聚 2, 5-呋喃二甲酸乙二醇酯/纳米二氧化钛/硅藻土复合材料的 制备和表征. (Chinese)

Preparation and Characterization of Poly (ethylene 2, 5-furandicarboxylate)/ TiO2 Nanoparticles/ Diatomaceous Earth Composites. (English)

A series of novel PEF/TiO2//diatomaceous earth (DE) composites are prepared from dimethyl 2, 5-furandicarboxylate (DMFD), ethylene glycol (EG), pyromellitic dianhydride (PMDA), DE and TiO2/ nanoparticles via in-situ polycondensation. And their structure, thermal properties, mechanical properties, gas permeability properties and ultraviolet shielding properties are characterized by nuclear magnetic resonance spectrometer (NMR), fourier transform attenuated total reflection infrared spectrometer (ATR-FTIR), X-ray diffractometer (XRD), thermogravimetric analyzer (TGA) and other technical means. The results show that the composites are successfully prepared, and nano-TiO2/ and DE are both physically doped. The DE particles are uniformly dispersed within PEF. All polyester powders have an amorphous aggregate structure. Compared with PEF, the temperature at 5% mass loss (Td, 5%) and the maximum mass loss rate (Tdmax) of PEF/TiO2//DE composites are increased by 12.1 and 8.4 ℃, respectively. The tensile modulus and impact strength of PEF/ TiO2/DE composites reach 2657 MPa and 3.2×10⁴ J/m², respectively. The CO2 and O2 permeability of PEF/ TiO2//DE composites are regulated by the addition of nano-TiO2/ and DE. The CO2 barrier improvement coefficient (BIFCO2) is increased from 3.02 for PEF/TiO2/ to 1.37~4.64, and the O2 barrier improvement coefficient (BIFCO2 ) is increased from 1.36 for PEF/TiO2/ to 0.7~2.07. In addition, PEF/TiO2/ has functional properties such as UV resistance with the addition of nano-TiO2/: the UV shielding rate of PEF/TiO2/ composites is increased by 85%, from 45.38% of PEF to 83.85% of PEF/TiO2/ composite films, and the UV shielding performance of PEF/TiO2//DE composites is greater than 84%. [ABSTRACT FROM AUTHOR]

以2, 5-呋喃二甲酸二甲酯 (DMFD) 、乙二醇 (EG) 为原料, 原位添加扩链剂均苯四甲酸二酐 (PMDA) 、 纳米二氧化钛 (TiO2) 、硅藻土 (DE), 以钛酸四丁酯为催化剂, 采用酯交换-熔融缩聚法制备聚 2, 5-呋喃二甲酸 乙二醇酯 (PEF) /TiO2/DE 复合材料。通过核磁共振波谱仪 (NMR) 、傅里叶变换衰减全反射红外光谱仪 (ATRFTIR) 、X射线衍射仪 (XRD) 和热重分析仪 (TGA) 等技术手段对其结构、热学性能、力学性能、气体渗透性能及 紫外屏蔽性能进行表征。结果表明, PEF/TiO2/DE复合材料被成功制备, 且 TiO2 及DE均为物理掺杂。DE粒子 在 PEF/TiO2/DE 复合材料内部分散良好。所有聚酯粉末为无定形聚集态结构。与 PEF 相比, PEF/TiO2/DE 复合 材料的 5%质量损失温度 (Td, 5%) 、分解速率最快温度 (Tdmax) 分别提升 12.1℃ 和 8.4℃。PEF/TiO2/DE 复合材料 的拉伸模量及抗冲击强度最高分别达到 2657 MPa 和 3.2×10⁴ J/m²。纳米 TiO2 和 DE 的引入调控了PEF/TiO2/DE 复合材料对 CO2、O2 的渗透性, CO2 屏障改善系数 (BIFCO2) 由PEF/TiO2 的 3.02 变为 1.37~4.64, O2 屏障改善系数 (BIFO2) 由 PEF/TiO2 的 1.36 变为 0.7~2. 07; 此外, 纳米TiO2 的加入赋予 PEF 良好的紫外屏蔽性能: PEF/TiO2 复 合材料的紫外屏蔽率由PEF的 45.38% 提高至 83.85%, 提高了 85%, PEF/TiO2/DE 复合材料的紫外屏蔽性能均 大于84%。 [ABSTRACT FROM AUTHOR]

Copyright of Chinese Journal of Applied Chemistry is the property of Chinese Journal of Applied Chemistry and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)