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Chemistry · L5 · Chain Structure → Tg / Crystallinity → Bulk Property

How the packing route (linear vs branched chains) and the flexibility route (bulky side groups vs a flexible backbone) each lead to a distinct crystallinity or Tg outcome, and from there to bulk mechanical behavior.

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Chain structurePacking route orflexibility route?How regular isthe chain packing?High crystallinity XcLow crystallinity XcHow easily doesthe backbone rotate?High TgLow TgStiffer, denser,more opaque, more brittleMore flexible,clearer, lower densityRigid glass persiststo higher temperatureRubbery / softnear room temperatureLinear vs branchedLinear, regularBranched, irregularBackbone flexibilityBulky / rigid side groupsFlexible backbone

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