Effect of nitrocellulose on the properties of PU-NC Semi-IPNs wood coatings

in English journal, 英文期刊
標題Effect of nitrocellulose on the properties of PU-NC Semi-IPNs wood coatings
出版類型英文期刊(EI)
出版年度2003
AuthorsHong-Lin Lee, 李鴻麟
期刊Journal of Applied Polymer Science
開始頁2157
頁數5
出版日期2003 / 11
其他編號0000
中文摘要

Wood coatings of PU–NC semi-interpenetrating polymer networks (semi-IPNs), made from blown castor oil (BCO), aromatic polyisocyanate (PTDI), and nitrocellulose
(NC) , were prepared by sequential polymerization method. To investigate the effects of NC on the properties of PU–NC semi-IPNs wood coatings, three different viscosities of NC (12-sec, 14-sec, and 116-sec), and a PU catalyst [dibutyltin
dilaurate (DBTDL)] were synthesized in this study. The results revealed that the PU–NC semi-IPNs with 12-sec NCcontaining coating had the shortest drying time, and their films had the best tensile strength, elongation at break, lightfastness, and solvent resistance. Dynamic mechanical analysis showed that PU–NC semi-IPNs with 12-sec NC or 116-sec NC had good interpenetration between PU and NC, whereas PU–NC semi-IPNs with 14-sec NC had a slight separation phase between PU and NC. In both PU–NC semi-IPNs with 14-sec NC and those with 116-sec NC, the addition of 0.2% DBTDL could effectively reduce the drying time of the coating and improve the film properties, including tensile strength, elongation at break, and lightfastness. In addition, the miscibility of PU and NC was examined in PU–NC semi-IPNs with 14-sec NC.

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