https://padlet.com/begalandreea/e4xdr793uy8u9py3 Сделано с хитринкой en-us 2020-12-11 09:58:16 UTC 2020-12-13 17:52:05 UTC hello@padlet.com begalandreea https://padlet.com/begalandreea/e4xdr793uy8u9py3/wish/1009274430 este un polimer de origine naturala, care se obține din latexul de rășină produs de arborele de cauciuc.]]> 2020-12-11 10:00:17 UTC https://padlet.com/begalandreea/e4xdr793uy8u9py3/wish/1009274430 begalandreea https://padlet.com/begalandreea/e4xdr793uy8u9py3/wish/1009278155 2020-12-11 10:02:57 UTC https://padlet.com/begalandreea/e4xdr793uy8u9py3/wish/1009278155 begalandreea https://padlet.com/begalandreea/e4xdr793uy8u9py3/wish/1009278858 (-C₅H_8-)n]]> 2020-12-11 10:03:29 UTC https://padlet.com/begalandreea/e4xdr793uy8u9py3/wish/1009278858 begalandreea https://padlet.com/begalandreea/e4xdr793uy8u9py3/wish/1009287123 2020-12-11 10:09:29 UTC https://padlet.com/begalandreea/e4xdr793uy8u9py3/wish/1009287123 begalandreea https://padlet.com/begalandreea/e4xdr793uy8u9py3/wish/1009289671 Charles Marie de La Condamine , a descoperit în zona Amazonului  (1744) arborele de cauciuc.
Charles Goodyear(1839) a descoperit întâmplător vulcanizarea cauciucului.
Charles G. William (1860)  separă izoprenul.
Gustave Bouchardat (1879) sintetizează cauciucul artificial din izopren și acid clorhidric.]]> 2020-12-11 10:11:28 UTC https://padlet.com/begalandreea/e4xdr793uy8u9py3/wish/1009289671 begalandreea https://padlet.com/begalandreea/e4xdr793uy8u9py3/wish/1009307686

Cauciucul în stare brută este gălbui, semiopac și elastic.

Ținut la temperatură joasă(0-50 grade C) , el devine opac și neelastic.

Expus mai mult la aer, cauciucul natural devine lipicios și pierde din elasticitate.

Cauciucul natural este insolubil în alcool, acetonă dar se dizolvă bine în benzen și hidrocarburi.

]]> 2020-12-11 10:23:25 UTC https://padlet.com/begalandreea/e4xdr793uy8u9py3/wish/1009307686 begalandreea https://padlet.com/begalandreea/e4xdr793uy8u9py3/wish/1009322735 Vulcanizarea cauciucului constă în încălzirea lui cu sulf (1-5%) la 130-140 grade C.]]> 2020-12-11 10:34:17 UTC https://padlet.com/begalandreea/e4xdr793uy8u9py3/wish/1009322735 begalandreea https://padlet.com/begalandreea/e4xdr793uy8u9py3/wish/1009325716

Nu se înmoaie la cald.

Este mai rezistent.

Este elastic.

]]> 2020-12-11 10:36:36 UTC https://padlet.com/begalandreea/e4xdr793uy8u9py3/wish/1009325716 begalandreea https://padlet.com/begalandreea/e4xdr793uy8u9py3/wish/1009331739

Butadiena

]]> 2020-12-11 10:40:37 UTC https://padlet.com/begalandreea/e4xdr793uy8u9py3/wish/1009331739 begalandreea https://padlet.com/begalandreea/e4xdr793uy8u9py3/wish/1009339693

Izoprenul

]]> 2020-12-11 10:46:08 UTC https://padlet.com/begalandreea/e4xdr793uy8u9py3/wish/1009339693 begalandreea https://padlet.com/begalandreea/e4xdr793uy8u9py3/wish/1009340860

Cloroprenul

]]> 2020-12-11 10:46:59 UTC https://padlet.com/begalandreea/e4xdr793uy8u9py3/wish/1009340860 begalandreea https://padlet.com/begalandreea/e4xdr793uy8u9py3/wish/1009352645 2020-12-11 10:55:08 UTC https://padlet.com/begalandreea/e4xdr793uy8u9py3/wish/1009352645 begalandreea https://padlet.com/begalandreea/e4xdr793uy8u9py3/wish/1009356199

Anvelope pentru automobile.

Echipamente sanitare.

Jucării și diverse obiecte de uz casnic.

Curele și benzi de transmisie.

]]> 2020-12-11 10:57:42 UTC https://padlet.com/begalandreea/e4xdr793uy8u9py3/wish/1009356199 begalandreea https://padlet.com/begalandreea/e4xdr793uy8u9py3/wish/1009362375 2020-12-11 11:02:15 UTC https://padlet.com/begalandreea/e4xdr793uy8u9py3/wish/1009362375 begalandreea https://padlet.com/begalandreea/e4xdr793uy8u9py3/wish/1009364839 2020-12-11 11:04:01 UTC https://padlet.com/begalandreea/e4xdr793uy8u9py3/wish/1009364839 begalandreea https://padlet.com/begalandreea/e4xdr793uy8u9py3/wish/1009369057 2020-12-11 11:07:04 UTC https://padlet.com/begalandreea/e4xdr793uy8u9py3/wish/1009369057 begalandreea https://padlet.com/begalandreea/e4xdr793uy8u9py3/wish/1009371996 2020-12-11 11:09:14 UTC https://padlet.com/begalandreea/e4xdr793uy8u9py3/wish/1009371996