4.7 Article

Composite films obtained from a waterborne biopolyurethane. Incorporation of tartaric acid and nanocellulose

期刊

INDUSTRIAL CROPS AND PRODUCTS
卷 142, 期 -, 页码 -

出版社

ELSEVIER
DOI: 10.1016/j.indcrop.2019.111879

关键词

Bio-based waterborne polyurethane; Tartaric acid; Cellulose nanocrystals

资金

  1. ANPCyT [PICT 2016-2034]
  2. UNMdP [15/G494/ING500/17]
  3. CONICET

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Unmodified castor oil (CO) and tartaric acid (TA), a dihydroxy acid that can be obtained from various by-products of the grape processing to wine, were used in order to obtain bio-based waterborne polyurethanes (WBPUs). Isophorone diisocyanate (IPDI) was incorporated to the formulation to obtain transparent films. The effect of the incorporation of polycaprolactone diol (PCL), a biodegradable diol was investigated in order to increase the flexibility of the WBPU. Additionally, cellulose nanocrystals (CNC) were used as bio-reinforcement for these polyurethanes (thus, increasing the use of bio resources). The final neat and composite material films were characterized by ATR-FTIR, XRD, DMA and TGA. The addition of PCL in the polyurethane formulation was confirmed by FTIR and led to the decrease of the T-g of the films, thus to a more flexible material. CNC addition resulted in an increase of the storage modulus of the material, at all the temperatures tested. CNCs interact and generate a three-dimensional network of the reinforcement ( > 2 wt.%), improving the ability of the films to maintain structural integrity when they were immersed in water.

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