Nkhani

Kugwiritsa ntchito mapulasitiki opangidwa kuchokera ku mafuta kukuvutitsidwa chifukwa cha nkhani zodziwika bwino za kuipitsidwa koyera. Kufunafuna zinthu zobwezerezedwanso za kaboni ngati njira ina kwakhala kofunika kwambiri komanso kofunikira. Polylactic acid (PLA) yakhala ikuonedwa kuti ndi njira ina yosinthira zinthu zachikhalidwe zopangidwa ndi mafuta. Monga chuma chobwezerezedwanso chochokera ku biomass chokhala ndi makhalidwe oyenera amakina, kuyanjana bwino kwa biomaterial, komanso kuwonongeka, PLA yakhala ikukula kwambiri pamsika wa mapulasitiki opanga mainjiniya, zinthu zamankhwala, nsalu, ndi ma phukusi amafakitale. Komabe, kukana kutentha kochepa komanso kulimba kochepa kumalepheretsa kwambiri ntchito zake.

Kusakaniza kwa polylactic acid (PLA) ndi thermoplastic silicone polyurethane (TPSiU) elastomer kunachitidwa kuti PLA ikhale yolimba.

Zotsatira zake zinasonyeza kuti TPSiU inasakanizidwa bwino ndi PLA, koma palibe mankhwala omwe adachitika. Kuwonjezera kwa TPSiU sikunakhudze kutentha kwa kusintha kwa galasi ndi kutentha kwa kusungunuka kwa PLA, koma kunachepetsa pang'ono mphamvu ya PLA.

Zotsatira za kapangidwe kake ndi kusanthula kwa makina osinthika zawonetsa kusagwirizana koipa kwa thermodynamic pakati pa PLA ndi TPSiU.

Kafukufuku wa machitidwe a rheological adawonetsa kuti kusungunuka kwa PLA/TPSiU nthawi zambiri kumakhala madzi apulasitiki. Pamene kuchuluka kwa TPSiU kukuwonjezeka, kukhuthala kwa zosakaniza za PLA/TPSiU kunawonetsa kukwera koyamba kenako kutsika. Kuwonjezeredwa kwa TPSiU kunakhudza kwambiri mawonekedwe a makina a zosakaniza za PLA/TPSiU. Pamene kuchuluka kwa TPSiU kunali 15 wt%, kutalika kwa kusweka kwa chosakaniza cha PLA/TPSiU kunafika 22.3% (nthawi 5.0 kuposa PLA yoyera), ndipo mphamvu yokhudza inafika 19.3 kJ/m2 (nthawi 4.9 kuposa PLA yoyera), zomwe zikusonyeza kuti mphamvu yake inali yolimba.

Poyerekeza ndi TPU, TPSiU ili ndi mphamvu yolimba pa PLA mbali imodzi ndipo imakana kutentha mbali inayo.

Komabe,SILIKE SI-TPVNdi ma elastomer okhala ndi thermoplastic thermoplastic otchedwa Silicone. Akuda nkhawa kwambiri chifukwa cha pamwamba pake pomwe ali ndi kukhudza kwapadera komanso kogwirizana ndi khungu, kukana bwino kusonkhanitsa dothi, kukana kukanda bwino, kusakhala ndi pulasitiki ndi mafuta ofewetsa, kusakhala ndi chiopsezo chotuluka magazi/kumata, komanso kusakhala ndi fungo loipa.

Komanso, mphamvu yabwino yolimbitsa PLA.

Zipangizo zapaderazi zotetezeka komanso zosawononga chilengedwe, zimapereka kuphatikiza kwabwino kwa zinthu ndi ubwino wochokera ku thermoplastics ndi rabara ya silicone yolumikizidwa bwino, yoyenera malo ovalidwa, mapulasitiki aukadaulo, zipangizo zamankhwala, nsalu, ndi ma phukusi amafakitale.

Zomwe zili pamwambapa, zochokera ku Polymers (Basel). 2021 Jun; 13(12): 1953., Kusintha Kolimba kwa Polylactic Acid ndi Thermoplastic Silicone Polyurethane Elastomer. ndi, Super Tough Poly(Lactic Acid) Blends A Comprehensive Review” (RSC Adv., 2020,10,13316-13368)