Izinto ezichaphazela i-hydrolysis ye-polylactic acid (pla)
November 20, 2023
Okwangoku, ukuveliswa konyaka wehlabathi malunga neetoni ezizigidi ezili-140, emva kokusetyenziswa kwenkunkuma ibalelwa malunga ne-50% ukuya kwi-60% yeengcambu zeemveliso zomhlaba, kubangela ukungcola komhlaba kunye nokungcola komhlaba, ukubengezela Ukukhula kwezityalo kunye nezilwanyana, kusongela ukusinda kwabantu kunye nempilo, kwaye ube ngabantu abaphambili behlabathi longcoliseko olumhlophe. Njengoko abantu behlawula ngakumbi kwimiba yokusingqongileyo, iiplasitiki ezinokuhlelwa ngokuthe ngcembe. Njenge-polyester enobubele bendalo, i-polylactic acid (i-pla) yenye yezona ntlobo zisetyenzisiweyo zezinto ezisekwe kwi-bio-esekwe . Ngoncedo oluhle lwe-biomative, ukungcola kunye neepropathi zokulungisa ezibalaseleyo, iplanti ifumene ingqalelo ebanzi kwaye ithathwa njengenye yezona ndlela zintsha zithembisayo " 1.Ukusebenza kwenkqubo ye -Polylactic Acid (PLA) Njengezinto eziphathekayo, ukonakala kwe -pollactic acid yahlulahlulwe yaba yinto elula yokonakaliswa kwe-enzymegetication kunye ne-enzyme-cataeving. Ukupheliswa okulula kwe-hydrolytic yindlela engasasebenziyo yokufunda, ukuqala ukusuka ekufumaneni amanzi, iimolekyuli ezincinci zamanzi ezifudukele kwindima ye-Acid kunye ne-HYDROPIC kwindima ye-Acid no-Alkali kwiPhakade, i-Ester Ibhondi i-hydrolysis physis, isampulu yemolekyuli, isixa sokunciphisa kancinci kwisisindo semolekyuli xa ubunzima bemolekyuli buncitshiswa ukuya kuthi ga kwinqanaba elithile, isampulu yaqala ukunyibilika, ukuvelisa iimveliso zokuphelisa inyikima. Ukupheliswa kwe-enzymatic yePolylatike kungathangani, i-Polylactic Acid ivela kwi-hydrolysis yokuqala, kwaye i-hydrolysis kwinqanaba elithile, kunye ne-metabolism ethile phantsi kwesenzo se-enzyme, ukuze inkqubo yokonakaliswa inokugqitywa.
I-2FAtors ichaphazela i-hydrolysis kunye nokupheliswa kwe -polylactic acid Izinto ezichaphazela i-hydrolysis ye-play inoko zahlulwe zangamacandelo amabini: Iipropathi zezinto ezibonakalayo kunye neemeko ze-hydrolysis. Iipropathi zezinto ezibonakalayo zibandakanya ubume bemolekyuli, i-crystallinity, ubungakanani bobunzima bemolekyuli kunye nokusasaza, ubume besampulu, inkqubo yokubumba, i-sportimes, Iimeko ze-hydrolysis zibandakanya i-PH, iqondo lobushushu kunye nomphunga, iDelector rhoqo, unyango lwemitha, njl njl. 3. Impembelelo yesakhiwo seMolekyuli Ulwakhiwo lweMolekyuli yinto ebalulekileyo echaphazela iipropathi zezinto ezisekwe kwi-pla-. Abanye abaphengululi balungiselela i-3-otd, i-4-off kunye nelinye i-plus elixhobileyo esebenzisa iipropathi ezahlukeneyo zokufunda i-hydrolysis, kwaye ifumene inani lamakhonkco afanayo, okhawulezayo ukonakaliswa kwenqanaba. Uhlalutyo lunokubangelwa yinto yokuba i-polymers equlatha izakhiwo ezitshatileyo zine-crystallinity ephantsi kunye namaqela e-terstality, kwaye ke kuncitshiswa ngokukhawuleza kunolwakhiwo lwezakhiwo ezikumgangatho. Abantu batshintsha isakhiwo se-molecular se-spolymerization kwaye siqokelele iintlobo ngeentlobo ze-copolymers nge-platrix ukuba i-matrix ilawule ireyithi yayo ye-hydrolysis. Umzekelo, i-PLGA Copolymer, ukungeniswa kwe-PEG ayiphumi nje i-hydrophicicity ye-plare kwaye ikhupha i-crystallity ye-polymer, kodwa ikwanika izinto ezintsha zemisebenzi nemisebenzi. I-hydrophility yeqela elingenisiweyo idlala indima ethatha isigqibo kwinkqubo ye-hydrolysis ye- polymers kwinguqulelo yokudibanisa, engcono i-hydrodicity, eyona nto ibalulekileyo.
4. Impembelelo ye-crystallies IPlati ye-crystallie yezinto eziphathekayo, kodwa nokuba i-Estestallie Pontuster, i-crystallise ingafikeleli kwi-100%, kwaye isuntswana okanye isuntswana lahlulwe yindawo ye-crystalline ne-Amorphous (iAmorphous). Kwinkqubo ye-hydrolysis ye-pla, i-hydrolysis ihlala yenzeka kuqala kwindawo ye-amororis. Amanzi kuqala angena kwiNdawo ye-amorphous, ukuze i-Ester Sond kwiNdawo ye-Amorphous iphukile, kuphela ukusuka kumda we-hydrolyzed, kuphela ukusuka embindini we-crystalline. Kuya kufuneka kuqatshelwe ukuba, kwinkqubo ye-hydrolysis, ihlala ihamba kunye ne-phenomenon yokunyusa i-crystallied, enokubangelwa yi-hydrolysis yendawo ye-amorrolysis, isizukulwana seqela lezinto eziphantsi kwe-molecular, esenza iPlati I-Crystallinity inyuke. Abanye abaphengululi bakholelwa ukuba ukwanda kwe-crystalliety kungenxa ye-hydrolysis yendawo ye-amorrolymis, enyusa umda wendawo ye-crystalline kwisampuli eseleyo. 5. Impembelelo kubume bobuchule bobuchule be-cubize Ngenxa ye-isomerical ye-ismoris, ifLA, inee-cube ezahlukeneyo, iPlan, eyenziwe ngePolymerization ye-Actic ecocekileyo ye-L-lactic; I-PDLA, eyenziwe yipolitionration ye-acic ecocekileyo ye-D-lactic acid; I-PDLA, eyenziwe nge-polymerizazation ye-plari eyodwa ecocekileyo kumyinge othile we-L-lactic acid kunye ne-d-lactic acid; kunye p (L / d) LA, eyenziwe ngokuxuba i-PLA kunye ne-PLA kunye nePDLA kumyinge othile. Umphandi uthelekisa iipropathi ze-hldrolysis yePla, i-PDLA, pdlla, kunye p (l) la, kwaye iziphumo zibonise ukuba i-PDLA yeyona nto ilula kakhulu; I-Pla kwaye i-PDLA yayiyindawo elandelayo kwi-hydrolyze, kunye p (L) la yayinesona sithintelo i-hydrolysis eyomeleleyo.
