PLA, walxo biodegradable ah, waa polymer semi-crystalline leh heerkul dhalaal ilaa 180 ℃.Haddaba waa maxay sababta maaddadu ay aad ugu xun tahay iska caabbinta kulaylka marka la sameeyo?
Sababta ugu weyn ayaa ah in heerka crystallization ee PLA uu yahay mid gaabis ah iyo crystallinity ee alaabtu ku yar tahay habka habaynta iyo qaabaynta caadiga ah.Marka la eego qaab dhismeedka kiimikada, silsiladda molecular ee PLA waxaa ku jira a -CH3 atamka kaarboonka chiral, kaas oo leh qaab dhismeed caadi ah iyo dhaqdhaqaaq hoose ee qaybaha silsiladaha.Awoodda crystallization ee alaabta polymer waxay si dhow ula xiriirtaa waxqabadka silsiladda molecular iyo awoodda nukliyeerka.Habka qaboojinta ee qaabaynta caadiga ah, daaqada heerkulka ku habboon crystallization aad bay u yar tahay, si crystallinity ee alaabta kama dambaysta ah ay yar tahay heerkulka qallafsanaanta kulaylkuna waa hooseeyaa.
Wax ka beddelka Nukliyeerku waa hab wax ku ool ah oo lagu kordhinayo crystallinity ee PLA, dardargelinta heerka crystallization, hagaajin hantida crystallization iyo sidaas kordhin caabbinta kulaylka ee PLA.Sidaa darteed, wax ka beddelka agabka PLA sida nucleation-ka, daawaynta kulaylka iyo isgoysyada ayaa door muhiim ah ku leh ballaarinta kala duwanaanshaha codsiga ee alaabada PLA iyadoo kordhinaysa heerkulkeeda qallafsanaanta kulaylka iyo hagaajinta caabbinta kulaylka.
Waxyaalaha nukliyeerka ah waxay u qaybsan yihiin maaddooyinka nukliyeerka ah ee aan noolaha ahayn iyo wakiilada nukleye-ka organic.Waxyaalaha nukliyeerka ah ee aan noolaha lahayn inta badan waxaa ka mid ah phyllosilicates, hydroxyapatite iyo kuwa ka soo jeeda, alaabta kaarboonka iyo nanoparticles kale ee aan organic.Clay waa nooc kale oo ka mid ah walxaha macdanta silicate ee lakabka ah oo caadi ahaan loo isticmaalo wax ka beddelka PLA, kaas oo montmorillonite uu yahay kan ugu badan.Walxaha nukliyeerka ah ee ugu muhiimsan waa: xeryahooda amide, bisylhydrazides iyo biureas, biomass molecules yaryar, fosfooraska organometallic / fosfooraska iyo oligosiloxy polyhedral.
Ku darida walxaha nukliyeerka ee adag si loo hagaajiyo xasilloonida kulaylka ayaa ka fiican kuwa hal-abuurka ah.Qaabka ugu weyn ee hoos u dhaca PLA waa hydrolysis ka dib hygroscopic, sidaas darteed habka isku-dhafka dhalaalka ayaa sidoo kale loo isticmaali karaa, iyadoo lagu darayo saliidda dimethylsilicone ee lagu daro hydrophobic si loo yareeyo hantida hygroscopic, ku darista daroogooyinka alkaline si loo yareeyo heerka hoos u dhaca ee PLA iyadoo la bedelayo qiimaha PH ee PLA.
Waqtiga boostada: Nov-07-2022