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  • Laboratorijas darbu paraugi. Polipienskābes jeb poli (2-hidroksipropābskābes) sintēze

     

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ID number:215214
Author:
Evaluation:
Published: 21.01.2011.
Language: Latvian
Level: Secondary school
Literature: n/a
References: Not used
Extract

1.variants
Reaģenti un materiāli : 90% vai 40% pienskābes šķīdums; 50ml vārglāze, žāvējamais skapis.
Darba gaita
Vārglāzē ielej 10g pienskābes šķidruma un 24 stundas karsē žāvējamā skapī 200°C temperatūrā . Atdzesē līdz istabas temperatūrai. Iegūst brūnganu polipienskābju masu, kas karstumā ir viskoza, bet atdziestot kļūst trausla. Uzkarsējot līdz 150°C temperatūrai, to var atkal sašķīdināt un karstu apstrādāt tālāk, piemēram, liekot noteiktas formas veidnēs. …

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