POLIETILENTEREFTALAT CHIQINDILARINING (ULTRABINAFSHA NURLAR TA’SIRIDA) DEGRADATSIYASIGA UCHRASHINI TADQIQ ETISH
DOI:
https://doi.org/10.5281/zenodo.19628918Kalit so‘zlar:
turli rangli ikkilamchi polietilen tereftalat namunalari, UV nurlanish apparati, infraqizil (IQ) spektroskopiya tahlili, differensial skanerlash kalorimetriyasi, molekulyar xususiyatlari, kristallanish darajasiAbstrak
Polietilen tereftalatning alkogolsiz ichimliklar va moyli qadoqlash ishlab chiqarishda keng qo'llanilishi poligonlarda ko'p miqdorda chiqindilar to'planishiga olib keladi. Poligonlarda chiqindilar quyosh nuri, issiqlik va turli xil agressiv muhitlarga duchor bo'ladi. Markaziy Osiyo sharoitida ulardan eng zararlisi yuqori quyosh nurlanishi bo'lib, u foto va fotooksidlovchi parchalanishni kuchaytiradi. Ushbu tadqiqotda Markaziy Osiyo ultrabinafsha (UB) nurlanishining ikkilamchi PET (IPET) ga qanday ta'sir qilishi o‘rganilgan. Iste'moldan keyingi PET chiqindilari yarim yilgacha tabiiy quyosh nuri va tezlashtirilgan ultrabinafsha nurlanishiga uchragan. IPET namunalarining tuzilishi va termokimyoviy tahlili o'rganildi. Fotooksidlovchi parchalanishga eng chidamlisi bo'yalmagan (shaffof) IPET ekanligi aniqlandi. Yarim yil ichida uning o'rtacha molekulyar og'irligi 8,8% ga kamaydi. Shuningdek, boshqa rangdagi pigmentlarni o'z ichiga olgan IPET ning parchalanish tezligi ham pasayganligi aniqlandi. Taqdim etilgan ma'lumotlar shuni ko'rsatadiki, ushbu degradatsiya davrida eng yuqori parchalanish darajasi jigarrang namunalar ishlab chiqarish uchun ishlatiladigan IPETda kuzatilgan - 36%. Ko'rinishidan, parchalanish chuqurligiga IPET ning dastlabki molekulyar og'irligi ham ta'sir qiladi. Bundan tashqari, IPET tarkibida bo'yoqlar mavjudligini inkor etib bo'lmaydi. To'q jigarrang pigment ultrabinafsha nurlarining to'liq yutilishiga hissa qo'shadi, bu esa chuqurroq yo'q qilinishiga olib keladi (36%).
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