PEMM/COPPE, Universidade Federal do Rio de Janeiro, PO Box 21945-970 Rio de Janeiro, RJ, Brazil.
Carbohydr Polym. 2013 Jan 16;91(2):675-81. doi: 10.1016/j.carbpol.2012.08.031. Epub 2012 Aug 18.
The development of thermoplastic materials based on starch has become a promising alternative for reducing plastic waste. To this end, plasma treatments were used to enhance the hydrophobicity of cornstarch films. Cornstarch films plasticized using glycerol and distilled water were prepared by casting. A surface modification method was employed using different precursor gases, HMDSO and SF(6), and a combined treatment using HMDSO followed by SF(6) (HMDSO/SF(6)) and then the reverse, using SF(6) first followed by HMDSO (SF(6)/HMDSO). The results indicated that the induced surface morphology determines the contact angle. It was observed that all films became hydrophobic, and films that were initially treated with SF(6) showed the greatest hydrophobicity if no further coating was applied, or if the treated surface was further coated using HMDSO. Under both of these treatment conditions the contact angle was greater than 110°.
基于淀粉的热塑性材料的发展已成为减少塑料废物的一种有前途的替代方法。为此，使用等离子体处理来提高玉米淀粉薄膜的疏水性。使用甘油和蒸馏水增塑的玉米淀粉薄膜通过铸造制备。使用不同的前体气体六甲基二硅氮烷 (HMDSO) 和六氟化硫 (SF(6)) 采用表面改性方法，以及使用 HMDSO 预处理然后用 SF(6) 处理 (HMDSO/SF(6)) 和反过来，先用 SF(6) 预处理然后用 HMDSO 处理 (SF(6)/HMDSO)。结果表明，诱导的表面形态决定了接触角。观察到所有薄膜都变得疏水，如果不进一步涂覆，或者如果用 HMDSO 进一步涂覆处理过的表面，则最初用 SF(6) 处理的薄膜表现出最大的疏水性。在这两种处理条件下，接触角都大于 110°。
