| ADJ | syndiotactic | more syndiotactic | most syndiotactic |
ADJ positive | comparative | superlative
1 Übersetzung
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Anwendungsbeispiele Englisch
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- Commercial synthesis of syndiotactic polypropylene is carried out with the use of a special class of metallocene catalysts.
- In the presence of catalysts lactide polymerize to either atactic or syndiotactic polylactide (PLA), which are biodegradable polyesters.
- When these associations are stacks of alternating ("R") and ("S") molecules (as in syndiotactic polymers) this can be accomplished very efficiently.
- Coordination type polymers are also stereoregular and can be isotactic or syndiotactic instead of just atactic.
- Depending on the catalyst, syndiotactic or a heterotactic polymers can result.
- With yttrium-based catalysts racemic β-butyrolactone can be converted into (mainly) syndiotactic PHB with narrow molecular weight distribution.
- In syndiotactic or syntactic macromolecules the substituents have alternate positions along the chain.
- There are three types of tacticity: isotactic (all substituents on the same side), atactic (random placement of substituents), and syndiotactic (alternating placement of substituents).
- For example, three distinct "ansa"-zirconocene dichloride catalysts used in the synthesis of polypropylene in the presence of methylaluminoxane (MAO) can be used to direct whether the product is syndiotactic, isotactic, or atactic.
- For example, atactic polypropylene is usually amorphous and transparent while syndiotactic polypropylene, which has crystallinity ~50%, is opaque.
- A variety of catalysts can polymerise lactide to either heterotactic or syndiotactic polylactide, which as biodegradable polyesters with valuable (inter alia) medical properties are currently attracting much attention.
- In 1935 Natta married Rosita Beati; a graduate in literature, she coined the terms "isotactic", "atactic" and "syndiotactic" for polymers discovered by her husband.
© dict.cc English-German dictionary 2024
Enthält Übersetzungen von der TU Chemnitz sowie aus Mr Honey's Business Dictionary (nur Englisch/Deutsch).
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