聚氯乙烯薄膜对新型土壤熏蒸剂二甲基二硫阻隔性研究

The barrier property of polyvinyl chloride film to dimethyl disulfide—a new soil fumigant

为筛选适合的聚氯乙烯(PVC)薄膜替代目前广泛使用的聚乙烯(PE)薄膜配合二甲基二硫(DMDS)进行土壤消毒使用,本研究使用薄膜阻隔性测定装置、气相色谱-质谱联用仪进行阻隔性模拟及DMDS浓度测定,开展了7种PVC膜对DMDS阻隔性能的测定试验,并评价了温度、湿度对其阻隔性的影响。结果表明,供试PVC薄膜对DMDS的阻隔性均优于PE薄膜,但阻隔性随温度升高显著降低,湿度对其阻隔性无显著影响。增塑剂对PVC薄膜阻隔性能不产生显著影响,但纳米颗粒添加物对PVC薄膜阻隔性能有显著影响,添加糊树脂的高聚合度PVC薄膜阻隔性最好。本研究表明PVC薄膜对DMDS具有很好的阻隔性,在特定环境下可取代PE薄膜的应用,但需田间试验进一步确定其控制DMDS逸散的效果。

In order to screen suitable polyvinyl chloride film(PVC)to replace polyethylene film(PE)with dimethyl disulfide(DMDS)for soil disinfection,a special device and gas chromatography-mass spectrometry were used for film barrier simulation and DMDS concentration detection in this study.The barrier effects of seven kinds of PVC films were test against DMDS,and the impact of temperature and humidity on the barrier property was investigated.The results showed that the barrier properties of the seven kinds of PVC to DMDS were better than that of PE,but its performance decreased significantly with increasing temperature,while humidity had no significant effect on its performance.Plasticizer did not have a significant impact on the barrier performance of PVC film to DMDS,but the different additives of nanoparticles had a significant impact on the barrier performance of PVC film to DMDS;the barrier properties of PVC film with higher degree of polymerization added with paste resin were the best.This study suggested that PVC had a good barrier performance to DMDS and may replace the application of PE film under certain circumstances.However,field experiments are needed to further determine its effect in controlling the emission of DMDS.