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10 Cards in this Set
- Front
- Back
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E = trans |
Z = cis |
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You can make nylon from |
Amides, it is a polyamide made from condensation polymerisation . |
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Hydrolysis of amides |
MODERATELY CONCENTRATED acid or alkali . |
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T g |
The temperature below which the polymer is glassy and brittle. |
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To lower T g |
Co polymerise with small amounts of a monomer that adds side chains Add plasticiser, a non-volatile liquid whose molecules fit between the polymer chains. Cold draw to increase T g / crystalinity . |
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T trans |
temperature below which Switching segments in the polymer become inflexible. |
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T m |
Above which a polymer softens |
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Green chemistry |
Recycling (Labour intensive) Chemical recycling Cracking Burning Or make plastics which can decompose naturally : Biopolymers - structures that bacteria can break down Add starch grains to synthetic polymers Photodegradable plastics . |
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Electronegativity |
is a measure of the tendency of an atom to attract a bonding pair of electrons |
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The solvent used in recystalisation must |
Must be one in which the substance is very soluble at higher temperatures and insoluble , or nearly so, at lower temperatures. Is saturated by the substance then crystalises out to leave the impurities in solution . |
