Cov yam ntxwv thiab kev siv ntawm PHA

Polyhydroxyalkanoate (PHA), ib qho intracellular polyester synthesized los ntawm ntau cov kab mob, yog ib tug natural polymer biomaterial.

Characteristics of PHA

Biodegradability: PHA yog spontaneously biodegradable, tsis muaj composting, nws yuav biodegraded nyob rau hauv av thiab dej, nyob rau hauv aerobic thiab anaerobic tej yam kev mob, thiab lub sij hawm degradation yog tswj, nyob ntawm seb muaj pes tsawg leeg thiab loj ntawm cov khoom PHA thiab lwm yam sab nraud.Nyob ntawm ib puag ncig, tus nqi degradation ntawm PHA yog 2 mus rau 5 npaug sai dua li cov khoom siv biodegradable polycaprolactone (PCL) lossis lwm yam khoom siv degradable aliphatic polyesters;Thaum qhov ze tshaj PHA yog polylactic acid (PLA) Biodegradation yuav tsis yooj yim tshwm sim hauv qab 60 degrees Celsius.

Zoo biocompatibility: PHA tuaj yeem degraded mus rau hauv me me molecular oligomers los yog monomer Cheebtsam nyob rau hauv lub cev, uas yog non-toxic thiab harmless rau kab mob, thiab yuav tsis ua rau tsis lees paub.Yog li ntawd, nws tuaj yeem siv rau cov pob txha pob txha, cov tshuaj tiv thaiv-tso tawm thiab lwm yam.Nyob rau hauv 2007, lub absorbable suture (TephaFLEX®) ua los ntawm P4HB tau pom zoo los ntawm US FDA thiab tau los ua lub ntiaj teb no thawj coj mus muag khoom kho mob PHA.Tam sim no, lub ntiaj teb tab tom kawm ntau ntxiv txog kev siv PHA hauv ntau qhov chaw xws li cov ntaub so ntswg engineering, cov khoom siv cog qoob loo, thiab cov khoom siv tshuaj tiv thaiv kev tso tawm.

Cov cuab yeej zoo sib xws: nws tuaj yeem siv ua ke nrog lwm cov ntaub ntawv.Piv txwv li, PHA tuaj yeem sib xyaw nrog cov ntawv ua cov ntawv ntim nrog cov khoom tshwj xeeb;los yog compounded nrog hlau, txhuas, tin thiab lwm yam ntaub ntawv hlau, thiab tseem tuaj yeem sib xyaw nrog cov tshauv ya los txhim kho cov thermal kev ua tau zoo thiab toughness ntawm PHA;Tsis tas li ntawd, PHA thiab calcium silicate Compounding yog siv los ua kom tus nqi degradation ntawm PHA thiab daws qhov teeb meem ntawm tus nqi pH qis tom qab PHA degradation;nws tseem tuaj yeem sib xyaw nrog qee cov inorganic curing agents los tsim cov ntaub ntawv txheej nrog cov dej tsis zoo.

Gas barrier zog: PHA muaj cov roj barrier zoo thiab tuaj yeem siv rau hauv cov ntim khoom tshiab;hydrolytic stability: muaj zog hydrophobicity, siv nyob rau hauv zus tau tej cov tableware;nonlinear optics: PHA muaj kev ua haujlwm kho qhov muag, thiab txhua chav tsev tsim muaj A chiral carbon tuaj yeem siv rau chromatographic tsom xam cais cov isomers optical;UV stability: Piv nrog rau lwm cov polyolefins thiab polyaromatic polymers, nws muaj UV stability zoo dua.

Daim ntawv thovsntawm PHA

1. Biomedical cov ntaub ntawv.PHA feem ntau yog siv rau hauv kev kho mob los tsim cov phais phais, staples, cov pob txha hloov, hloov cov hlab ntsha, cov tshuaj tiv thaiv-tso tawm, hnab looj tes kho mob, cov ntaub ntawv hnav khaub ncaws, tampons, cov yeeb yaj kiab kho mob, thiab lwm yam.

2. Biodegradable ntim cov ntaub ntawv thiab cov khoom siv dej tsis zoo thiab cov khoom siv ruaj khov xws li cov khoom siv tu cev, cov pawm, cov tshuaj pleev ib ce (exfoliating agents hauv tshuaj pleev ib ce, lub raj mis hauv ob sab phlu), thiab lwm yam.

3. Cov khoom siv.Rooj tog, tableware, tsom iav, hluav taws xob hloov, tsheb sab hauv, thiab lwm yam.

4. Agricultural khoom.Biodegradable cab kuj ntawm tshuaj tua kab thiab chiv, yas zaj duab xis, thiab lwm yam.

5. Tshuaj lom neeg thiab cov kuab tshuaj.Cov tshuaj ntxuav, dyes, cov kuab tshuaj kuab tshuaj, cov nplaum, cov khoom siv kho qhov muag.

6. Siv los ua cov khoom siv rau cov khoom siv thermosetting (polyurethane thiab unsaturated polyester resins).