PLA, abu ne mai iya lalacewa, polymer Semi-crystalline ne tare da narkewar zafin jiki har zuwa 180 ℃.Don haka me yasa kayan ke da mummunan juriya na zafi da zarar an yi shi?
Babban dalilin shi ne cewa crystallization kudi na PLA ne jinkirin da crystallinity na samfurin ne low a kan aiwatar da talakawa aiki da gyare-gyare.Dangane da tsarin sinadarai, sarkar kwayoyin halitta ta PLA ta ƙunshi -CH3 akan atom ɗin carbon na chiral, wanda ke da tsarin tsarin helical na al'ada da ƙarancin aiki na sassan sarkar.Ƙarfin crystallization na kayan polymer yana da alaƙa da alaƙa da ayyukan sarkar kwayoyin halitta da ƙarfin nucleation.A cikin sanyaya tsari na talakawa aiki gyare-gyaren, da zazzabi taga dace da crystallization ne sosai kananan, sabõda haka, crystallinity na karshe samfurin ne kananan da thermal nakasawa zafin jiki ne low.
Gyaran nucleation hanya ce mai tasiri don haɓaka kristal na PLA, haɓaka ƙimar crystallization, haɓaka kayan ƙira kuma don haka ƙara ƙarfin juriya na PLA.Sabili da haka, gyare-gyare na kayan PLA irin su nucleation, maganin zafi da crosslinking yana da muhimmiyar rawa wajen faɗaɗa kewayon aikace-aikacen samfuran PLA ta hanyar haɓaka yanayin yanayin zafi da haɓaka yanayin zafi.
Abubuwan da ke haifar da nuclein sun kasu kashi-kashi zuwa inorganic nucleating agents da kwayoyin halitta.Inorganic nucleating jamiái yafi hada da phyllosilicates, hydroxyapatite da abubuwan da aka samo asali, carbon kayan da sauran inorganic nanoparticles.Clay wani nau'i ne na kayan ma'adinai na silicate wanda aka saba amfani da shi a gyaran PLA, daga cikinsu montmorillonite shine mafi wakilci.Babban magungunan nucleating kwayoyin halitta sune: mahadi amide, bisylhydrazides da biureas, ƙananan ƙwayoyin biomass, organometallic phosphorus / phosphonate da polyhedral oligosiloxy.
Ƙarin hadaddun ƙwayoyin nucleating don inganta yanayin yanayin zafi ya fi na ƙari guda ɗaya.Babban nau'i na lalacewa na PLA shine hydrolysis bayan hygroscopic, don haka ana iya amfani da hanyar narke blending, ƙara hydrophobic additive dimethylsilicone man don rage hygroscopic dukiya, ƙara alkaline Additives don rage lalata kudi na PLA ta canza PH darajar na PLA.
Lokacin aikawa: Nuwamba-07-2022