Background. Cellulose acetate yog thawj zaug npaj los ntawm Paul Schützenberger hauv xyoo 1865. Nws siv sijhawm 29 xyoo ua ntej Charles Cross thiab Edward Bevan patented txheej txheem rau nws siv.
Leej twg nrhiav tau cellulose acetate?
Lub xyoo 2006 yog hnub tseem ceeb ntawm kev tshawb pom ntawm cellulose acetate (CA) electrophoresis los ntawm Joachim Kohn, tus kws kho mob ntawm Queen Mary's Tsev Kho Mob hauv Roehampton, London. Thaum lub sijhawm ua haujlwm hauv pathology uas tau pib xyoo 1950 thiab ncua 37 xyoo, Kohn tau luam tawm ntau dua 50 cov ntaub ntawv hauv chaw kuaj mob tshuaj.
cellulose triacetate ua li cas?
Cellulose acetate feem ntau yog tsim los ntawm ntoo pulp los ntawm kev cuam tshuam nrog acetic acid thiab acetic anhydride nyob rau hauv lub xub ntiag ntawm sulfuric acid los tsim cellulose triacetate. Lub triacetate yog ib nrab hydrolyzed rau qhov xav tau kev hloov pauv.
Triacetate cellulose yog dab tsi?
Cellulose triacetate yog cov khoom yas tsim los ntawm cellulose. Cov pawg hydroxyl ntawm cellulose yog tshuaj hloov pauv rau pawg carboxyl. Yog li ntawd, nws cov yam ntxwv txawv heev ntawm cellulose. Lub cellulose triacetate membrane muaj ib homogeneous membrane qauv.
Thaum twg yog cellulose zaj duab xis tsim?
Cellulose nitrate raws li cov yeeb yaj kiab tau tsim tawm thaum ntxov 20th xyoo pua txog xyoo 1952. Lawv tau tsim los hloov iav phajnegatives, thiab siv rau cov duab dub thiab dawb. Nitrate raws li cov yeeb yaj kiab yog qhov tsis ruaj khov thiab yuav tsis zoo nyob rau hauv qhov kub ntawm 70 ° F thiab cov av noo ntau dua 50%.
