1. Enhancing moisture resistance of starch-coated paper by improving the film forming capability of starch film
- Author
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Zhiqiang Fang, Kuang Qitong, Donghan Lin, Chengcheng Wang, Congxin Peng, Yudi Kuang, Penghui Zhu, and Gang Chen
- Subjects
Coated paper ,Materials science ,Moisture ,Starch ,02 engineering and technology ,engineering.material ,010402 general chemistry ,021001 nanoscience & nanotechnology ,01 natural sciences ,Polyvinyl alcohol ,0104 chemical sciences ,chemistry.chemical_compound ,chemistry ,Coating ,Polymer chemistry ,Ultimate tensile strength ,engineering ,Glyoxal ,Composite material ,0210 nano-technology ,Porosity ,Agronomy and Crop Science - Abstract
Starch-coated paper is widely used in packaging, printing, writing, and so on. However, achieving starch-coated paper with excellent moisture resistance remains a challenge for its end uses. To overcome this challenge, we hypothesize that the film-forming ability of starch plays a pivotal role in the moisture resistance of starch-coated paper. Polyvinyl alcohol (PVA) is used to enhance the film-forming capability of starch film and the moisture resistance of PVA/CS coated paper is evaluated in terms of moisture absorption, tensile index, and stiffness. A PVA/CS film with only a coating weight of 4.0 g/m2 can fully cover the porous structure of paper that leads to a higher moisture resistance than CS-coated paper with a similar loading weight. However, as the coating weight continues to increase, the decline of the mechanical properties of PVA/CS coated paper is almost unchanged. Furthermore, the moisture resistance of PVA/CS coated paper (coating weight is larger than 4.0 g/m2) is further improved by using glyoxal as moisture proof agent (MPA). Only 4.8% and 6.3% losses in the tensile index and stiffness at a coating weight of 4.0 g/m2 are achieved before and after moisture treatment, respectively. These results may shed light on exploring new method to enhance moisture resistance of starch-coated paper.
- Published
- 2017