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Barrier Properties of Polylactic Acid in Cellulose Based Packages Using Montmorillonite as Filler

机译:以蒙脱土为填充剂的纤维素基包装中聚乳酸的阻隔性能

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Polylactic acid (PLA) and montmorillonite (CB) as filler were studied as coatings for cellulose based packages. Amorphous (AM) and semi crystalline (SC) PLA were used at different concentrations according to a 2 × 6 × 3 full factorial experimental design. CB loading was three concentrations and coating was performed by casting. Contact angle (CA), water vapor (WVP) and grease permeabilities were measured for each resultant package and were compared to commercial materials (Glassine Paper, Grease Proof Papers 1 and 2 produced commercially). Significant differences were found and the main factors were the type and concentration of PLA. The best values were: for grease penetration, +1800 s; WVP from 161.36 to 237.8 g·µm·kPa−1·m−2·d−1 and CA from 69° to 73° for PLA–AM 0.5% and CB variable. These parameters are comparable to commercial packages used in the food industry. DSC revealed three different thermal events for PLA–SC and just Tg for PLA–AM. Crystallinity was also verified, obtaining a ΔHcrys of 3.7 J·g−1 for PLA–SC and 14 J·g−1 for PLA–SC–BC, evidencing clay interaction as a crystal nucleating agent. Differences found were explained on terms of the properties measured, where structural and chemical arrays of the coatings play a fundamental role for the barrier properties.
机译:研究了聚乳酸(PLA)和蒙脱石(CB)作为填充剂,用于纤维素包装的涂料。根据2×6×3全因子实验设计,使用了不同浓度的非晶(AM)和半结晶(SC)PLA。 CB的装载量为三种浓度,并且通过流延进行涂覆。测量每个所得包装的接触角(CA),水蒸气(WVP)和油脂渗透率,并将其与商业材料(玻璃纸,商业生产的防油纸1和2)进行比较。发现差异显着,主要因素是PLA的类型和浓度。最佳值是:对于油脂渗透,+ 1800 s; WVP从161.36至237.8 g·µm·kPa −1 ·m -2 ·d -1 ,CA从69°至73° PLA–AM 0.5%和CB变量。这些参数与食品工业中使用的商业包装相当。 DSC揭示了PLA-SC的三种不同的热事件,而PLA-AM的仅为T g 。结晶度也得到了验证,PLA–SC的ΔH为3.7 J·g -1 ,PLA为14 J·g -1 –SC–BC,证明粘土相互作用是晶体成核剂。发现的差异是根据测得的性能进行解释的,其中涂层的结构和化学排列对阻隔性能起着根本性的作用。

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