PLA, thepa e ka senyehang, ke polymer e ka bang kristale e nang le mocheso o qhibilihang o fihlang ho 180 ℃.Joale ke hobane'ng ha thepa e le mpe hakaale ha e hanyetsa mocheso hang ha e etsoa?
Lebaka le ka sehloohong ke hore tekanyo ea crystallization ea PLA e lieha 'me crystallinity ea sehlahisoa e tlaase nakong ea ts'ebetso e tloaelehileng le ho bōptjoa.Mabapi le sebopeho sa lik'hemik'hale, ketane ea limolek'hule ea PLA e na le -CH3 ho athomo ea carbon ea chiral, e nang le sebopeho se tloaelehileng sa helical le mosebetsi o tlaase oa likarolo tsa ketane.Bokhoni ba kristale ba lisebelisoa tsa polymer bo amana haufi-ufi le ts'ebetso ea ketane ea limolek'hule le matla a nucleation.Ka mokhoa o pholileng oa mokhoa o tloaelehileng oa ho sebetsa, fensetere ea mocheso e loketseng bakeng sa crystallization e nyenyane haholo, e le hore crystallinity ea sehlahisoa sa ho qetela e be nyenyane 'me mocheso oa mocheso oa mocheso o tlaase.
Phetoho ea Nucleation ke mokhoa o atlehang oa ho eketsa crystallinity ea PLA, ho potlakisa sekhahla sa crystallization, ho ntlafatsa thepa ea crystallization 'me kahoo ho eketsa ho hanyetsa mocheso oa PLA.Ka hona, ho fetoloa ha lisebelisoa tsa PLA tse kang nucleation, phekolo ea mocheso le crosslinking ho na le karolo ea bohlokoa ho atoloseng mefuta e mengata ea kopo ea lihlahisoa tsa PLA ka ho eketsa mocheso oa mocheso oa mocheso le ho ntlafatsa mocheso oa mocheso.
Lisebelisoa tsa nucleating li arotsoe ka li-inorganic nucleating agents le li-organic nucleating agents.Li-inorganic nucleating agents haholo-holo li kenyelletsa phyllosilicates, hydroxyapatite le lihlahisoa tsa eona, lisebelisoa tsa carbon le li-nanoparticles tse ling.Letsopa ke mofuta o mong oa lisebelisoa tsa liminerale tsa silicate tse nang le marako tse sebelisoang hangata ho feto-fetoha ha PLA, tseo har'a tsona montmorillonite e leng moemeli ka ho fetisisa.Lintho tse ka sehloohong tsa organic nucleating agents ke: metsoako ea amide, bisylhydrazides le biurea, limolek'hule tse nyenyane tsa biomass, organometallic phosphorus/phosphonate le polyhedral oligosiloxy.
Ho eketsoa ha li-additives tse rarahaneng tsa nucleating ho ntlafatsa botsitso ba eona ba mocheso ho molemo ho feta li-additives tse le 'ngoe.Mofuta o ka sehloohong oa ho senyeha ha PLA ke hydrolysis ka mor'a hygroscopic, kahoo mokhoa oa ho qhibiliha ho qhibiliha o ka boela oa sebelisoa, ho eketsa oli ea hydrophobic additive dimethylsilicone ho fokotsa thepa ea hygroscopic, ho eketsa lisebelisoa tsa alkaline ho fokotsa sekhahla sa ho senyeha ha PLA ka ho fetola boleng ba PH ea PLA.
Nako ea poso: Nov-07-2022