Reported herein is the synthesis of biobased and sustainable chitosan-graft-castor oil (CHI-g-CO)copolymer that can be used for paper coating. CHI-g-CO was obtained via chemical grafting of castor oil-capped isocyanate (CO-capped-NCO) onto a chitosan polymer backbone. The CHI-g-CO copolymer was then employed as a waterborne coating for Kraft unbleached paper to render the coated paper both water- and oil-resistant. The formulation of the CHI-g-CO-coated paper was optimized by using the response surface methodology. The oil and water resistances of the coated paper substrates were determined via kit rating measurements and Cobb60 value tests, respectively. Water and oil contact angles were also determined for the coated paper. In addition, the water vapor permeability and mechanical properties of the coated paper were evaluated. Scanning electron microscopy (SEM) was also used to evaluate the effect of the coating on the microstructures and the porosity of the paper. Considering the biobased nature of the coating materials (e.g., chitosan and castor oil), this fabrication strategy can offer an environmental-friendly, sustainable, and economical approach toward water- and oil-resistant paper.

中文翻译：

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耐水和耐油纸的生物基和可持续涂料的响应面方法学设计

本文报道了可用于纸涂布的生物基且可持续的壳聚糖-接枝-蓖麻油（CHI - g -CO）共聚物的合成。通过将蓖麻油封端的异氰酸酯（CO封端的NCO）化学接枝到壳聚糖聚合物主链上可获得CHI- g -CO。然后将CHI- g -CO共聚物用作牛皮纸未漂白纸的水性涂料，以使该涂布纸既耐水又耐油。的罗致光的制剂克-CO涂布纸通过使用响应面方法进行了优化。分别通过试剂盒等级测量和Cobb60值测试确定涂布纸基材的耐油性和耐水性。还确定了涂布纸的水和油接触角。另外，评价了涂布纸的水蒸气透过率和机械性能。扫描电子显微镜（SEM）也用于评估涂层对纸张的微观结构和孔隙率的影响。考虑到涂层材料（例如，壳聚糖和蓖麻油）的生物基性质，这种制造策略可以为耐水和耐油纸提供一种环保，可持续和经济的方法。