基于异甘露醇和间苯二甲酸的光学共聚酯的合成及性能表征

发布时间：2019-05-10 18:28

【摘要】：合成了聚(对苯二甲酸乙二醇酯-共-对苯二甲酸异甘露醇酯-共-间苯二甲酸乙二醇酯-共-间苯二甲酸异甘露醇酯)(PEIIT).通过差示扫描量热分析(DSC)、紫外-可见-近红外光谱(UV-Vis-NIR)、X射线衍射(XRD)、偏光显微镜(POM)球晶培养等分析方法研究了PEIIT的结晶性能、光学性能及热性能.阐述了增加四元共聚酯PEIIT中间苯二甲酸结构单元的含量可以有效降低其结晶度和结晶速率的具体机制.间苯二甲酸结构单元含量的增加使PEIIT链段运动过程中的空间位阻增大,结晶能力降低,其冷结晶温度逐渐升高,热结晶温度逐渐降低直至不再有热结晶现象产生.由于结晶程度的降低,PEIIT的雾度可以完全降为零,并且透光率可以达到90.7%.同时发现了造成PEIIT透光率降低的吸光因素,黄变程度增加使330~550 nm波长的蓝紫光被PEIIT吸收,导致其透光率受到影响.PEIIT的熔点受间苯二甲酸含量变化影响较大,但仍保持了良好的耐热分解性能.
[Abstract]:Poly (ethylene terephthalate)-co-isomannitol terephthalate-co-ethylene terephthalate-co-isomannitol isophthalate) (PEIIT). Was synthesized. The crystallization properties of PEIIT were studied by differential scanning DSC (DSC),) UV-vis-near infrared spectroscopy (UV-Vis-NIR) and X-ray diffraction (XRD), polarizing microscope (POM) spherulite culture. Optical and thermal properties. The mechanism of increasing the content of intermediate phthalic acid structure unit in quaternionic polyester PEIIT can effectively reduce the crystallization degree and crystallization rate. With the increase of the content of isophthalic acid structural units, the steric hindrance and crystallization ability of PEIIT segments increased, the cold crystallization temperature increased gradually, and the thermal crystallization temperature decreased until there was no longer thermal crystallization phenomenon. Due to the decrease of crystallization degree, the haze of PEIIT can be completely reduced to zero, and the transmittance can reach 90.7%. At the same time, it was found that the absorption factor of PEIIT decreased, and the blue and purple light at the wavelength of 330 脳 550 nm was absorbed by PEIIT with the increase of yellowing degree, which affected the transmittance of PEIIT. the melting point of peit was greatly affected by the change of isophthalic acid content. However, it still maintains good thermal decomposition performance.
【作者单位】：哈尔滨工业大学化工与化学学院;
【分类号】：O633.14

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