Please use this identifier to cite or link to this item: http://repository.aaup.edu/jspui/handle/123456789/1356
Title: Carboxymethylated Pulp as starting point tp prepare Hydroxylpropyl methyl Cellulose with enhanced Gel Rheological Properties in aquous Medium
Authors: Qrareya, Hisham$AAUP$Palestinian
Hamed, Othman $Other$Palestinian
Deghlas, Abdalhadi $Other$Palestinian
Al -kerm, Rola $Other$Palestinian
Al-Kerm, Rana $Other$Palestinian
Dagdag, Omar $Other$Other
Keywords: carboxymethylatedpulp
Hydroxypropyl methylcellulose
Issue Date: 4-Jan-2021
Publisher: Bioresources. Com
Citation: Bio resources.com
Abstract: Hydroxypropyl methylcellulosein an aqueous solution upon heating tendsto undergo thermalgelation, where thepolymer chains form a network and precipitatefrom solution. This occurs at a temperature known asthermal gelationpoint. Polymer precipitationcauses a significant drop in the shear viscosity. This could be a disadvantage in a hot environment or in applications were heat is applied. In this work, a hydroxypropylmethyl cellulose (HPMC)was formed that undergoes thermal gelationwith no polymer precipitationand with enhanced rheological properties. The target HPMC was prepared from wood pulp withalow content of carboxymethyl groups. The produced hydroxypropyl methylcellulose(CMHPMC)derivativeshowed uniquephysical properties that are not achievable with typical hydroxypropyl methylcellulose.The thermal gelation temperature of an aqueous solution of CMHPMC wasincreasedfrom 55 °C for commercial HPMC to 85 °C forCMHPMC. Asubstitution level of carboxymethylationthat led to an HPMC witha thermal gelation and with no precipitationwas determined to bea 0.15of carboxyl groupsper anhydroglucose repeat unit.In addition, the carboxymethylatedpulp showed an enhanced reactivity towards etherification reactions.
URI: http://repository.aaup.edu/jspui/handle/123456789/1356
Appears in Collections:Faculty & Staff Scientific Research publications

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