期刊
POLYMERS
卷 14, 期 16, 页码 -出版社
MDPI
DOI: 10.3390/polym14163309
关键词
calcium carbonate; cationic cellulose; fibrillated cellulose; flocculation; laser diffraction spectrometry; quaternary ammonium
资金
- Portugal 2020 through European Regional Development Fund (ERDF) [21874, 246/AXIS II/2017]
- Fundacao para a Ciencia e Tecnologia (FCT) [UIDB/00102/2020]
- Foundation for Science and Technology, Portugal [PTDC/SAU-PUB/32587/2017]
- [BDE 05\POCI-01-0247-FEDER-021874]
- Fundação para a Ciência e a Tecnologia [PTDC/SAU-PUB/32587/2017] Funding Source: FCT
Cationic cellulose derivatives synthesized through cationization treatment of pulp showed potential as bio-based retention agents in papermaking formulations, as evidenced by their flocculation performance and capability to improve filler retention.
Cationic polyacrylamides (CPAMs) are usually used as filler retention agents in papermaking formulations. However, increasing environmental restrictions and their non-renewable origin have driven research into bio-based alternatives. In this context, cationic lignocellulosic derivatives have been attracting considerable research interest as a potential substitute. In this work, distinct cationic celluloses with degrees of substitution of between 0.02 and 1.06 and with distinct morphological properties were synthesized via the cationization of bleached eucalyptus kraft pulp, using a direct cationization with (3-chloro-2-hydroxypropyl) trimethylammonium chloride (CHPTAC) or a two-step cationization, where the cellulose was first oxidized to form dialdehyde cellulose and was then made to react with Girard's reagent T (GT). Fibrillated samples were produced by subjecting some samples to a high-pressure homogenization treatment. The obtained samples were evaluated regarding their potential to flocculate and retain precipitated calcium carbonate (PCC), and their performance was compared to that of a commercial CPAM. The cationic fibrillated celluloses, with a degree of substitution of ca. 0.13-0.16, exhibited the highest flocculation performance of all the cationic celluloses and were able to increase the filler retention from 43% (with no retention agent) to ca. 61-62% (with the addition of 20 mg/g of PCC). Although it was not possible to achieve the performance of CPAM (filler retention of 73% with an addition of 1 mg/g of PCC), the results demonstrated the potential of cationic cellulose derivatives for use as bio-based retention agents.
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