Polymers 0.0 / 5 ? ChemistryChemistry in IndustryIGCSEEdexcel Created by: MegganCreated on: 24-09-13 21:41 What is a monomer? Small molecules that can be joined together to make longer chains (polymers) 1 of 17 What is polymerisation? When small molecules (monomers) react and join up with other molecules to form longer chains (polymers) 2 of 17 What is a synthetic polymer? Polymers, e.g. plastics, that can be shaped by heat or pressure 3 of 17 What sort of bonds do monomers in a polymer have? Covalent bonds 4 of 17 What is an addition polymer? Polymers made under high pressure where alkene monomers have broken their double bond to join up with other monomers 5 of 17 What is a repeat unit? Drawing part of the polymer that gets repeated to represent the thousands of molecules there would be in a polymer 6 of 17 What would the name of a polymer be if if came from a propene monomer? Poly(propene) 7 of 17 Name 3 different useful polymers: 1) Polyethene 2) Polypropene 3) Polychlorethene or Polyvinyl Chloride (PVC) 8 of 17 Uses of Polyethene: 1) Low Density Polyethene (LDPE) - plastic bags, weak and flexible 2) High density (HDPE) - drain pipes, rigid and strong 9 of 17 Uses of Polypropene: Suitcases, helmets - tough and easily molded 10 of 17 Uses of PVC: Rainwear clothing, window frames - tough and water resistant 11 of 17 Why are addition polymers hard to dispose of? They are not very biodegradable - do not decompose easily 12 of 17 What are the 3 main ways of disposing these polymers? 1) Landfill sites 2) Burning 3) Recycling 13 of 17 Problems with recycling? Many types of plastics, hard to identify, need cleaning first - need sorting; time and effort 14 of 17 (Triple paper) What is condensation polymerisation? Reaction of 2 DIFFERENT monomers, with the elimination of water/HCl 15 of 17 (Triple paper) Give an example of a condensation polymer and a use: Nylon - used for making tights 16 of 17 What 2 monomers are in nylon? 1) Diocarboxylic 2) Diamide 17 of 17
Comments
No comments have yet been made