Polymers RET LESSON MR. Groff Marlington High School.

Slides:

Advertisements

Similar presentations

Materials AQA Physics A.

Advertisements

Noadswood Science, 2012 Hooke's Law. Hooke’s Law To know Hooke’s law Wednesday, April 22, 2015.

Chapter 13 - Elasticity A PowerPoint Presentation by

Springs and Elasticity ClassAct SRS enabled. In this presentation you will: Explore the concept of elasticity as exhibited by springs.

Edexcel AS Physics Unit 1 : Chapter 7: Solid Materials

Elasticity by Ibrhim AlMohimeed

Solid Materials.

Normal Strain and Stress

Chapter 3 Mechanical Properties of Materials

Polymer network consists of long polymer chains which are crosslinked with each other and form a continuous molecular framework. All polymer networks (which.

Elasticity of Elastomers  Materials which undergo recoverable deformation of a few 100 % are called elastomers and exhibit rubber like elasticity  Elastomers.

Cross-linked Polymers and Rubber Elasticity

Copyright © 2009 Pearson Education, Inc. Lecture 8a – States of Matter Solids.

Copyright © 2009 Pearson Education, Inc. Chapter 12 Elasticity.

Elastic potential energy

Deforming Solids.

MECHANICAL PROPERTIES OF SOLIDS

Objectives  Understand how elasticity is related to Hooke’s Law for springs.  Know that the change in length of an object is proportional to the force.

Elasticity and Fluid Physics Karl Andre O. Ortiz.

1.3.4 Behaviour of Springs and Materials

Elastic Stress-Strain Relationships

Elasticity and Strength of Materials

Engineering Practicum Baltimore Polytechnic Institute M. Scott (Pass in Remote Measurement Lab Report) 1.What is the relationship between a)Tensile Strength.

Chapter 9 Static Equilibrium; Elasticity and Fracture

Current Electricity and Elastic Properties. Contents Current Electricity Current Electricity –Ohm’s Law, Resistance and Resistivity –Energy Transfer in.

Strong forces are needed to stretch a solid object. The force needed depends on several factors.

2.2 Materials Materials Breithaupt pages 162 to 171.

2.2 Materials Materials Breithaupt pages 162 to 171.

FYI: All three types of stress are measured in newtons / meter2 but all have different effects on solids. Materials Solids are often placed under stress.

Stress and Strain Unit 8, Presentation 1. States of Matter  Solid  Liquid  Gas  Plasma.

Physics Notes Ch 9 Statics Statics – The study of forces in equilibrium. The net force and the net torque on an object (or on a system) are zero. The.

STRENGTH OF MATERIALS John Parkinson ©.

Stress and Strain  Tensile Stress- the ratio of the magnitude of the applied force F to the cross-sectional area A: Mathematically, Stress= Force/Area=F/A.

– SOLID MECHANICS S.ARAVINDAN Lecturer Department of Aeronautical Engineering Rajalakshmi Engineering College 1.

Materials PHYA2. MATERIALS DENSITY, SPRINGS, STRESS AND STRAIN Topics 11, pp.162–173.

Chapter 12 Static Equilibrium and Elasticity. Static Equilibrium Equilibrium implies that the object moves with both constant velocity and constant angular.

Goal: to understand waves Objectives: 1)To learn about Oscillations and vibrations 2)To understand the properties of Waves 3)To learn about Transverse.

PVC PE PS Classification of polymers according to their thermal behaviours: 1) THERMOPLASTICS Thermoplastic polymers can be softened when heated and hardened.

4 Mechanical Properties of Biomaterials CHAPTER 4.1 Introduction

STRESS-STRAIN RELATIONSHIP

1.To understand the keywords associated with the deformation of different types of solids 2.To be able to calculate stress, strain and hence Young’s modulus.

Describe each section of the graph below.. Spring follows Hooke’s law; it has elastic behaviour. Elastic limit is reached, it is permanently deformed.

1.To understand the keywords associated with the deformation of different types of solids 2.To be able to calculate stress, strain and hence Young’s modulus.

Unit 1 Key Facts- Materials Hooke’s Law Force extension graph Elastic energy Young’s Modulus Properties of materials.

UNIVERSITY OF GUYANA FACULTY OF NATURAL SCIENCES DEPART. OF MATH, PHYS & STATS PHY 110 – PHYSICS FOR ENGINEERS LECTURE 12 (THURSDAY, NOVEMBER 17, 2011)

-Elastic Properties of Solids AP Physics C Mrs. Coyle.

Lecture 12. Mechanical Properties. Engineering Stress < True Stress True StressTrue Strain.

Polymer Structures and Properties

© Pearson Education Ltd 2008 This document may have been altered from the original Week 13 Objectives Define and use the terms stress, strain and Young.

Elasticity Yashwantarao Chavan Institute of Science Satara Physics

Members ;  Siti Sarah Bt Azhar ( )  Nur Marjan Bt Suhaimi ( )  Nurul Afifah Bt Fauzi ( )  Amiera Firzana Bt Mohammad ( ) 

1© Manhattan Press (H.K.) Ltd Energy stored in stretched wire Elastic potential energy Elastic potential energy per unit volume.

2.2 Materials Materials Breithaupt pages 162 to 171.

3.4.2 mechanical properties of matter

Lec 10: Solids Molecules and Molecular Bonds Solids: Density

Types of Solids There are three main types of solid:

Bulk properties of solids

Elasticity Yasser Assran 27/10/2015.

Chapter 7 Deforming Solids.

Polymer chain and rubber elasticity

Fundamentals for the Up-and-Coming Bridge Engineer

Classification of polymers according to their thermal behaviours:

Bell Ringer: What is a force? What is Newton’s 2nd Law? What is work?

Springs / Hooke's law /Energy

A spring is an example of an elastic object - when stretched; it exerts a restoring force which tends to bring it back to its original length or equilibrium.

Elastic Deformation: Stress, Strain and Hook’s Law

Describing deformation

A spring is an example of an elastic object - when stretched; it exerts a restoring force which tends to bring it back to its original length or equilibrium.

Hooke’s law Hooke’s law states that the extension of a spring force is proportional to the force used to stretch the spring. F ∝ x ‘Proportional’

Presentation transcript:

Polymers RET LESSON MR. Groff Marlington High School

What is a polymer? Lets see if you know! What is a polymer? Do you use any in every day life? What are they made of?

LARGE MOLECULES POLYMER: A Large Molecule made up of many repeating subunits!!! What are the repeating subunits called? What every day item can we compare these large molecules to?

Common Polymer Types Plastics!Rubber! Glass ! er/File:Plastic_bottle.jpg

PDMS ---polymer “Polydimethylsiloxane” Picture from ref. 2.

How we will make it Silicone Base + Curing Agent (cross linker)+ Heating (crosslinking catalyst) Then we have cross-linked material! Now, if we want a certain thickness, and we are going to make it in glass petri dishes…how will we know how much to use……???

DENSITY=Mass/Volume D PDMS= kg/m³ What variables from the Density Formula do we need…? Lets break them down 1. Volume First---Thickness 2. Mass 2 nd for CRL Ratio

Entropy and Potential Energy. What causes certain materials to return after being stretched? Why do rubber bands “go back”? These questions can be answered through a simple understanding of ENTROPY. ENTROPY: a measure of molecular disorder. Through altering a material, by cross-linking it for example, one can give order to the disorder. This can cause properties such as elasticity. By stretching an elastic polymer you can cause the entropic spring result and amounts to saying: upon stretching a polymer chain you are doing work on the system, thereby increasing its potential energy due to dragging it away from its (preferred) equilibrium state. An example of this is a common elastic band, composed of long chain (rubber) polymers

Visual-crosslinking (A) is an unstressed polymer; (B) is the same polymer under stress. When the stress is removed, it will return to the A configuration. (The dots represent cross- links) Force Applied Entropic Spring Result (restoring force) Picture from ref. 3

Young’s Modulus STRESS vs. STRAIN Stress—The Internal Force per unit area associated with a strain. Strain–- The Relative change in shape or size of an object due to externally applied forces. Stress/Strain=Young’s Modulus.

Visual Area= (x)(z) x zL L ΔL Force Applied Entropic Spring Result (restoring force)

Young’s Cont. Stress = (Force/Cross sectional area) Strain= (Change in Length/ Initial Length) E= Young’s Modulus Equation from ref. 4.

Stress Strain and Hooke’s Law Picture from ref 6. Picture from ref 5.

CHOOSE!!!! Young’s Modulus due to CRL Ratio 20:1 or 10:1 or 8:1 Young’s Modulus due to Thickness of Sample 1mm2mm4mm

Bibliography 1. Polymer physics. (2014, July 7). In Wikipedia, The Free Encyclopedia. Retrieved 14:21, July 14, 2014, from Polydimethylsiloxane. (2014, June 27). In Wikipedia, The Free Encyclopedia. Retrieved 14:22, July 14, 2014, from Elastomer. (2014, May 13). In Wikipedia, The Free Encyclopedia. Retrieved 14:30, July 14, 2014, from Young's modulus. (2014, June 26). In Wikipedia, The Free Encyclopedia. Retrieved 14:46, July 14, 2014, from Stress–strain curve. (2014, July 5). In Wikipedia, The Free Encyclopedia. Retrieved 14:49, July 14, 2014, from Hooke's law. (2014, July 9). In Wikipedia, The Free Encyclopedia. Retrieved 15:00, July 14, 2014, from