Sustainable, Tree-Free, PLA Coated, Biodegradable, Barrier Papers from Kendir (Turkish Hemp)

ABSTRACT

In this study, hemp-based barrier papers were produced by a facile film coating route. The hemp plant was mechanically separated by crushing and breaking down the stalks. The woody hurd and fibers were separated manually. Then, cellulosic pulp was prepared by the Kraft method. Alkali treated hemp fibers were used for the paper preparation, and papers were coated with poly(lactic acid) (PLA) films. Physical, morphological, structural, wetting, mechanical properties, thermal dimensional stability, and water vapor permeability (WVP) properties were analyzed. Average hemp fiber diameter decreased by around 50% after alkali treatment. It was also found that dry and wet tensile strength values for PLA-coated hemp papers increased 3- and 2-orders of magnitudes, respectively. Also, PLA-coated hemp papers showed 0% shrinkage in the temperature range from 100°C to 200°C. WVP of PLA-coated hemp papers decreased by around 50% compared to hemp paper at the end of 300 h.

Graphical abstract

摘要

在这项研究中, 大麻基阻隔纸是通过一种简便的薄膜涂层方法生产的. 大麻植物是通过压碎和分解茎秆来机械分离的. 人工分离木质赫德和纤维. 然后, 采用硫酸盐法制备纤维素纸浆. 使用碱处理的大麻纤维制备纸张, 并在纸张上涂覆聚乳酸 (PLA) 薄膜. 分析了物理, 形态, 结构, 润湿性, 机械性能, 热尺寸稳定性和水蒸气渗透性 (WVP) 性能. 碱处理后, 大麻纤维的平均直径下降了50%左右. 还发现, PLA涂层大麻纸的干拉伸强度值和湿拉伸强度值分别增加了3个数量级和2个数量级. 此外, PLA涂层的大麻纸在100至200°C的温度范围内显示出0%的收缩率. 在300小时结束时, PLA涂层大麻纸的WVP比大麻纸降低约50%.

KEYWORDS:

• Hemp
• Turkish hemp
• kendir
• hemp paper
• biodegradable barrier paper
• PLA

关键词:

• 大麻
• 土耳其大麻
• 肯迪尔
• 大麻纸
• 可生物降解隔离纸

List of abbreviations

Table

Highlights

• Hemp paper was produced by using Turkish hemp (Kendir).

• PLA film was coated on hemp paper to improve barrier properties.

• The interfacial contact between hemp paper and PLA film was enhanced by hot pressing.

• The coated paper showed good mechanical and barrier performance

• Barrier paper exhibited superior thermal stability.

Acknowledgments

This study was supported by The Scientific and Technological Research Council of Turkey (TUBITAK), 2209-A University Students Projects Support Program 2020/2 and Yalova University Central Research Laboratory.

Disclosure statement

No potential conflict of interest was reported by the authors.

Supplementary material

Supplemental data for this article can be accessed online at https://doi.org/10.1080/15440478.2022.2107140

Additional information

Funding

This work was supported by the The Scientific and Technological Research Council of Turkey (TUBITAK) [1919B012005087].