Makro at Albert-Ludwigs-Universität Freiburg

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Exemplary flashcards for Makro at the Albert-Ludwigs-Universität Freiburg on StudySmarter:

What are the different types of radical iniators?

Exemplary flashcards for Makro at the Albert-Ludwigs-Universität Freiburg on StudySmarter:

What are the characteristics of a free radical polymerization?

Exemplary flashcards for Makro at the Albert-Ludwigs-Universität Freiburg on StudySmarter:

Definition of chain growth polymerization.

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Exemplary flashcards for Makro at the Albert-Ludwigs-Universität Freiburg on StudySmarter:

Definition of step growth polymerization.

Exemplary flashcards for Makro at the Albert-Ludwigs-Universität Freiburg on StudySmarter:

What is the Trommsdorff effect?

Exemplary flashcards for Makro at the Albert-Ludwigs-Universität Freiburg on StudySmarter:

With what can you control MW in a free radical polymerization?

Exemplary flashcards for Makro at the Albert-Ludwigs-Universität Freiburg on StudySmarter:

What kind of constitutional isomers do you know?

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Exemplary flashcards for Makro at the Albert-Ludwigs-Universität Freiburg on StudySmarter:

What are the different types of tacticity in polymers?

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What are the different types of radical polymerization?

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Describe suspension polymerization.

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What are the different types o polyethylene?

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Exemplary flashcards for Makro at the Albert-Ludwigs-Universität Freiburg on StudySmarter:

Types of measurement of viscosity.

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Exemplary flashcards for Makro at the Albert-Ludwigs-Universität Freiburg on StudySmarter:

Makro

What are the different types of radical iniators?

  • light activated initiators
  • ionizing radiation
  • redox initiators
  • electrochemical

Makro

What are the characteristics of a free radical polymerization?

  • high MW species earlier in the polymerization results (rapid increase of viscosity)
  • rapid consumption of vinyl monomers = exotherm
  • radical quenching leads to uncontrolled branching in polymer chains

Makro

Definition of chain growth polymerization.

...via addition of a monomer to agrowing polymer.

Makro

Definition of step growth polymerization.

... via coupling of few strings of monomer units 

--> lead to larger polymer chains

Makro

What is the Trommsdorff effect?

  • rapid increase in molecular weight
  • dramatic increase in viscosity
  • gelation of polymer melt
  • highly exothermic

Makro

With what can you control MW in a free radical polymerization?

Chain transfer agent (CTA)

-->need of a weak bond

-->by quenching the active side is tranferred and so it can initiate a new polymer chain growing

Makro

What kind of constitutional isomers do you know?

  • positional
    • head-head, head-tail, tail-head
    • position of side groups
  • geometric
    • cis vs. trans
  • branding
    • multi arms star polymer
  • conformational

Makro

What are the different types of tacticity in polymers?

isotactic: groups are arranged on the same side


syndiotactic: groups alternate


atactic: groups are arranged randomly

Makro

What are the different types of radical polymerization?

  • bulk polymerization
  • solution polymerization
  • suspension polymerization
  • emulsion polymerization

Makro

Describe suspension polymerization.

  • monomer and initiator in aqueous phase
  • heat is dissipated by the water phase

Makro

What are the different types o polyethylene?

Low density PE (LDPE):

  • branched


High density PE (HDPE):

  • linear
  • huge MW
  • ultra high MW PE (UHMWPE)


Linear low density polyethylene (LLPE):

  • branching is controlled

Makro

Types of measurement of viscosity.

  • Capillary viscometer
  • Coaxial Cylindrical couette viscometer

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Einführung in die Bildungswissenschaften

Makro 2 at

Hochschule Reutlingen

MAKRO at

Hochschule für angewandte Wissenschaften Würzburg-Schweinfurt

makro at

Hochschule für angewandte Wissenschaften Würzburg-Schweinfurt

makro at

Hochschule für Wirtschaft und Umwelt Nürtingen-Geislingen

Makro 2 at

Universität Bayreuth

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