Agricultural production is facing escalating heat problems due to global warming, with crops that thrive in hotter conditions at particular risk. Traditional agricultural films, while effective at insulating heat, lack inherent heat dissipation properties and typically require manual or mechanical intervention for temperature regulation, inevitably augmenting the economic costs associated with farming. In this work, the transparent agricultural films with heat dissipation function, which is prepared by solution blending and electrostatic spinning technology from polyvinylidene fluoride (PVDF) and cellulose acetate (CA) for the agricultural mulch films. The results of scanning electron microscopy (SEM) and transparency tests showed that at a mass ratio of PVDF to CA of 3:1, a clear fiber interlacing network was observed at the microscopic level and excellent transparency was presented at the macroscopic level. When the intensity of sunlight reaches 600 W/cm², the internal temperature of the M_3.1-PVDF/CA-E is 6.5 ℃ lower than that of the polyethylene films, effectively reducing the internal temperature. At the seed germination stage, not only was the germination rate of Chinese cabbage seeds covered with M_3.1-PVDF/CA-E material significantly higher than that of polyethylene films, but its overall growth parameters were also more favorable. In comparison to the polyethylene films, Chinese cabbage covered with M_3.1-PVDF/CA-E shows different degrees of advantages in terms of number of leaves, plant height, fresh weight per plant, fresh weight of above-ground portion, and dry weight of above-ground portion at the time of harvesting. This work offered a novel strategy for fabricated transparent agricultural films with heat dissipation properties and soil moisture retention for agricultural mulch application.

中文翻译：

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用于农业覆盖应用的透明醋酸纤维素/聚偏二氟乙烯薄膜，具有散热功能


由于全球变暖，农业生产正面临不断升级的高温问题，在炎热条件下茁壮成长的作物尤其面临风险。传统的农用薄膜虽然能有效地隔热，但缺乏固有的散热性能，通常需要人工或机械干预进行温度调节，这不可避免地增加了与农业相关的经济成本。在本工作中，通过聚偏二氟乙烯 （PVDF） 和醋酸纤维素 （CA） 的溶液共混和静电纺丝技术制备了具有散热功能的透明农用薄膜，用于农用地膜。扫描电子显微镜 （SEM） 和透明度测试结果表明，当 PVDF 与 CA 的质量比为 3：1 时，在微观水平上观察到清晰的纤维交织网络，在宏观水平上表现出优异的透明度。当太阳光强度达到 600 W/cm² 时，M_3.1-PVDF/CA-E 的内部温度比聚乙烯薄膜低 6.5 °C，有效降低了内部温度。在种子发芽期，覆盖M_3.1-PVDF/CA-E材料的大白菜种子不仅发芽率显著高于聚乙烯薄膜，而且其整体生长参数也更有利。与聚乙烯薄膜相比，用 M_3.1-PVDF/CA-E 覆盖的白菜在收获时在叶数、株高、单株鲜重、地上部分鲜重和地上部分干重方面表现出不同程度的优势。 这项工作为制备具有散热性能和土壤保湿性的透明农用薄膜提供了一种新的策略，用于农业地膜应用。