Zhe Wang,Xiaoping Shen,Temeng Qian,Kang Xu,Qingfeng Sun,Chunde Jin
The hydrophilicity and flammability of fiberboards have limited their real-life applications. In this study, a facile strategy for preparing the multifunctional coatings with superhydrophobicity and flame retardancy on medium density fiberboards (MDFs) has been investigated. The superhydrophobic and flame-retardant coating on the MDF surface was obtained by depositing polydimethylsiloxane (PDMS) and 1H, 1H, 2H, 2H-perfluorodecyltrichlorosilane (FDTS)-modified Mg/Al layered double hydroxide (LDH) particles step by step. The as-prepared coating exhibited superhydrophobic properties with a water contact angle (WCA) of ~155° and good self-cleaning properties. Furthermore, the limiting oxygen index (LOI) value of the superhydrophobic MDFs increased by 60.4% as compared to that of the pristine MDFs, showing improved flame retardancy. The peak heat release rate (PHRR) and total heat release (THR) of MDFs decreased after coating with PDMS@FDTS-Mg/Al LDH, suggesting that the superhydrophobic coating decreased the fire growth speed and risk of fire hazard of MDFs. This coating with multiple functions opens a new avenue for the protection and functionalization of MDFs.Keywords:medium density fiberboard;Mg/Al LDH;FDTS;superhydrophobicity;flame retardancy
Xiaolan Zhang,Chuanlong Jia,Xiuying Qiao,Tianyi Liu,Kang Sun
Poly (glycerol sebacate) (PGS) elastomer scaffolds with different porosity for skin tissue engineering were fabricated via particulate leaching. The introduction of pores lowers the hydrophilicity but improves the water uptake capability of PGS. The gel content of PGS increases with the increase of salt mass ratio, but the degree of swelling goes the opposite way due to the existence of the porous structure. The degradation rate of PGS can be tailored and controlled by the porous structure, which is of great value for its applications in tissue engineering. The feasibility of these porous PGS scaffolds for skin tissue engineering was evaluated by seeding mouse dermal fibroblasts (MDFs) onto the scaffold. In vitro cell culture results indicate good attachment, proliferation and deep penetration of MDFs into porous PGS scaffolds, which confirms the excellent biocompatibility of these scaffolds.
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