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File:23. Вештачки снег.ogv

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Description
Македонски: Мало количество натриум полиакрилат се става во лабораториска чаша (околу 5 g во чаша од 100 mL). Кон полимерот наеднаш се додаваат 100 mL вода. Водата моментно се апсорбира и содржината од чашата почнува да се „прелева“. Добиениот материјал прилега на снег.

Полимерот има способност да апсорбира вода 200 до 300 пати од својата маса. Тој е еден од групата на суперапсорбирачки полимерни гелови чиja полимерна низа може да се зголеми до 40 пати во однос на почетниот волумен. Апсорпциониот капацитет на полимерот се должи на способноста да ги „зароби“ молекулите вода во празнините преку јонски интеракции и на таков начин се овозможува „растегнување“ на полимерната низа.

[−CH2CH(COONa)−]n + nH2O = [−CH2CH(COONa)−]n· nH2O

Осмислено и изведено од Марина Стојановска, Миха Буклески и Владимир Петрушевски, Институт за хемија, ПМФ, УКИМ, Скопје.
English: Small amount of sodium polyacrylate is added to a glass beaker (approximately 5 g for a 100 mL beaker). 100 mL of water is added to the polymer at once. The water is being absorbed instantly and the content starts to overflow. The material resembles snow.

This polymer can absorb water some 200 to 300 times its own mass. It is one of the superabsorbent polymer gels, whose long-chain polymer can expand to 40 times its initial volume. The absorption capacity is due to its capability to “capture” water molecules in its cavities via ionic interactions that enables the stretching of the polymeric chain.

[−CH2CH(COONa)−]n + nH2O = [−CH2CH(COONa)−]n· nH2O

Planned and performed by Marina Stojanovska, Miha Bukleski and Vladimir Petruševski, Department of Chemistry, FNSM, Ss. Cyril and Methodius University, Skopje, Macedonia.
Date
Source Own work
Author Карас Студио

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22 January 2020

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application/ogg

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9f2a5fdc0f09912abb73bab0c8910558cb778163

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18,970,984 byte

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25.1306666666667 second

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1,920 pixel

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current12:28, 22 February 202025 s, 1,920 × 1,080 (18.09 MB)ИнокентијUser created page with UploadWizard

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