styrene polymerization

1 Anionic Vinyl Polymerization

2 1 Anionic Vinyl Polymerization Scheme 1 1 Anionic polymerization of styrene using sodium naphthalene as initiator in THF Scheme 1 2 Anionic polymerization of styrene using sec-butyllithium as initiator their reactivity for a sufficient time enabling continued propagation without termination and transfer reactions Szwarc's first report of living anionic polymerization of styrene free from

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STYRENE MONOMER

It has a low vapor pressure and high refractive index It is chemically reactive and undergoes polymerization readily by heat light or peroxide catalysts Polymerization results in volumetric shrinkage (17%) and generation of exothermic heat (17 8 Kcal/mole) Commonly used in the production of styrene homopolymers and copolymers

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The Mechanism of the Self

polymerization Flory proposes that styrene dimerizes to form a singlet 1 4-diradical (M 2 ) 6 A third styrene abstracts a hydrogen atom from the diradical to generate monoradical initiators capable of starting the chain polymerization process Alternatively the diradical itself may be capable of

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STYRENE MONOMER

It has a low vapor pressure and high refractive index It is chemically reactive and undergoes polymerization readily by heat light or peroxide catalysts Polymerization results in volumetric shrinkage (17%) and generation of exothermic heat (17 8 Kcal/mole) Commonly used in the production of styrene homopolymers and copolymers

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Emulsion polymerization of styrene 335 Experimental results With dilatometers of 4 ml capacity the contraction for 100 0 conversion was about 1 cm for a stem of bore 3 mm Since the cathetometer could be read accurately to + 002 mm a conversion of the order of 020% could be easily estimated

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Polymers

In the anionic polymerization of styrene described above a reactive site remains at the end of the chain until it is quenched The unquenched polymer has been termed a living polymer and if additional styrene or a different suitable monomer is added a block polymer will form

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Suspension Polymerization of Styrene

OBJECTIVE The objective of this lab is to demonstrate the polymerization of styrene in order to establish a better understanding of the behavior of styrene molecules and the properties of linear and cross-linked organic structures PROCEDURE The experiment was performed accordingly to the guidelines and directions provided in the lab hand-out However because no precipitant was formed

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Styrene emulsion polymerization process

This invention relates to polystyrene More particularly the invention relates to a process for the emulsion polymerization of monomeric styrene The polymerization of styrene in aqueous emulsion though long known has been beset with many difficulties Long washing procedures have been necessary to produce a clear homogeneous polymer

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Development of Continuous Anionic Styrene

Anionic polymerization is not used commercially to manufacture polystyrene due to technical problems (e g feed purification) associated with anionic chemistry Since anionic polymerization offers several potential product (e g no residual styrene monomer) and process advantages (e g fast polymerization rate) over free radical polymerization solutions to these technical problems were

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Living Polymerization

So butadiene can initiate styrene 1 Difunctional initiator: ex: Na naphthalene + butadiene PB Consume B completely and then add styrene (S) Symmetric triblock b/c same prop rate and time 2 Add S+B+S in sequence (w/monomer fully consumed by each step) 3 First initiate PS a) PS b) add butadiene + styrene together in big aliquot

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VACUUM DISTILLATION POLYMERIZATION OF STYRENE

Dry the styrene over calcium chloride for several minutes Polymerization of styrene To six 13 x 75 mm test tubes add about 1 mL styrene samples a couple of boiling chips and additive as directed below # Tube 1 1 commercial styrene directly from commercial bottle 2 commercial styrene directly from commercial bottle + 1 drop of t-butyl

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Styrene polymerization with half

Syndiospecific polymerization of styrene proceeded under limited polymerization conditions The maximum productivity of syndiotactic polystyrene was attained under the following conditions: Al/Ti molar ratio = 20 (mol/mol) polymerization temperature = 40-50 C

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Styrene polymerization by nickel and titanium catalysts

In this paper we report the studies related to the use of 1-4 pre-catalysts in styrene polymerization Studies related to the effect of some polymerization parameter (solvent polymerization temperature styrene concentration time of polymerization and aluminum concentration) on the activity and polystyrene properties will be presented

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Polymer Chemistry

Chain-Reaction Polymerization Chain-reaction polymerization sometimes called addition polymerization requires an initiator to start the growth of the reaction The largest family of polymers 3 vinyl polymers are produced by chain polymerization reactions A good example is the free-radical polymerization of styrene which is initiated by a free radical (R) that reacts with styrene

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Design and analysis of a photoreactor for styrene

The photopolymerization of styrene was studied in a well-mixed annular photoreactor Experimental rates of polymerization measured at low conversions compared quite favorably with predicted rates based on a computer model of the photoreactor

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Solution styrene polymerization in a millireactor

Solution styrene polymerization in a millireactor / L Fullin -- verso corr -- So Paulo 2014 108 p Dissertao (Mestrado) - Escola Politcnica da Universidade de So Paulo Departamento de Engenharia Qumica 1 Polimerizao I Universidade de So Paulo Escola Poli- tcnica Departamento de Engenharia Qumica II t

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Emulsion polymerization of styrene 335 Experimental results With dilatometers of 4 ml capacity the contraction for 100 0 conversion was about 1 cm for a stem of bore 3 mm Since the cathetometer could be read accurately to + 002 mm a conversion of the order of 020% could be easily estimated Figure 2 shows that the rate of conversion of monomer is steady up to about 50 % conversion for

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Polymerization Ppt

Bulk polymerization Mass or block polymerization: Polymerization of the undiluted monomer carried out by adding a soluble initiator to pure monomer into liquid state Viscosity increases dramatically during conversion 2 types Quiescent bulk polymerization Eg : phenol- formaldehyde condensation Stirred bulk polymerization Eg : nylon 66

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Trinseo PC/ABS – an ideal mix of excellent properties

Trinseo's product families PULSE™ PC/ABS Resins and EMERGE™ Advanced Resins provide an industry-leading balance of attributes such as toughness (also at low temperatures) heat ignition and impact resistance that enable applications requiring enhanced physical

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Styrene

Polymerization of Styrene Polystyrene (PS) is one of the largest volume vinyl polymers used in countless products from food-packing and plastic cutlery to house insulation The primary reasons for its great popularity are its low cost high transparency good mechanical properties and ease of coloring foaming and processing

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Styrene Formula

Physical properties: Styrene is a colorless oily liquid with a sweet smell The insoluble in water but it is highly soluble in DMSO and organic solvents as ethyl acetate ethanol methanol benzene and acetone Chemical properties: Styrene is highly used in polymerization as a precursor of many reaction due to the presence of one vinyl group

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