Abstract Cellulose acetate has a high melting temperature due to intense intermolecular hydrogen bonding and is not significantly different from the deterioration temperature, so decomposition may occur during processing. Generally, in order to prevent pyrolysis of CA in the melting process, it is dissolved by using a solvent such as CS2 or H2SO4. However, it is not suitable for extrusion and injection process, and plasticized CA composition is prepared using plasticizer. In general, Dioctyl phthalate (DOP) is the most widely used plasticizer, and polyethylene glycol (PEG), glycerin (GC) triacetin (TA) and the like are partly used as environmentally friendly plasticizers. In this study, lactic acid was used as a compatibilizer and viscosity modifier in addition to plasticizer to prepare a composite. When the content of lactic acid is 5 wt% or more, phase separation occurs, so that the viscosity of the composition is controlled by blending in the range of 1 ∼ 5 wt%. The melting characteristics of the prepared compositions were confirmed by DSC and TGA, and specimens were prepared by injection molding. The effect of lactic acid content on the melt viscosity was measured and the yield stress, yield strain and elastic modulus were calculated by the evaluation of tensile properties. The composition of this study showed a viscosity change of about 10 ∼ 50% compared with the conventional one and the thermal properties were also different. The thermal properties were also different. In addition, the change of mechanical strength was observed depending on the degree of commercialization of additives.

中文翻译：

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醋酸丙酸纤维素与乳酸共混物的熔体粘度和理化性质研究

摘要 醋酸纤维素由于分子间氢键强，熔融温度高，与劣化温度相差不大，加工过程中可能发生分解。一般为防止CA在熔融过程中热解，采用CS2或H2SO4等溶剂溶解。然而，它不适合挤出和注射工艺，并且使用增塑剂制备增塑的CA组合物。一般来说，邻苯二甲酸二辛酯（DOP）是应用最广泛的增塑剂，聚乙二醇（PEG）、甘油（GC）三醋精（TA）等部分用作环保增塑剂。在这项研究中，除了增塑剂外，还使用乳酸作为增容剂和粘度调节剂来制备复合材料。当乳酸含量为5wt%或更多时，发生相分离，使组合物的粘度通过共混控制在1～5wt％的范围内。制备的组合物的熔融特性通过 DSC 和 TGA 确认，样品通过注塑制备。测定乳酸含量对熔体粘度的影响，并通过拉伸性能的评价计算屈服应力、屈服应变和弹性模量。本研究的成分与常规成分相比，粘度变化约 10 ～ 50%，热性能也不同。热性能也不同。此外，观察到机械强度的变化取决于添加剂的商业化程度。使组合物的粘度通过共混控制在1～5wt％的范围内。制备的组合物的熔融特性通过 DSC 和 TGA 确认，样品通过注塑制备。测定乳酸含量对熔体粘度的影响，并通过拉伸性能的评价计算屈服应力、屈服应变和弹性模量。本研究的成分与常规成分相比，粘度变化约 10 ～ 50%，热性能也不同。热性能也不同。此外，观察到机械强度的变化取决于添加剂的商业化程度。使组合物的粘度通过共混控制在1～5wt％的范围内。制备的组合物的熔融特性通过 DSC 和 TGA 确认，样品通过注塑制备。测定乳酸含量对熔体粘度的影响，并通过拉伸性能的评价计算屈服应力、屈服应变和弹性模量。本研究的成分与常规成分相比，粘度变化约 10 ～ 50%，热性能也不同。热性能也不同。此外，观察到机械强度的变化取决于添加剂的商业化程度。和样品通过注塑制备。测定乳酸含量对熔体粘度的影响，并通过拉伸性能的评价计算屈服应力、屈服应变和弹性模量。本研究的成分与常规成分相比，粘度变化约 10 ～ 50%，热性能也不同。热性能也不同。此外，观察到机械强度的变化取决于添加剂的商业化程度。和样品通过注塑制备。测定乳酸含量对熔体粘度的影响，并通过拉伸性能的评价计算屈服应力、屈服应变和弹性模量。本研究的成分与常规成分相比，粘度变化约 10 ～ 50%，热性能也不同。热性能也不同。此外，观察到机械强度的变化取决于添加剂的商业化程度。本研究的成分与常规成分相比，粘度变化约 10 ～ 50%，热性能也不同。热性能也不同。此外，观察到机械强度的变化取决于添加剂的商业化程度。本研究的成分与常规成分相比，粘度变化约 10 ～ 50%，热性能也不同。热性能也不同。此外，观察到机械强度的变化取决于添加剂的商业化程度。