In order to improve the properties of rice straw fiber film, one factor contrast test method was employed. Plasticizer type was chosen as input variable, dry tension strength and elongation, wet tension strength and e...In order to improve the properties of rice straw fiber film, one factor contrast test method was employed. Plasticizer type was chosen as input variable, dry tension strength and elongation, wet tension strength and elongation, bursting strength and tearing strength were chosen as indexes. The results showed that there were significant differences among the means of dry tension strength, dry elongation and bursting strength of different plasticizers; there were not significant differences among the means of wet tension strength, wet elongation and tearing strength of different plasticizers; for dry tension strength and elongation, glycerol had a significant difference with sorbitol and PEG, no significant difference was observed between sorbitol and PEG, dry tension strength added glycerol had been reduced 6.8% compared with that added sorbitol, reduced 9.5% compared with that added PEG; elongation had been improved 6.1% and 9.4%, respectively; for bursting strength, sorbitol had a significant difference with glycerol and PEG, no significant difference was observed between glycerol and PEG; bursting strength added glycerol and added PEG had been improved 6.9% and 5.6%, respectively compared with that of the added sorbitol. The results provided a theoretical reference for further improving the straw fiber film manufacturing process.展开更多
基金Supported by the Fund of Science and Technology Research Project of the 12th Five-year Plan(2012BAD32B02-5)
文摘In order to improve the properties of rice straw fiber film, one factor contrast test method was employed. Plasticizer type was chosen as input variable, dry tension strength and elongation, wet tension strength and elongation, bursting strength and tearing strength were chosen as indexes. The results showed that there were significant differences among the means of dry tension strength, dry elongation and bursting strength of different plasticizers; there were not significant differences among the means of wet tension strength, wet elongation and tearing strength of different plasticizers; for dry tension strength and elongation, glycerol had a significant difference with sorbitol and PEG, no significant difference was observed between sorbitol and PEG, dry tension strength added glycerol had been reduced 6.8% compared with that added sorbitol, reduced 9.5% compared with that added PEG; elongation had been improved 6.1% and 9.4%, respectively; for bursting strength, sorbitol had a significant difference with glycerol and PEG, no significant difference was observed between glycerol and PEG; bursting strength added glycerol and added PEG had been improved 6.9% and 5.6%, respectively compared with that of the added sorbitol. The results provided a theoretical reference for further improving the straw fiber film manufacturing process.
文摘为探究碳含量、稳定碳同位素比值(δ^(13)C)与塑料薄膜降解性的关系,在各平台收集了89个市售塑料薄膜制品,按种类将其分为纯PE薄膜(Polyethylene Films,PEF)、降解助剂添加型薄膜(Degradation Aid-added Films,DAF)、生物基薄膜(Bio-based Films,BF)、混合基薄膜(Mixed Films,MF)。用热水、稀盐酸、过氧化氢对其逐级处理后,测定原样和逐级处理后残余物的碳含量和δ^(13)C值。结果表明,薄膜原样的碳含量均值表现为PEF(84.22%±1.00%)>DAF(72.93%±2.28%)>BF(59.52%±2.18%)>MF(53.00%±1.67%),δ^(13)C值均值表现为PEF(-29.04‰±0.26‰)<DAF(-29.02‰±0.40‰)<MF(-25.09‰±0.46‰)<BF(-23.79‰±0.92‰)。不同类型的塑料薄膜经热水处理后的碳含量和δ^(13)C值与原样相比均无明显差异;但稀盐酸处理后DAF和BF的碳含量分别升高了9.34个百分点和11.32个百分点,而PEF和MF碳含量几乎不变。对于δ^(13)C值来说,PEF仅偏负0.19个千分点,DAF、BF、MF的偏负值分别是PEF的5.4倍、11.6倍和6.8倍;过氧化氢处理对BF影响最大,碳含量同原样相比升高了10.25个百分点,δ^(13)C值偏负3.14个千分点。经化学逐级处理后四种类型塑料薄膜碳含量最终都呈升高趋势,δ^(13)C值呈偏负趋势。在建立的Logistic回归模型中,ROC曲线下面积(Area Under the Curve,AUC)为0.95,预测准确率达到86.5%,因此可通过样品碳含量和热水处理后δ^(13)C值对塑料薄膜的降解类型进行鉴别。
