Kalit so‘zlar
Iqtibos keltirish tartibi
Annotatsiya
Ushbu maqolada ipakchilik chiqindilaridan (tivit) sintez qilingan karboksimetilxitozanning (KMX) kislota-asos va amfoter xususiyatlarini o‘rganish, shuningdek uning termik barqarorligini baholash tadqiqot natijalari keltirilgan. KMX tivitdan xitin ajratish, deasetillash va karboksimetillash bosqichlari orqali olindi. O‘rin bosish darajasi DS=0,67 (potensiometrik titrlash). Amfoterlik potensiometrik titrlash ( va ni aniqlash), pH 4-10 oralig‘ida eruvchanlik va ζ-potentsial (elektroforetik yorug‘lik sochilishi) yordamida o‘rganildi. Termik barqarorlik TGA/DSC usullari bilan inert atmosferada ( , 30-600°C, 10°C/min) baholandi. Tuzilish FTIR va elementar tahlil bilan tasdiqlandi. Potensiometrik titrlash ikkita dissotsiatsiya konstantasini aniqladi: =3,2±0,1 (karboksil guruhi) va =6,8±0,1 (aminoguruh). Izoelektrik nuqta pI = 5,0. KMX ning eruvchanligi pH 5,0 da minimal (42%) va pH >7,0 da 95% dan yuqori. ζ-potentsial +25 mV (pH 3,0) dan -25 mV (pH 9,0) gacha o‘zgaradi, bu kolloid barqarorlikni ta’minlaydi (|ζ| > 20 mV). TGA natijalari: Tboshl = 232 °C, = 298 °C, 600 °C da qoldiq 23% (karbonizatsiyalangan uglerod). DSC yordamida 85 °C da endotermik cho‘qqi hamda 302 °C va 450 °C da ekzotermik cho‘qqilar aniqlandi. Tivitdan olingan KMX pH 5,0 da izoelektrik nuqtaga ega bo‘lgan aniq amfoter xususiyatlarga ega. Termik barqarorlik burg‘ulash eritmalarida (150 °C gacha) va biotibbiyot materiallarida qo‘llash uchun yetarli. Natijalar KMX ni pH-sezgir va termik chidamli polimer sifatida ishlatishni asoslaydi.
Adabiyotlar ro‘yxati
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