M.Sc. Tezi Görüntüleme | |||||||||||||||||||||
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| Summary: The fibrillated celluloses scales were produced and used as additive for papermaking industry. Anionic nano and microfibrillated celluloses (ANFC and AMFC) were produced by TEMPO/NaBr/NaCIOpre-treatment of cellulosic fibres followed by mechanical disintegration. When high pressure homogeniser was used for disintegration the size of fibrillated celluloses decreased to nano scale. However, size of fibrillated cellulose decreased to micron scales with using ultraturrax giving less mechanical shearing effect compared high pressure homogeniser. The cationic nanofibrillated cellulose (CNFC) was consecutive pre-treatments of mechanical beating with PFI, enzyme, and cationic modification with glycidyltrimethylammonium chloride followed by passing through high pressure homogeniser. The tensile index of papers significantly increased when CNFC and ANFC were added to fibre suspension before making papers. The adsorption properties of nanofibrilated cellulose on SiO2 crystal surface and starch based complexes on both cellulose model surface and bare SiO2 crystal surface were studied by using Quartz Crystal Micro-balance with Dissipation (QCM-D). Results showed that adsorbed amount of CNFC on crystal surface was higher compared that of ANFC on CNFC layer. This is mostly due to lower charge density and bigger size of CNFC. Additionally, higher amount of starch complexes were adsorbed model cellulose surface indicating that surface topography was important as well as properties of complexes. Keywords:nanofibrillatedcellulose, microfibrilatedcellulose, stregthproperties of paper, QCM-D, adsorption
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