E pili ana iā PLA
ʻO PLA, i ʻike ʻia he polylactide, he polyester polymerized mai ka waika lactic.ʻO ka polylactic acid he biodegradability maikaʻi loa, kūpono a me ka absorption.He mea ʻawaʻawa ʻole ia, ʻaʻole hoʻonāukiuki i ka polymer synthetic.ʻO kāna mea maka he lactic acid, ka mea i loaʻa mai ka fermentation o ka starch, e like me ke kulina a me ka raiki.Hiki ke loaʻa mai ka cellulose, ka ʻōpala kīhini a i ʻole ka ʻōpala iʻa.
Loaʻa i ka PLA ka nui o nā mea maka, a ʻo nā huahana i hana ʻia mai ia mea hiki ke hoʻopili pololei ʻia a i ʻole ke ahi, hiki ke hoʻokō i nā koi o ka hoʻomohala hoʻomau.ʻO ka māmā maikaʻi a me kekahi paʻakikī, biocompatibility a me ka pale wela o PLA ke kumu nui o kāna noi ākea.
Eia kekahi, he thermoplasticity ka PLA a hiki ke hoʻohana ʻia i nā māla he nui, e like me nā mea hoʻopihapiha, nā fibers, a me nā mea ʻē aʻe.
Ke hoʻohālikelike ʻia me nā huahana petrochemical kuʻuna, ʻo ka hoʻohana ʻana i ka ikehu i ka hana ʻana o ka polylactic acid he 20% a 50% wale nō o nā huahana petrochemical, a ʻo ka carbon dioxide i hana ʻia he 50% wale nō o nā huahana petrochemical.No laila, pono ka hoʻomohala ʻana i nā mea degradable polylactic acid e hōʻoluʻolu i nā pilikia o ka honua a me ka ikehu.
Nā hiʻohiʻona o PLA
1. Hiki i ka biodegradability
Ke hoʻohālikelike ʻia me nā plastics kahiko, hiki ke hoʻohaʻahaʻa ʻia ka polylactic acid i CO2 a me H2O e nā microorganism a me ka māmā.ʻAʻole ʻawaʻawa kona mau huahana hoʻohaʻahaʻa, ʻaʻole ia e hoʻohaumia i ke kaiapuni.ʻO ka monomer no ka hana ʻana i ka polylactic acid he lactic acid, hiki ke hoʻomoʻa ʻia e nā mea kanu e like me ka palaoa, raiki a me ke kō a i ʻole nā huahana mahiʻai.No laila, hiki ke hoʻololi ʻia ka mea maka no ka hana ʻana i ka polylactic acid.Hoʻohana nui ʻia ka polylactic acid ma ke ʻano he mea biodegradable e kū nei.
2. Biocompatibility a me Absorbability
Hiki ke hoʻoheheʻe ʻia ka waika polylactic e ka waikawa a i ʻole ka enzyme e hana ai i ka waikawa lactic i loko o ke kino kanaka.Ma ke ʻano he metabolite o nā cell, hiki ke hoʻololi hou ʻia ka waikawa lactic e nā enzymes i loko o ke kino, e hana i CO2 a me H2O.No laila, ʻaʻohe mea ʻawaʻawa a polylactic acid i ke kino o ke kanaka, ʻoi aku ka maikaʻi o ka biocompatibility a me ka bioabsorbability.Ua hōʻoia ʻia ka polylactic acid e ka US Food and Drug Administration e hiki ke hoʻohana ʻia ma ke ʻano he biomaterial no ke kanu ʻana i nā kānaka.
3. Hiki i ke kino
Ma ke ʻano he thermoplastic polymer material, polylactic acid he plasticity maikaʻi a me nā waiwai hoʻoili kino, me ka helu hoʻoheheʻe kiʻekiʻe a me ka crysallinity, ka elasticity maikaʻi a me ka flexibilit, a me ka thermoformability maikaʻi loa.ʻO nā mea waika polylactic, e like me nā mea polymer e like me ka polypropylene (PP), polystyrene (PS), a me ka polyphenylene ether resin (PPO), hiki ke hana ʻia e ka extrusion, stretching, a me ka hoʻoheheʻe ʻana i ka pupuhi.
Ka manawa hoʻouna: ʻAukake-18-2023
