Abstract
A new kind of crosslinkable potato starch-based graft copolymer emulsion (PoSt-g-BMD) has been prepared using butyl acrylate (BA) and methyl methacrylate (MMA) as main monomers, and diacetone acrylamide (DAAM) as functional monomer. The keto-carbonyl group of DAAM in PoSt-g-BMD copolymer could react with adipic dihydrazide (ADH) at ambient temperature to form cross-linked copolymer. The PoSt-g-BMD had been characterized by the FT-IR spectra and thermogravimetric analysis (TGA). It was applied to prepare the humidity-controlling coatings (PoSt-g-BMD-C). The water absorption of PoSt-g-BMD-C was 105%. The humidity controlling properties were also measured, and the PoSt-g-BMD-C exhibited humidity sensitivity and humidity retention because fillers of porous structure combined with PoSt-g-BMD copolymer emulsion based on scanning electron microscopy images (SEM). It could be widely applied in indoor coating for controlling humidity.
Highlights
In order to achieve a healthy and comfortable indoor environment, it is very important to control humidity level
The keto-carbonyl group of diacetone acrylamide (DAAM) in potato starch (PoSt)-g-BMD copolymer could react with adipic dihydrazide (ADH) at ambient temperature to form cross-linked copolymer
The first goal was to prepare crosslinkable PoSt‐based graft copolymer (PoSt-g-BMD) that might serve as waterborne coatings, which can be cured at ambient temperature and possess good properties
Summary
In order to achieve a healthy and comfortable indoor environment, it is very important to control humidity level. The humidity-controlling coatings are one of the humiditycontrolling materials and are different from the conventional coatings They must have strong absorption and good water retention, which means faster response for water[4,5,6,7]. The properties of starch-based materials are often responsive to the changes of the environment humidity[9], temperature or pH10. Graft copolymerization on starch[18,19,20,21,22] gives the possibility to synthesize new highly added value materials for various applications, which were applied for the textiles, composites,. It was applied to prepare the humidity-controlling coatings (PoSt-g-BMD-C). The water absorption and humidity controlling function of the coatings were investigated, and the PoSt-g-BMD-C exhibited humidity sensitivity and humidity retention
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