Lecture notes on Structure and Properties of Engineering Polymers
Polymerization Reactions and Techniques Step-growth polymerization or condensation polymerization https://www.slideshare.net/NikolaiPriezjev ...
POLYMERS PPT.pdf
to form a polymer is known as degree of polymerization (DP). DP affect physical properties of polymers. Page 6. CLASSIFICATION. • i)
Polymer Formation in Plasma
Plasma polymers are formed by coupling of free radicals. Not by the free radical chain growth polymerization. What is the mechanism of plasma polymerization
Tutorial on Plasma Polymerization Deposition of Functionalized Films
In myskinTM technology a plasma polymerized coating is applied to a bandage to allow the culture of patient's own cells.
RAFT Fundamentals – A History and Recent Developments
17 thg 7 2016 RAFT Polymerization – Description and History ... Is a Reversible Deactivation Radical Polymerization (RDRP). Disadvantages.
Radical Polymerization Chapter 4
Radical Polymerization. Chapter 4 chain polym'n ~ isolation of polymer (ppt in nonsolvent) ... polymer may not be soluble in monomer ~ ppt polym'n.
Chemical Engineering 160/260 Polymer Science and Engineering
To outline polymerization techniques and describe approaches to reducing viscosity and improving thermal control that involve dispersion of the monomer in
Radical Polymerizations II
Moad and Solomon The Chemistry of Radical Polymerization 2nd edition
3D printing and two photon polymerization: toward the rapid
17 thg 9 2020 Hydrogels and scaffolds. Melissinaki V
Development of Oxidized Sulfur Polymer Films through a
15 thg 1 2014 W
533 Lecture Notes: Introduction To Polymer Chemistry
Polymer:A large molecule (macromolecule) built up by repetitive bonding (covalent) of smaller molecules (monomers) • Generally not a well defined structure or molecular weight • Need to use statistical properties to describe Polymers are formed by linking monomers through chemical reaction — called polymerization
533 Lecture Notes: Introduction To Polymer Chemistry
Polymerization links together many copies of monomers For covalent polymers polymerization involves a transition from weak intermolecular interactions to strong intramolecular bonding Polymerization Linear Homopolymers Monomers Polymer Chemistry Chem 466 Spring 2014 January 14 2014
Chemical Engineering 160/260 Polymer Science and Engineering
polymerization as the most common route to high polymer • To emphasize the importance of stabilization of the charged reactive center on the growing chain • To develop expressions for the average degree of polymerization and molecular weight distribution for anionic polymerization • To introduce the concept of a “living
Chemical Engineering 160/260 Polymer Science and Engineering
Polymerization General Description: onomer InitiatorCarriedout to high conversion Free Usedradicalkineticsapply forethylenestyrene methyl methacrylate Advantages: inimum contaminationof product ulk(Mass)Polymerization Disadvantages: Free acrylonitrileinwater vinylchlorideinbulk radicalkineticsapply Solution Advantages: Solventactsasa Polym
INTRODUCTION TO POLYMERS (RESINS) - West Virginia University
CHAIN (OR ADDITION) POLYMERIZATION Initiators /Catalysts to initiate a free radical chain polymerization: Benzoyl peroxide (BPO) Dicumyl peroxide (DCP) Methyl ethyl ketone peroxide (MEKP) Cumene hydroperoxide (CHP) Upon heating these peroxides dissociate to form two radicals which attack the monomer double bonds and add to them (addition) This
Searches related to polymerization ppt filetype:pdf
polymerization occurs within the monomer droplets high productivity (>40 solid) heat production is under control ? 1 3 4 Emulsion Polymerization ingredients: water monomer initiator and stabilizer size of formed polymer particles approx 0 051?m initiator is solubilized in water phase polymerization occurs mainly within the polymer particles ?
How are polymers formed?
- Polymers are formed by linking monomers through chemical reaction — called polymerization. You don’t end up with a unique molecule. i monomers chain of monomers i A ? — (A-A-A )i/3— Homopolymer:all A identical • The most produced/used polymers are homopolymers of terminal alkenes. • Produced by radical polymerization.
What is polymer chemistry?
- 5.33 Lecture Notes: Introduction To Polymer Chemistry Polymer:A large molecule (macromolecule) built up by repetitive bonding (covalent) of smaller molecules (monomers) • Generally not a well defined structure, or molecular weight. • Need to use statistical properties to describe.
What are the ingredients of emulsion polymerization?
- 1.3.4 Emulsion Polymerization •ingredients: water, monomer, initiator and stabilizer •size of formed polymer particles approx. 0.05?1 ?m •initiator is solubilized in water phase •polymerization occurs mainly within the polymer particles 10
What are the advantages and disadvantages of solution polymerization?
- Solution Polymerization. Advantages: • Solvent acts as a diluent and aids in removal of heat of polymerization. • Solvent reduces viscosity, making processing easier. • Thermal control is easier than in the bulk. Disadvantages: • Chain transfer to solvent occurs, leading to low molecular weights.
Lecture 1:
General Introduction to Polymers
Karen L. Wooley
Departments of Chemistry & Chemical Engineering
Texas A&M University
¾Synthetic vs. retrosynthetic analyses
¾Polymers and polymerizations
¾Covalent vs. supramolecular polymers
¾Controlled properties via controlled macromolecular architectures¾-to-
Sophisticated Plastics
11 Polymer Chemistry, Chem 466, Spring 2014, January 14, 2014
The Uniqueness and Importance of Polymers
2Monomers
Reagents
Polymerizations
Transformations
Functional Polymers of
Controlled Architectures
For development of macroscopic to nanoscopic devicesmotivated by applications but driven by fundamentals:¾ Develop synthetic strategies
¾ Incorporate functions (pollutant clean-up, diagnostics, therapeutics, anti-fouling, etc.) ¾ Conduct rigorous characterization and test performanceMechanical
Function
Barrier
Function
Signaling
Function
www.oled-display.net www.bernos.org www.homepage.mac.com Sophisticated Plastics Polymer Chemistry, Chem 466, Spring 2014, January 14, 2014Synthetic Analysis
of Increasingly Complex Macromolecular Structures 3Synthetic Approach:
¾Develop chemistries to make polymers
¾Characterize their properties (provides important structure-property information)¾Determine practical applications
Functional Polymers of
Controlled Architectures
Initiator
nMonomer
Sequential Controlled Polymerizations
nMonomer
Block Copolymer
Initiator
Chain End Chemical
Transformation
Controlled Polymerization ( and chain end control)Chain-Chain Grafting-Onto
(alternate schemes could be easily designed for grafting-from or grafting-through strategies) nMonomer
Polymer Chemistry, Chem 466, Spring 2014, January 14, 2014Retrosynthetic Analysis
of Increasingly Complex Macromolecular Structures 4Retrosynthetic Approach:
¾Identify desired physical, chemical and mechanical properties ¾Design macromolecules that are expected to possess those properties (knowledge of structure-property relationships is critical) ¾Design retrosynthetic strategies by which to produce those macromoleculesInitiator
Sequential
Controlled
Polymerizations
www.oled-display.netFunctional Polymers of
Controlled Architectures
Initiator and terminator
(provides the and chain ends) nMonomer
nMonomer
Grafting-through Polymerization
nMonomer
Growth of a Diblock Copolymer
from a Graft Block Copolymer Polymer Chemistry, Chem 466, Spring 2014, January 14, 2014 Direct Synthetic vs. Retrosynthetic Approaches to the Preparation of Increasingly Complex Macromolecular Structures 5Direct Synthetic Approach:
¾Develop chemistries to make polymers
¾Characterize their properties (provides important structure-property information)¾Determine practical applications
Retrosynthetic Approach:
¾Identify desired physical, chemical and mechanical properties ¾Design macromolecules that are expected to possess those properties (knowledge of structure-property relationships is critical) ¾Design retro-synthetic strategies by which to produce those macromolecules Both strategies are important to polymer / materials chemistry Polymer Chemistry, Chem 466, Spring 2014, January 14, 2014Polymers and Polymerizations
6¾mers
(many repeat units)¾Monomers are often small
molecules (otherwise macromonomer¾Polymerization links together
many copies of monomers¾For covalent polymers,
polymerization involves a transition from weak intermolecular interactions to strong intramolecular bondingPolymerization
Linear
Homopolymers
Monomers
Polymer Chemistry, Chem 466, Spring 2014, January 14, 2014Polymers and Polymerizations
7¾Growth of polymer chains
results in changes in physical properties¾Demo: Beads in flasks
¾Example: Increasing
oligomeric to polymeric styrene chain lengths (increasing n)Mp = 580 Da = peak molecular weight
DPn ~ 6 = number-average degree of polymerization
(by size exclusion chromatography, e.g.)Viscous oil
Mp = 7000 Da
DPn ~ 70
Glassy material/powder
Mp970 Da
Mp1340 Da
Mp1680 Da
Mp2050 Da
Mp5050 Da
Polymer Chemistry, Chem 466, Spring 2014, January 14, 2014Polymers and Polymerizations
8¾Copolymers can also be
formed¾Statistical (random) copolymers
¾Alternating copolymers
¾Block copolymers
¾Gradient copolymers
¾The properties can be quite
different for each type¾Monomer compositions
¾Intramolecular characteristics
¾Intermolecular interactions
Linear
BlockCopolymer
Linear
Alternating
Copolymer
Polymer Chemistry, Chem 466, Spring 2014, January 14, 2014Covalent vs. SupramolecularStaudinger
9Hermann Staudinger (1881-1965)
1953, Nobel Prize in Chemistry,
confirmation of their existence as covalent chain molecules vs. colloidal systems or aggregates of smaller moleculesH. Ringsdorfquotesdbs_dbs17.pdfusesText_23
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