Falcelinta Polymerization
Pendahuluan
Polymers-ku waa iskudhisyo kiimiko ah oo ka kooban molecules silsilad dheer oo waaweyn oo ka samaysan unugyo soo noqnoqda oo loo yaqaan monomers. Polymerization waa habka kiimikada ee monomers-kani ay isku daraan si ay u sameeyaan polymers. Habkani waa mid muhiim u ah warshadaha kiimikada wuxuuna gacan ka geystaa sameynta agabyo kala duwan oo qiimo leh, oo ay ku jiraan balaastikada, caagga, iyo fiilooyinka synthetic-ga.
Maqaalkani wuxuu higsanayaa inuu sharaxo hababka, noocyada, iyo codsiyada falcelinta polymerization. Hawsha polymerization waxay ku dhici kartaa habab kala duwan, oo leh laba qaybood oo waaweyn: polymerization ku darista iyo polymerization condensation.
Noocyada Polymerization-ka
Isku-darka Polymerization
Polymerization-ka ku darista waa hab ay monomers-ka leh bonds labanlaab ah ama saddex-geesood ah ay uga falceliyaan sameynta polymer iyagoon soo saarin wax soo saar ka soo horjeeda. Polymers-ka ay soo saarto noocan polymerization-ka waxaa loo yaqaan polymers-ka ku darista.
Talaabooyinka:
1. Bilaabidda: Falcelintu waxay bilaabataa marka bilaabaha uu soo saaro xagjirro xor ah, ion, ama kataliyayaal kuwaas oo jebin kara isku xidhka labanlaab ee monomers-ka.
2. Faafinta: Xagjirnimada xorta ah ama ayoonnada la sameeyay waxay la falgalaan monomers-ka, iyagoo abuuraya darafyo cusub oo firfircoon oo la falgeli kara monomers kale.
3. Joojinta: Falcelintu waxay joogsataa marka laba xagjir oo xor ah ay kulmaan oo ay sameeyaan xiriir isku xiran, ama marka farsamo kale ay joojiso faafinta.
Tusaale:
– Poly(ethylene): Ethylene monomer (C2H4) wuxuu falceliyaa iyada oo loo marayo silsilad xagjirro xor ah si uu u sameeyo poly(ethylene).
– Poly(vinyl chloride) (PVC): Monomers-ka vinyl chloride (C2H3Cl) waxaa lagu biiriyaa bilowga, faafinta, iyo joojinta.
Polymerization-ka uumiga
Polymerization-ka uumiga wuxuu ku lug leeyahay monomers-ka leh ugu yaraan laba kooxood oo shaqeynaya oo falgal ah waxayna sameeyaan polymer-ka oo leh wax soo saarka ka soo baxa, sida biyaha ama methanol.
Talaabooyinka:
1. Bilow: Monomers-ka leh kooxo shaqeynaya oo falgal ah ayaa is falgala.
2. Samaynta: Samaynta isku xidhka u dhexeeya monomers-ka, oo ay weheliso sii deynta molecules-ka iftiinka, sida H2O ama HCl.
3. Kobaca Silsiladda: Habkani wuxuu socdaa ilaa monomers-ku dhammaadaan ama xaaladaha falcelinta aysan mar dambe wanaagsanayn.
Tusaale:
– Nylon-6,6: Waxaa laga sameeyay falgalka u dhexeeya hexamethylenediamine iyo adipic acid, kaas oo soo saara biyo ahaan wax soo saar ahaan.
– Polyester: Waxaa laga sameeyay falgalka u dhexeeya terephthalic acid iyo ethylene glycol, iyadoo biyo loo adeegsanayo wax soo saar.
Habka Polymerization
Polymerization-ka Xagjirnimada Bilaashka ah
Polymerization-ka xagjirka ah ee xorta ah waa mid ka mid ah farsamooyinka polymerization-ka ee ugu badan ee lagu daro. Hawshani waxay ka bilaabataa sameynta xagjirrada xorta ah ee aadka u falcelsan, badanaa iyada oo loo marayo kuleylka ama sawir-qaadista.
1. Bilaabidda: Molekulada bilaaba sida benzoyl peroxide ama azobisisobutyronitrile (AIBN) ayaa la kala jabiyaa si ay u soo saaraan xagjirro xor ah.
\[ \text{(Fiiro gaar ah, AIBN) → 2 \cdot (Xag-jir, )} \]
2. Faafinta: Xagjiriinta xorta ah waxay la falgalaan monomers si ay u sameeyaan xagjiryada monomer-ka ee fidsan:
\[ \text{(Radical + Monomer) → (R-Polymer)} \]
3. Joojinta: Laba xagjir oo xor ah ayaa isku dara si ay u sameeyaan molecule aan xagjir ahayn oo ay u joojiyaan falcelinta silsiladda:
\[ \text{(R + R) → Wax soo saar aan xagjir ahayn} \]
Polymerization-ka Ion
Polymerization-kani wuxuu ku lug leeyahay sameynta ayoonada (kations ama anions) sida noocyada falgalka ah. Polymerization-ka Ionic waxaa sidoo kale loo qaybin karaa laba nooc oo waaweyn, kuwaas oo kala ah:
– Isku-dubaridka Cationic: Waxay ku lug leedahay nooc ka mid ah cationic oo ah bilowe. Caadi ahaan waxaa loo isticmaalaa monomers-ka leh kooxo ku deeqa elektarooniga sida isobutylene.
– Polymerization-ka Anionic: Waxay ku lug leedahay ion-yada (anions) ee si taban loo dallacay sida kuwa bilaabaya. Waxaa loo isticmaalaa monomers-ka leh kooxaha aqbala elektarooniga sida styrene.
Isuduwidda Polymerization
Noocan ah polymerization waxaa dhexdhexaadiya kataliyayaal isku dhafan oo bir ah, tusaale ahaan waa polymerization-ka Ziegler-Natta ee loo isticmaalo in lagu sameeyo polyethylene-ka caadiga ah ee stereo-regular iyo polypropylene.
1. Katalystayaasha: Biraha kala-guurka sida titanium chloride waxaa loo isticmaalaa iyadoo lala kaashanayo isku-dhafka organometallic sida aluminium triethyl (AlEt3).
2. Falcelinta: Monomers-ku waxay isku daraan booska firfircoon ee isku-dhafka birta.
Codsiyada Polymerization
Warshadaha Balaastikada
Balaastiggu waa badeecadaha ugu caansan uguna isticmaalka badan polymer-ka. Waxaa lagu sameeyaa hababka polymerization-ka ee ku darista iyo isku-darka. Tusaalooyinka alaabada polymerization-ka ee caadiga ah waxaa ka mid ah polyethylene, polypropylene, PVC, iyo PET (polyethylene terephthalate). Balaastikada waxaa loo isticmaalaa soo saarista baakadaha, alaabta carruurtu ku ciyaarto, tuubooyinka, iyo noocyo kala duwan oo alaab macaamiil ah.
Qalabka Faybarka
Faybarro macmal ah sida nayloon iyo polyester ayaa ka dhasha isku-darka biyaha. Waxaa loo isticmaalaa soo saarista dharka, dharka, iyo alaabta guriga sida roogagga iyo xarigga. Faybarrada waxaa badanaa loo doortaa xooggooda, iska caabbinta xoqidda, iyo dabacsanaantooda.
Cinjir Macmal ah
Cinjirro macmal ah, sida polybutadiene iyo styrene-butadiene (SBR), waa wax soo saar ka dhashay polymerization-ka lagu daray monomers-ka ku jira diene. Cinjirradan waxaa loo isticmaalaa soo saarista taayirada baabuurta, shaabadaha, iyo codsiyada warshadaha ee kala duwan sababtoo ah iska caabbinta xoqidda iyo isbeddelka.
Resins-ka Epoxy iyo Polymers-ka Heerkulka dejinaya
Resins-ka Epoxy waa natiijada polymerization-ka uumiga ee ka dhaca heerkulka qolka ama kuleylinta. Waxaa loo isticmaalaa dhejisyada, rinjiyada, iyo walxaha isku dhafan ee u baahan iska caabbinta kulaylka iyo kiimikooyinka. Polymers-kan thermosetting-ka ah lama dhalaalin karo ka dib marka la bogsado, si ka duwan polymers-ka thermoplastic-ka ah.
Biyomedis
Polymers-ka loo isticmaalo codsiyada biomedical-ka waxaa ka mid ah polylactide (PLA) iyo poly(tetrahydrofurane) (PTHF), kuwaas oo loo isticmaalo in lagu abuuro agab lagu tallaalo bioresorbable. Polymers-kan waxaa loogu talagalay inay jirka ku burburaan, taasoo yaraynaysa baahida loo qabo in qalliin labaad laga saaro.
Maaddooyinka Korontada ku shaqeeya
Polymers-ka elektaroonigga ah waa polymers-ka beddela qaabka iyagoo saameyn ku leh goob koronto, oo caadi ahaan loo isticmaalo dhaqaajiyeyaasha iyo dareemayaasha. Tusaalooyinka waxaa ka mid ah poly(3,4-ethylenedioxythiophene) (PEDOT), kaas oo loo isticmaalo aaladaha elektaroonigga ah sida shaashadaha taabashada.
Gabagabo
Falgallada Polymerization waa habab kiimiko oo aasaasi ah oo ka jira warshadaha kiimikada casriga ah, iyagoo u gogol xaaraya noocyo badan oo badeecooyin iyo codsiyo ah oo beddela nolosheenna maalinlaha ah. Annagoo fahmayna hababka iyo noocyada polymerization-ka, iyo sidoo kale codsiyadooda, waxaan horumarin karnaa agabyo cusub oo leh sifooyin la xoojiyay oo loogu talagalay baahiyaha mustaqbalka. Polymerization-ka ku darista iyo polymerization-ka isku-dhafka ah mid walba wuxuu door gaar ah ka ciyaaraa sameynta agabkan, sayniskuna wuxuu sii wadaa inuu horumar sameeyo si uu u helo siyaabo cusub oo lagu hagaajin karo hababkan loona helo codsiyo cusub oo loogu talagalay polymers-ka.
