in moulds and again become infusible. Here we have given NCERT Exemplar Class 12 Chemistry Chapter 14 Biomolecules. Examples of thermosetting plastics include bakelite, urea-formaldehyde resins. !�c�A�Z{�TJ�cBd�6��eJ�wH��; ��_�0��. On the basis of magnitude of intermolecular forces present in polymers, they are classified into the following groups: How can you differentiate between addition and condensation polymerisation?

Polymers bakelite and Melmac are two examples of Cross-linked polymers. These cannot be reused. /-��C�7c]��VF��v_U��;]����_j��~�����M'D��T�Z� ���� C

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Thus, to maintain its elasticity, natural rubber is generally used in the temperature range of 283 K-335 K. 2. Zigya App. PHBV is known as Poly(3-hydroxybutyrate-co-3-hydroxyvalerate. These polymers are basically linear chain polymers with some branches. Plastics have intermediate intermolecular forces of attraction. Alcohol Polymers have a high molecular mass (103 − 107 u).
3-hydroxybutanoic acid and 3-hydroxypentanoic acid is monomer of PHBV. }

Examples include protein, cellulose, starch, etc. Addition polymerization is the process of repeated addition of monomers, possessing double or triple bonds to form polymers. In these polymerisation reactions, the elimination of small molecules such as water, alcohol, hydrogen chloride, etc. are the some examples.

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