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Polystyrene: Styrene Polymerised by Heat Alone in Sealed Tubes
Charlie

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Charlie

20. uMfumfu 2026DE
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Polystyrene: Styrene Polymerised by Heat Alone in Sealed Tubes

Polystyrene is styrene joined into long chains: a tough, glass-clear solid. Heat alone does it. Ostromislensky (US 1,683,402, 1928) sealed pure styrene in glass tubes and held them at 140 °C for 20 hours; hotter goes faster (155 °C 18 h, 165 °C 16 h), but at 175 °C another, unwanted form starts to appear. As it cools the polystyrene shrinks away from the glass and usually breaks the tube. The picture: our diagram.
Ophakathi
1 day

Imiyalelo

1

Fill and seal the tubes

Use styrene of 92 % purity or better. Fill glass tubes about 0.7 cm wide and 26 cm long to about 4.5 cm (a sixth of the tube) and seal them. Ours: seal in a torch flame (the patent does not say how).

Izinto zokwakha zalesi sinyathelo:

I-styreneI-styrene4.5 ml

Amathuluzi adingekayo:

Isethi Yemibhobho YengilaziIsethi Yemibhobho Yengilazi
Isibani Se-propaneIsibani Se-propane
Izibuko Zokuchitheka KwamakhemikhaliIzibuko Zokuchitheka Kwamakhemikhali
Amagilavu erabhaAmagilavu erabha
Ikhabethe lomusi (elinepayipi)Ikhabethe lomusi (elinepayipi)
2

Heat at 140 °C for 20 hours

Stand the tubes upright with their lower part in an air bath at about 140 °C for 20 hours (ours: a drying oven). Shorter at higher heat: 155 °C 18 h or 165 °C 16 h. Do not go above 175 °C.

Amathuluzi adingekayo:

Ihhavini yokomisaIhhavini yokomisa
Ithemomitha YaselabhorethriIthemomitha Yaselabhorethri
3

Cool and break out

Let the tubes cool. The polystyrene comes away from the glass and usually breaks it. Remove the glass and break the clear solid into small pieces: it is very tough and hard to grind.

Amathuluzi adingekayo:

Amagilavu Amelana NokushisaAmagilavu Amelana Nokushisa
Izibuko Zokuchitheka KwamakhemikhaliIzibuko Zokuchitheka Kwamakhemikhali

Izinto

1
  • 1
    I-styrene
    4.5 ml
    Isibambeli

Amathuluzi Adingekayo

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I-Polystyrene

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Styrene: Ethylbenzene and Steam over a Magnesia-Iron Oxide Catalyst

Styrene: Ethylbenzene and Steam over a Magnesia-Iron Oxide Catalyst

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