Polymer Science: Terms and Concepts, Quizzes of Civil Engineering

Download Polymer Science: Terms and Concepts and more Quizzes Civil Engineering in PDF only on Docsity! TERM 1 Monomer DEFINITION 1 Single Unit - may bind chemically with other monomers to form a polymer TERM 2 Oligomer DEFINITION 2 a few unitsconsists of about 2-10 monomers reacting with each other TERM 3 Polymer DEFINITION 3 a large molecule made up of many monomers TERM 4 Bond Energy (Primary Bonds) DEFINITION 4 Within chains and crosslinks TERM 5 Bond Energy (Secondary) DEFINITION 5 Between chains and between the polymers and other bonding materials such as steel and concrete TERM 6 Bond Energy (Single) DEFINITION 6 1.54 x 10^-10 m349 kj/moleRotation TERM 7 Bond Energy (Double) DEFINITION 7 1.32 x 10^-10m607 kj/moleno rotation TERM 8 Lack of Rotation DEFINITION 8 reduces flexibilityreduces thermal propertiesincreases mechanical properties TERM 9 Primary Bonds DEFINITION 9 Covalent (sharing)binds together the atoms within the polymer chain TERM 10 Amorphous DEFINITION 10 non ordered structure caused byt he effects of thermal energy TERM 21 What do composite material systems consist of DEFINITION 21 High Strengthhigh resistance to corrosion and chemicalshigh resistance to high temperatureshigh resistance to abraionstoughnessfatiguelight weight TERM 22 Advantages of Composite Material Systems DEFINITION 22 Year round constructionshort construction timehigh performanceexcellent strength to weight ratio TERM 23 Disadvantages to composite material system DEFINITION 23 high first costcreep and shrinkagepotential for environmental degrdation (alkali, UV, moisture)Consistency of material TERM 24 Components of composite DEFINITION 24 Fiber reinforcementresinfillersadditives TERM 25 Fibers DEFINITION 25 primary function is to carry loads along the length of the fiber, provides strength or stiffness in one direction TERM 26 Resins DEFINITION 26 Transfer stress between reinforcing fibers and to protect them from mechanical and environmental damage TERM 27 Fillers DEFINITION 27 Control composites costimproved mechanical propertiesimproved chemicalreduced creep and shrinkagelow tensile strengthfire retardant TERM 28 Additives DEFINITION 28 Improved material propertiesaestheticsenhanced workabilityimproved peformance TERM 29 Types of Defects DEFINITION 29 KnotsWanesShakeSplitSloping GrainCoss grain Crack TERM 30 Knots DEFINITION 30 Weaken timber if loadedperpendicularlylower structural value TERM 31 Wane DEFINITION 31 Presence of bark in the wood or lack of wood on an edge/corner TERM 32 Shake DEFINITION 32 Separationin wood parallel to rings, bacterialhigh moisture and lower strength TERM 33 Tensile Strength DEFINITION 33 Parallel: 10,000-22,000 PSIPerpendicular: 300-1300 PSI TERM 34 Compressive Strength DEFINITION 34 Parallel: 3500 to 9000 PSI (small kinks will lead to buckling)Perpendicular: 400-1500 PSI (hollow wood cells collapse) TERM 35 Flexural Strength DEFINITION 35 6,000 to 14,500 PSI