Izindaba

Ukusetshenziswa kwamapulasitiki okwenziwa atholakala ku-petroleum kunenselelo ngenxa yezindaba ezaziwa kakhulu zokungcoliswa okumhlophe. Ukufuna izinsiza zekhabhoni evuselelekayo njengenye indlela sekubaluleke kakhulu futhi kuyaphuthuma. I-Polylactic acid (PLA) ibhekwa kabanzi njengenye indlela engase ibe khona esikhundleni sezinto ezivamile ezisekelwe ku-petroleum. Njengensiza evuselelekayo etholakala ku-biomass enezakhiwo ezifanele zemishini, i-biocompatibility enhle, kanye nokonakala, i-PLA ihlangabezane nokukhula kwemakethe okuqhumayo kumapulasitiki obunjiniyela, izinto ze-biomedical, izindwangu, izicelo zokupakisha zezimboni. Kodwa-ke, ukumelana nokushisa okuphansi kanye nokuqina okuphansi kunciphisa kakhulu uhla lwayo lwezinhlelo zokusebenza.

Ukuncibilika kwe-polylactic acid (PLA) kanye ne-thermoplastic silicone polyurethane (TPSiU) elastomer kwenziwa ukuze kuqiniswe i-PLA.

Imiphumela ibonise ukuthi i-TPSiU ihlanganiswe ngempumelelo ku-PLA, kodwa akukho ukusabela kwamakhemikhali okwenzeka. Ukwengezwa kwe-TPSiU akuzange kube nomphumela osobala ekushiseni kokuguqulwa kwengilazi kanye nezinga lokushisa elincibilikayo le-PLA, kodwa kunciphise kancane i-crystallinity ye-PLA.

Imiphumela ye-morphology kanye ne-dynamic mechanical analysis ibonise ukungahambisani kahle kwe-thermodynamic phakathi kwe-PLA ne-TPSiU.

Ucwaningo lokuziphatha kwe-Rheological lubonise ukuthi i-PLA/TPSiU iyancibilika yayiwuketshezi oluyi-pseudoplastic. Njengoba okuqukethwe kwe-TPSiU kwanda, i-viscosity ebonakalayo yenhlanganisela ye-PLA/TPSiU ibonise umkhuba wokukhuphuka kuqala bese wehla. Ukwengezwa kwe-TPSiU kube nomthelela omkhulu ezimpahleni zemishini zenhlanganisela ye-PLA/TPSiU. Lapho okuqukethwe kwe-TPSiU kungu-15 wt%, ukwelulwa ekunqamukeni kwenhlanganisela ye-PLA/TPSiU kufinyelele ku-22.3% (izikhathi ezingu-5.0 ze-PLA ehlanzekile), futhi amandla omthelela afinyelela ku-19.3 kJ/m2 (izikhathi ezingu-4.9 kune-PLA ehlanzekile), iphakamisa umphumela omuhle wokuqiniswa.

Uma iqhathaniswa ne-TPU, i-TPSiU inomphumela oqinisayo ongcono ku-PLA ngakolunye uhlangothi nokumelana nokushisa okungcono ngakolunye uhlangothi.

Nokho,SILIKE SI-TPViyi-elastomers esekelwe ku-Silicone-based elastomer eguquguqukayo eguquguqukayo enelungelo lobunikazi. Idonse ukukhathazeka okukhulu ngenxa yobuso bayo ngokuthinta okuhlukile okusilika futhi okuvumela isikhumba, ukumelana okuhle kakhulu nokuqoqwa kokungcola, ukumelana kangcono nokunwaya, ayiqukethe i-plasticizer namafutha athambisayo, akukho bungozi bokopha / okunamathelayo, akukho phunga.

Futhi, umphumela oqinile ongcono ku-PLA.

Le nto eyingqayizivele ephephile futhi evumelana nemvelo, inikeza inhlanganisela enhle yezakhiwo nezinzuzo ezivela ku-thermoplastics kanye nerabha ye-silicone exhunywe ngokuphelele. amasudi wendawo egqokekayo, amapulasitiki obunjiniyela, izinto ze-biomedical, izindwangu, izinhlelo zokusebenza zokupakisha zezimboni.

Ulwazi olungaphezulu, lucashunwe ku-Polymers (Basel). 2021 Jun; 13(12): 1953., Ukuguqulwa Okuqinile kwe-Polylactic Acid nge-Thermoplastic Silicone Polyurethane Elastomer. kanye ne-Super Tough Poly(Lactic Acid) Ihlanganisa Ukubuyekezwa Okuphelele”(RSC Adv., 2020,10,13316-13368)