Waxyaabaha saameeya hydrolysis of polylactic acid (pla)
2023,11,20
Waqtigan xaadirka ah, wax soo saarka sanadlaha ah ee adduunka ee ku saabsan 140 milyan oo tan, ka dib markii la adeegsanayo qashin-qubka 50% ilaa 60 milyan oo wax soo saarka, taasoo dhalisay biyaha dhulka hoostiisa, ee wasakhaysan, qatar gelinta Kobaca dhirta iyo xayawaanku, oo ku hanjabaad ku-noolaanshaha bina-aadamka iyo caafimaadka, iyo noqoshada dambiilaha ugu waaweyn ee dunida ee wasakhda cad. Markii dadku siiyaan fiiro badan oo dheeri ah arrimaha deegaanka, balaastikada bayaannada ayaa si tartiib tartiib ah loo door bidaa. Sida polyatic-ga bey'adda u fiican ee alitatic-ka, polyylactic acid (PLA) sidoo kale waa mid ka mid ah noocyada ugu badan ee loo isticmaalo agab ku saleysan ee ku saleysan agab ku saleysan noolaha . Iyada oo leh biocompattate-ka wanaagsan, xayiraadda iyo guryaha wanaagsan ee lagu farsameeyo, PLA waxay heshay fiiro baahsan oo waxaa loo arkaa inay tahay mid ka mid ah kuwa ugu horumarsanaanta "Eco-Alaabtii" si loo beddelo balaastigga jira. 1. Habka 1.Datida ee POLLYALLICIC Acid (PLA) Sida qalabka polyster, nabaad-guurka polylactic acid ayaa loo qaybiyaa xaalufinta fudud ee hydrolytic iyo xaalufinta enzyme-cagaaran. Nabaad-xumada fudud ee hydrolytic waa falcelinta soo socota ee ka soo horjeedda ee eccication, laga bilaabo nuugista biyaha, unugyada yaryar ee biyuhu waxay u dhaqaaqeen salka muunadda, oo ku yaal kooxo hydrophilic-ka ah ee ku saabsan doorka aashitada iyo aashitada dhexdhexaadka ah, ester Buundada haraaga haraaga ah, muunadda molecule-ka, qaddarka hoos udhaca tartiib tartiib tartiib tartiib tartiib tartiib tartiib tartiib tartiib tartiib tartiib tartiib tartiib tartiib tartiib tartiib tartiib tartiib tartiib tartiib tartiib tartiib tartiib tartiib tartiib tartiib tartiib tartiib tartiib tartiib tartiib tartiib tartiib tartiib tartiib tartiib tartiib tartiib tartiib tartiib tartiib tartiib tartiib tartiib tartiib tartiib ah u yareeyso, Naxdinta enzymatic ee polylactoside waa mid aan toos ahayn, patylactic acid acid hydrolysis-ka hore waxay dhacdaa, hydrolysis illaa xad, iyo dheef-shiid kiimikaad oo dheeri ah oo ku saabsan ficilka enzymes, si nidaamka nabaad-guurka la dhammaystiro.
2.Fathers-ka saameeya hydrolysis iyo nabaad-guurka aashitada pollus Waxyaabaha saameeya hydrolysis of plda waxaa loo qaybin karaa laba qaybood: guryaha aaladda iyo xaaladaha hydrolysis. Guryaha sheyga waxaa ka mid ah qaab-dhismeedka molikal, cryststallallallanity, cabirka miisaanka iyo qaybinta, qaabka muujinta qaabka iyo cabirka, hanaanka wasakhda ah, waxyaabaha lagu daro, iwm. Xaaladaha hydrolysis-ka waxaa ka mid ah pH, heerkulka, huurka, dieltric joogto ah, daaweynta joodar, iwm. 3. Saamaynta qaab dhismeedka molikal Qaab dhismeedka molikalku waa qodob muhiim ah oo saameeya astaamaha agabyada ku saleysan PLA. Baarayaasha qaar waxay diyaariyeen 3-hubeysan, 4-hubeysan iyo pla-hudheel badan oo hubaysan iyo kuwa kale ee hubka leh iyo kuwa kale ee badan Falanqaynta waxaa laga yaabaa inay sabab u tahay xaqiiqda in polymers ay kujirto qaab dhismeedka la jajaban ay leeyihiin dhallaanka hoos udhaca iyo kooxaha joogtada ah, sidaa darteedna aad uga dhakhso badan yihiin kuwa qaba qaabdhismeedka toosan. Dadku waxay beddelaan qaab dhismeedka molikal ee pla-ka pla-ka ee loo habeeyo wax ka badalida coposolymization iyo isku-darka noocyada kala duwan ee cotamyers oo leh pla sida matrix si ay u xakameeyaan heerka hydrolysis. Tusaale ahaan, plga copolymer, soo bandhigida peg kaliya ma fiicna biyo-galka PLA waxayna yareysaa burburka cudurka polymer, laakiin sidoo kale waxay siisaa sheyga guryaha iyo howlaha cusub. Biyo-baxayaasha kooxda soo kortay waxay door muhiim ah ka qaadataa habka hydrolysiysis ee polymers ee wax ka beddelka iskudarka, sida ugu fiican ee ku-dhajinta, ayaa ah mid aad u sharaf dhac ah.
4. Saamaynta Crystallallinal PLA waxay ka tirsan tahay qalabka polyester-ka crystalline, laakiin xitaa haddii pla ay ka tirsan tahay aaladda polyester-ka crystalline, oo aan la gaari karin 100% ama walxaha ayaa loo kala qaybiyaa aag Crystalline ah iyo aag amorphous (aag amorphous). Geedi socodka hydrolysis ee pla, hydrolysis had iyo jeer waxay ku dhacdaa marka hore aagga amorprous. Biyo ayaa ka hor galaya aagga amorphphous, si debaajiga denbi-guurka aagga amorouspous-ka la jabay, marka inta badan amorouspyzed, kaliya geeska illaa xarunta aagga crystallone-ka ayaa ka bilaabmaya hydrololyeze. Waa in la ogaadaa in, habka loo qabo pla hydrolysis, oo inta badan la socda ifafaale of crypstallin dhaleen, oo laga yaabo inay sabab u tahay hydrolysis-ka aagga amorephous, oo ah jiilka joogtada qaab dhismeedka ah ee walxaha dheer ee molika-ka, samaynta pla Crystallinalnatine ayaa kordhay. Baarayaasha qaarkood waxay aaminsan yihiin in kororka kareemka ah uu sabab u yahay hydrolysis-ka aagga amorphaus, kaas oo kordhiya saamiga aaga crystalline-ka muunadda harsan. 5. Saamaynta joogtada ah ee qaab dhismeedka cubic Sababta oo ah ismirashada indhaha ee iswada ee lactac acid, PLA sidoo kale waxay leedahay xabado kaladuwan, plla, oo ay sameeyaan polymprization acid saafi ah; PDLA, oo ay sameeyaan polympisization acid saafi ah oo saafi ah; Pdlla, oo ay sameeyaan polymomerization ee plasis-ka yar ee iftiinka yar ee iftiinka leh ee saamiga cayiman ee aashitada qaarkood iyo d-lactic acid; iyo p (l / d) la, oo lagu sameeyo is-dhex-gelinta PLLA iyo PDLA saamiga gaar ah. Baaraha cilmi-baaraha isbarbardhiga hydrolysis ee plla, pdlla, PDLA, PDLA, iyo P (L / D) LA, iyo natiijooyinka waxay muujiyeen in PDLA ay ugu fududdahay in lagu faafiyo. Plla iyo PDLA ayaa ku soo muuqday ee ugu sahlan ee lagu soo bandhigayo hydrololyez, iyo p (l / d) LA oo ay ku hayaan caabbinta hydrolysis-ka ugu adag.
