当前位置: X-MOL 学术Polym. Degrad. Stabil. › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
Combined effect of UVA radiation and agrochemicals on the durability of agricultural multilayer films
Polymer Degradation and Stability ( IF 5.9 ) Pub Date : 2018-06-20 , DOI: 10.1016/j.polymdegradstab.2018.06.012
Demetres Briassoulis , Miltiadis Hiskakis , Philippos Tserotas

New generation agricultural films combine multilayer technologies, with the latest developments in chemicals resistant UV stabilisers and possibly the incorporation of barrier layers against agrochemicals. The photo-degradation behaviour of a series of experimental multilayer (ML) films exposed to accelerated ageing in combination with agrochemicals, was analysed. It has been shown that the presence of a barrier layer (EVOH or PA) adversely affects the mechanical behaviour of ML films, because of the low ductility of these barrier layers, whose failure is propagating to the other layers leading to premature failure of ML film structures. ML films with barrier layer have shorter lifespan due to the rapid photo-degradation of the barrier layer. It was confirmed that these layers absorb the main part of the agrochemicals load, acting as effective barriers. Agrochemicals were shown to accelerate the detrimental effect of the UVA radiation on PA and EVOH layers causing premature failure of the barrier layers, compromising evenmore the mechanical strength and durability of the entire film. The presence of barrier layers such as PA (mainly) and EVOH in agricultural ML films is not recommended, as both their mechanical properties and photodegradation behaviour are adversely affected by the presence of low ductility barrier layers, deteriorated by the combination of UVA radiation and agrochemicals.



中文翻译:

UVA辐射和农药对农业多层膜耐久性的综合影响

新一代农用薄膜结合了多层技术,耐化学药品紫外线稳定剂的最新发展以及可能结合了针对农药的阻隔层。分析了一系列加速老化的实验多层(ML)膜与农药的光降解行为。已经显示,阻挡层(EVOH或PA)的存在对ML膜的机械性能产生不利影响,因为这些阻挡层的延展性低,其失效正在蔓延到其他层,从而导致ML膜过早失效。结构。具有阻挡层的ML膜由于阻挡层的快速光降解而具有较短的寿命。可以肯定的是,这些层吸收了农用化学品负荷的主要部分,充当有效的壁垒。农药显示出可加速UVA辐射对PA和EVOH层的有害作用,从而导致阻挡层过早失效,甚至进一步损害了整个薄膜的机械强度和耐久性。不建议在农业ML薄膜中使用阻挡层,例如PA(主要是PA)和EVOH,因为它们的机械性能和光降解行为都会受到延展性较低的阻挡层的不利影响,而低延展性阻挡层的存在会因UVA辐射和农药的组合而恶化。

更新日期:2018-06-20
down
wechat
bug