Winotapun Charinee, Tameesrisuk Methinee, Sirirutbunkajal Pakjira, Sungdech Pichamon, Leelaphiwat Pattarin
National Metal and Materials Technology Center, National Science and Technology Development Agency, Thailand Science Park, Pathum Thani 12120, Thailand.
Department of Packaging and Materials Technology, Faculty of Agro-Industry, Kasetsart University, Bangkok 10900, Thailand.
ACS Omega. 2024 Jan 9;9(3):3469-3479. doi: 10.1021/acsomega.3c06999. eCollection 2024 Jan 23.
This study focused on improving the mechanical properties of the poly(butylene succinate) (PBS) film by incorporation of poly(butyrate adipate terephthalate) (PBAT). At 20 wt % PBAT, elongation in the transverse direction improved by 373% while maintaining high tensile strength (27 MPa) and Young's modulus (262 MPa). The PBS80/PBAT20 composite film exhibited optimized mechanical properties. The absorbance coefficient of microperforated film at 980/cm for the 80PBS/20PBAT mix, corresponding to the 10.2 μm CO laser wavelength, was 65/cm, indicating high film capability to absorb energy from the CO laser. The introduction of microholes enhanced the gas permeability of the PBS/PBAT film. As fluences increased from 187 to 370 J/cm, there was a notable increase in microhole area in 80PBS/20PBAT film from 19,375 to 46,421 μm. Concurrently, the gas transmission rate for a singular hole increased from 45 to 210 cm/d for the oxygen transmission rate (OTR) and from 115 to 220 cm/d for the CO transmission rate (COTR). For mango packed in microperforated 80PBS/20PBAT films, the O levels inside the package gradually dropped and remained at 14.2% in PBS80/PBAT20-MP1 (OTR ∼ 68,900 cm/m·d) and 16.7% in PBS80/PBAT20-MP2 (OTR ∼ 131,900 cm/m·d), while CO content increased to 6% for PBS80/PBAT20-MP1 and 4% for PBS80/PBAT20-MP2 throughout 33 days. On day 2 of storage in the nonperforated package, O content dropped to 2% while CO content rose to 22%. Mango packed in the 80PBS/20PBAT film package exhibited an unsatisfactory freshness quality due to the detection of a fermentative odor on day 5 of the storage period. Total soluble solids, color, and weight loss of mango remained stable during storage in all microperforated films. Results demonstrated that the mango shelf life was significantly extended by 35 days using 80PBS/20PBAT-MP1. Laser perforation offered a practical method for improving gas transmission rates (OTR and COTR) of 80PBS/20PBAT film for mango packaging.
本研究聚焦于通过掺入聚（己二酸丁二醇酯对苯二甲酸丁二醇酯）（PBAT）来改善聚丁二酸丁二醇酯（PBS）薄膜的机械性能。在PBAT含量为20 wt%时，横向伸长率提高了373%，同时保持了较高的拉伸强度（27 MPa）和杨氏模量（262 MPa）。PBS80/PBAT20复合薄膜展现出优化的机械性能。对于80PBS/20PBAT混合物的微孔薄膜，在980/cm处对应10.2μm CO激光波长的吸收系数为65/cm，表明该薄膜具有从CO激光吸收能量的高能力。微孔的引入提高了PBS/PBAT薄膜的透气性。随着能量密度从187 J/cm增加到370 J/cm，80PBS/20PBAT薄膜中的微孔面积从19375μm显著增加到46421μm。同时，单个孔的气体透过率对于氧气透过率（OTR）从45 cm³/d增加到210 cm³/d，对于二氧化碳透过率（COTR）从115 cm³/d增加到220 cm³/d。对于包装在微孔80PBS/20PBAT薄膜中的芒果，包装内的氧气水平逐渐下降，在PBS80/PBAT20 - MP1（OTR ∼ 68900 cm³/m·d）中保持在14.2%，在PBS80/PBAT20 - MP2（OTR ∼ 131900 cm³/m·d）中保持在16.7%，而二氧化碳含量在33天内对于PBS80/PBAT20 - MP1增加到6%，对于PBS80/PBAT20 - MP2增加到4%。在非穿孔包装中储存的第2天，氧气含量降至2%，而二氧化碳含量升至22%。包装在80PBS/20PBAT薄膜包装中的芒果在储存期第5天检测到发酵气味，新鲜度质量不佳。在所有微孔薄膜中储存期间，芒果的总可溶性固形物、颜色和重量损失保持稳定。结果表明，使用80PBS/20PBAT - MP1可使芒果货架期显著延长35天。激光打孔为提高用于芒果包装的80PBS/20PBAT薄膜的气体透过率（OTR和COTR）提供了一种实用方法。
