PLA, iyo biodegradable material, isemi-crystalline polima ine tembiricha yekunyunguduka inosvika 180 ℃.Saka nei zvinhu zvacho zvakashata pakupisa kupisa kana zvangogadzirwa?
Chikonzero chikuru ndechekuti crystallization rate yePLA inononoka uye crystallinity yechigadzirwa yakadzikira mukuita kwakajairika kugadzirisa uye kuumba.Panyaya yechimiro chemakemikari, iyo molecular chain yePLA ine -CH3 pane chiral kabhoni atomu, ine yakajairwa helical chimiro uye yakaderera basa rezvikamu zveketani.Iyo crystallization kugona kwezvinhu zvepolymer ine hukama zvakanyanya nebasa remamorekuru cheni uye nucleation kugona.Mukuita kutonhora kweyakajairwa kugadzirisa kuumbwa, hwindo rekushisa rakakodzera crystallization idiki kwazvo, kuitira kuti crystallinity yechigadzirwa chekupedzisira idiki uye tembiricha yekupisa yakadzikira.
Nucleation modification inzira inoshanda yekuwedzera crystallinity yePLA, kukurumidza kukurumidza kristalllization rate, kuvandudza crystallization pfuma uye nokudaro kuwedzera kupisa kwePLA.Nokudaro, kuchinjwa kwezvinhu zvePLA zvakadai se nucleation, kupisa kupisa uye crosslinking kune basa rinokosha pakuwedzera kushandiswa kwezvigadzirwa zvePLA nekuwedzera kupisa kwayo kwekushisa uye kuvandudza kupisa kwayo.
Nucleating agents akakamurwa kuita inorganic nucleating agents uye organic nucleating agents.Inorganic nucleating agents anonyanya kusanganisira phyllosilicates, hydroxyapatite uye zvinobva mairi, kabhoni zvinhu uye mamwe inorganic nanoparticles.Clay ndeimwe mhando yeakaturikidzana silicate zvicherwa zvicherwa zvinowanzoshandiswa mukugadziriswa kwePLA, pakati peiyo montmorillonite ndiyo inomiririra zvakanyanya.Iwo makuru organic nucleating agents ndeaya: amide makomisheni, bisylhydrazides uye biureas, biomass madiki mamorekuru, organometallic phosphorus/phosphonate uye polyhedral oligosiloxy.
Kuwedzerwa kwezvakaoma nucleating additives kuti ivandudze kugadzikana kwayo kwekushisa kuri nani pane iyo yekuwedzera imwe chete.Nzira huru yekusvibisa yePLA ndeye hydrolysis mushure me hygroscopic, saka nzira yekunyunguduka kusanganiswa inogonawo kushandiswa, kuwedzera hydrophobic additive dimethylsilicone mafuta kuderedza hygroscopic property, kuwedzera alkaline additives kuderedza kuparara kwePLA nekushandura PH kukosha kwePLA.
Nguva yekutumira: Nov-07-2022