MSEASUSlides: Polymers Part 1- An Introduction Slide Set
This slide set corresponds to the MaterialsConcepts YouTube video "Polymers Part 1- An Introduction". Here is the link: http://www.youtube.com/watch?v=o3dT1DX3Tsc To study the vocab used in this video, visit this site:
http://quizlet.com/21161469/61-polymers-ia-concepts-terms-flash-cards/ This work was supported by NSF Grants #0836041 and #1226325.
Published on: Mar 4, 2016
Transcripts - MSEASUSlides: Polymers Part 1- An Introduction Slide Set
Chapter 14: Polymer Structures – Polymers I: Concept & Synthesis of Polymers ISSUES TO ADDRESS...• How are polymers synthesized?• How can polymers be categorized?• How do general structural & chemical characteristics of different types of polymer molecules affect mechanical properties?• What are some common polymers & how do they differ? Class 17 – Chapter 14: Polymers I - Structure & Concept - Topic #6.1 1
What is a Polymer? Poly mer Many Units repeat repeat repeat unit unit unitH H H H H H H H H H H H H H H H H HC C C C C C C C C C C C C C C C C CH H H H H H H Cl H Cl H Cl H CH3 H CH3 H CH3Polyethylene (PE) Poly(vinyl chloride) (PVC) Polypropylene (PP) 2
What is the Geometry of a Polymer Chain?C-‐C rota(ons along the chain give the polymer molecule a loosely coiled string-‐like shape
What are Important Polymer Concepts & Terminology?
Polymer MW Effects on Properties – Melting Point MW of Chain = n(DP) * MW Monomer What are the similarities and differences of candles and plastic milk containers? Why does the Tm increase with more C atoms in chain? = n(DP)/2 Candle Container n (DP) 11 10,000 28(11) = 1400 g/mol 28(10000) = 28000 g/mol MW (g/mol) Extended 15 nm 3100 nm Chain Length Tm (degrees C)
Free Radical (Addition) Polymerization – Initiation – Propagation – Termination– Free Radical Initiator Benzoyl Peroxide H H H C O O C 2 C O =2R H H H 6
Thermoplastic Addition Polymers - Vinyls Semicrystalline Semicrystalline Amorphous Amorphous