agricultural films
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Crystals ◽  
2021 ◽  
Vol 11 (7) ◽  
pp. 826
Author(s):  
Runmeng Qiao ◽  
Xin Wang ◽  
Guangjiong Qin ◽  
Qi Liu ◽  
Jialei Liu ◽  
...  

White pollution caused by agricultural films has recently attracted great attention. In some areas, the content of micro plastic in the soil has reached 30 kg/ha. The most effective way to solve this problem is to replace traditional polyethylene agricultural films with degradable agricultural films. The consistency between the degradation rate and the crop growth period has become the biggest obstacle for the wide application of such novel agricultural films. In this paper, crystallinity regulation is used to adjust the functional period of degradable agricultural films. In addition, an organic nucleating agent of polyethylenimine (PEI) is selected by doping it to poly(butylene adipate-co-terephthalate) (PBAT) polymers using a double-screw extruder. The PBAT doped with 1 wt% PEI films revealed a significant increase in mechanical properties, water holding capacity, and crystallinity compared with the pure PBAT film. There was a 31.9% increase in tensile strength, a 30.5% increase in elongation at break, a 29.6% increase in tear resistance, a 30.9% decrease in water vapor permeability, and a 3.1% increase in crystallinity. Furthermore, the induction period of PBAT doped with 1 wt% PEI under photoaging (without soil) was about 160 h longer than PBAT film, and the experienced biodegradation in soil (without light) was 1 week longer than PBAT film. Experimental results exhibited that the change of degradation degree was linearly proportional to the degree of crystallinity. This study proposes a convenient, low-cost, and effective method to adjust the crystallinity and change the degradation rate.


2021 ◽  
Author(s):  
Yu Chen ◽  
Shuanghong Yang ◽  
Zhiwei Qiu ◽  
Yuqi Li ◽  
Fengxian Qiu ◽  
...  

Abstract In the view of sustainable development and environment protection, degradable agricultural films with on-demand thermal insulation properties have attracted growing research interest in the last few decades due to the deteriorating environment and extreme climate on the growth and existence of crops. Here, a general strategy has been developed to fabricate degradable silver nanowires modified cellulose (AgNWs/cellulose) hybrid film with controllable thermal insulation and antibacterial properties by using plant cellulose and AgNWs as building blocks, as well as their agriculture application. The results showed that the AgNWs were evenly dispersed in the three-dimensional grid of cellulose, formed a film that could withstand a certain tensile force, and have good thermal stability. Due to the excellent electrical conductivity, the AgNWs/cellulose hybrid films can provide excellent Joule heating, generating rapid thermal response and uniform electrical heating at a low supply voltage of 3 V for extra warmth. In the antibacterial tests against Escherichia coli and Staphylococcus aureus, the AgNWs/cellulose hybrid film exhibit large diameters of inhibition zones, revealing the high antibacterial activity. Additionally, the AgNWs/cellulose hybrid films showed highly stretchable behavior by delivering a breaking strain of 1.5% with a tensile stress of 0.45 MPa owing to the cross-linked structures of cellulose and AgNWs. Based on the above properties, this study not only provides a potential strategy for the fabrication of flexible and biodegradable agricultural films but also may provide new insights for agricultural thermal management.


Coatings ◽  
2021 ◽  
Vol 11 (2) ◽  
pp. 139
Author(s):  
Yuanping Jiang ◽  
Chunpei Yan ◽  
Han Zhang ◽  
Miaomiao Wu ◽  
Shaodi Zheng ◽  
...  

Rare earth luminescent material CaAlSiN3:Eu2+ (CEu) was applied and modified with (3-Aminopropyl) triethoxysilane (KH550) to obtain two types of rare earth conversion agents, CEu and KH550-modified CEu (KCEu). Two kinds of polylactide (PLA) conversion films were successfully prepared through solution blending. The results showed that the addition of rare earth complex increases the crystallinity of PLA. More importantly, both PLA/CEu and PLA/KCEu films showed good red-light conversion ability, which can accelerate plant growth.


Polymers ◽  
2020 ◽  
Vol 13 (1) ◽  
pp. 113
Author(s):  
Zhihui Zhang ◽  
Zhengdong Zhao ◽  
Yujia Lu ◽  
Di Wang ◽  
Chengyu Wang ◽  
...  

A CA-Eu(III) complex was synthesized by the coordination reaction of cellulose acetate (CA) and Eu3+ to obtain a CA-Eu light conversion film. This product was then doped with Tb(III) to sensitize the luminescence of Eu3+, which could functionalize the CA film. FTIR and XPS showed that the oxygen atoms in C=O, C–O (O=C–O), and O–H were involved in the complexation with Eu3+ and formed a Eu–O bond. SEM revealed that Eu3+ filled in the pores of the CA film. By changing the experimental conditions, the best fluorescence performance was obtained at the CA: Eu3+ ratio of 3:1 with a reaction time of 65 min. The energy transfer between Tb3+–Eu3+ could be realized by doping Tb3+ to enhance the luminescence of Eu3+. The best fluorescence performance of the CA-Eu-Tb light conversion film was at a Eu3+:Tb3+ ratio of 3:1. Compared with the CA film, the light conversion film has high transparency, high tensile strength, and good flexibility. It can convert the ultraviolet light harmful to plants into red light that is beneficial to photosynthesis. This offers high efficiency and environmental protection in the field of agricultural films.


2020 ◽  
Vol 59 (11) ◽  
pp. 821-847
Author(s):  
Geraldine Cabrera ◽  
Jordane Charbonnier ◽  
Gérard Pichon ◽  
Abderrahim Maazouz ◽  
Khalid Lamnawar
Keyword(s):  

Author(s):  
Violetta V. Nazarova

We examine the process of restoring the cinema network of the Tambov Region in the post-war period. This process went gradually and quickly enough. And this is despite the fact that the Tambov Region, in fact, as well as the whole country experienced the severe consequences of the Great Patriotic War. It is proved that the cinema was given a great propaganda function and this art form was actively used by the authorities. During the considered period, films were filmed catastrophically little and not the least role played here by the ideology of the film repertoire. In the Tambov Region, in addition to feature films, agricultural short films and scientific films were shown on portable film projectors. As a matter of fact, this is due to the fact that in a short time it was necessary to restore the industry. Agricultural films carried cognitive and motivating func-tions. It was for this purpose during the planting and harvesting campaigns that collective farmers, employed in the fields, were provided with mobile cinema installations. It is noted that the authori-ties actively interfered not only in the process of film production, but also in provision of film-showing facilities. In particular, much attention was paid to how much money goes to the local budget. Measures have been taken to implement the approved plans. The failure to comply was condemned in every way, and in some cases the violators were punished.


Materials ◽  
2019 ◽  
Vol 12 (8) ◽  
pp. 1312
Author(s):  
Alexandra Muñoz-Bonilla ◽  
Coro Echeverría ◽  
Águeda Sonseca ◽  
Marina P. Arrieta ◽  
Marta Fernández-García

This special issue “Polymeric Materials: Surfaces, Interfaces and Bioapplications” was proposed to cover all the aspects related to recent innovations on surfaces, interfaces and bioapplications of polymeric materials. The collected articles show the advances in polymeric materials, which have tremendous applications in agricultural films, food packaging, dental restoration, antimicrobial systems and tissue engineering. We hope that readers will be able to enjoy highly relevant topics that are related to polymers. Therefore, we hope to prove that plastics can be a solution and not a problem.


2019 ◽  
Vol 127 ◽  
pp. 210-221 ◽  
Author(s):  
Yinlei Yu ◽  
Pengfei Xu ◽  
Shiling Jia ◽  
Hongwei Pan ◽  
Huiliang Zhang ◽  
...  

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