Functional surface coatings from tailor-made long-chain hydroxypropyl cellulose ester nanoparticles
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Hydroxypropyl cellulose (HPC)-esters were prepared by a homogeneous reaction of HPC with fatty acid chlorides. The effects of different solvent systems and reaction additives were evaluated, and plain, dried THF was established as best system in terms of toxicity, targeted synthesis of desired degree of substitution (DS), chain degradation and ease of workup. Moreover, pyridine/4-dimethylaminopyridine (4-DMAP) was found to be the fastest system overall. The reaction kinetics with different fatty acids—lauric, myristic, palmitic and stearic acid—were characterized and comprehensively compared. The DS could be adjusted precisely, giving control over the glass transition temperature (Tg)/melting point (Tm) of the HPC-esters, yielding a toolbox to tailor HPC-ester. In a next step, nanoparticles are formed from HPC stearic acid ester and used to generate superhydrophobic surface coatings, thereby demonstrating one of the interesting potential uses of this sustainable material.
KeywordsHydroxypropyl cellulose Sustainable thermoplastics Bio based polymer Kinetic investigation Surface coating
The authors would like to thank Martina Ewald and Heike Herbert for technical support and GPC measurements. Furthermore, we would like to thank Christian Rüttiger for conducting DSC measurements, and we would like to thank Dr. A. Geissler for valuable scientific discussions. This work was funded in part by the DFG Collaborative Research Center 1194 (SFB1194 “Wechelseitige Beeinflussung von Transport- und Benetzungsvorgängen”).
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Conflict of interest
The authors declare no conflict of interest.
- Chen WW, Weng WG, Fu M (2017) Hydroxypropyl cellulose-based esters for thermal energy storage by grafting with palmitic-stearic binary acids. J Appl Polym Sci 134:44949Google Scholar
- Geissler A (2017) Charakterisierung und Applikation von Fettsäureestern der Cellulose und deren kolloidaler Systeme vol 10. Makromolekulare Chemie, 1. Auflage edn., AachenGoogle Scholar
- Heinze T, Glasser WG (1998) The role of novel solvents and solution complexes for the preparation of highly engineered cellulose derivatives. Cellul Deriv Am Chem Soc 688:2–18Google Scholar
- Meller A (1953) Studies on modified cellulose. 3. Characterization of the reactivity and supermolecular structure cellulose fibers. Tappi 36:264–267Google Scholar
- Wüstenberg T (2014) Hydroxypropylcellulose. In: Cellulose and cellulose derivatives in the food industry. Wiley, New York, pp 319–342Google Scholar
- Zhang ZG, Li GN, Hu GL, Sun YY (2013) Theoretical research on the mechanism of the dimerization reactions of alkyl ketene. J Chem 2013:481586Google Scholar