Izindaba

Ukusetshenziswa kwepulasitiki zokwenziwa ezithathwe kuphethiloli kuyinselele ngenxa yezinkinga ezaziwayo kakhulu zokungcola okumhlophe. Ukufuna izinsizakusebenza zekhabhoni evuselelekayo njengendlela ehlukile sekuye kwaba okubaluleke kakhulu futhi okuphuthumayo. I-Polylactic acid (PLA) ibilokhu ibhekwa kabanzi njengendlela engaba khona yokufaka esikhundleni sezinto ezivamile ezisekelwe kuphethiloli. Njengomthombo ovuselelekayo otholakala ku-biomass onezakhiwo ezifanele zemishini, ukuhambisana okuhle kwezinto eziphilayo, kanye nokubola, i-PLA ihlangabezane nokukhula okukhulu kwemakethe kumapulasitiki obunjiniyela, izinto zokwelapha, izindwangu, izinhlelo zokupakisha zezimboni. Kodwa-ke, ukumelana kwayo nokushisa okuphansi kanye nokuqina okuphansi kunciphisa kakhulu ububanzi bezicelo zayo.

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

Imiphumela ibonise ukuthi i-TPSiU ihlanganiswe ngempumelelo ne-PLA, kodwa akukho ukusabela kwamakhemikhali okwenzekayo. Ukwengezwa kwe-TPSiU akubanga nomthelela ocacile ekushiseni kokuguquka kwengilazi kanye nokushisa kokuncibilika kwe-PLA, kodwa kunciphisa kancane ukwakheka kwe-PLA.

Imiphumela yokuhlaziywa kwesimo kanye nobuchwepheshe be-dynamic mechanical ibonise ukuhambisana okungekuhle kwe-thermodynamic phakathi kwe-PLA kanye ne-TPSiU.

Izifundo zokuziphatha kwe-rheological zikhombisile ukuthi ukuncibilika kwe-PLA/TPSiU ngokuvamile kwakuyi-pseudoplastic fluid. Njengoba okuqukethwe kwe-TPSiU kwanda, i-viscosity ebonakalayo yezingxube ze-PLA/TPSiU ibonise ukuthambekela kokunyuka kuqala bese kwehla. Ukwengezwa kwe-TPSiU kwaba nomthelela omkhulu ezimpahleni zemishini yezingxube ze-PLA/TPSiU. Lapho okuqukethwe kwe-TPSiU kungu-15 wt%, ukunwebeka lapho kuphuka ingxube ye-PLA/TPSiU kufinyelele ku-22.3% (izikhathi eziphindwe ka-5.0 kune-PLA emsulwa), kanye namandla omthelela afinyelela ku-19.3 kJ/m2 (izikhathi eziphindwe ka-4.9 kune-PLA emsulwa), okuphakamisa umphumela omuhle wokuqina.

Uma kuqhathaniswa ne-TPU, i-TPSiU inomphumela wokuqinisa ongcono ku-PLA ngakolunye uhlangothi kanye nokumelana nokushisa okungcono ngakolunye uhlangothi.

Nokho,I-SILIKE SI-TPViyi-elastomer esuselwe ku-Silicone eguquguqukayo ene-thermoplastic evulcanized. Ikhanga kakhulu ngenxa yokuthi ingaphezulu layo lithinta ngendlela ehlukile futhi evumelana nesikhumba, ukumelana okuhle kakhulu nokuqoqwa kokungcola, ukumelana okungcono kokuklwebheka, ayinayo i-plasticizer namafutha okuthambisa, ayinayo ingozi yokopha/yokunamathela, ayinaphunga.

Futhi, umphumela ongcono wokuqinisa ku-PLA.

Le nto eyingqayizivele ephephile futhi enobungani nemvelo, inikeza inhlanganisela enhle yezakhiwo nezinzuzo ezivela kuma-thermoplastics kanye nerabha ye-silicone exhumene ngokuphelele, ifanele indawo egqokwayo, amapulasitiki obunjiniyela, izinto zokwelapha, izindwangu, nezicelo zokupakisha zezimboni.

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