线性脂环族聚酰胺化学结构对其力学和光学性能的影响

以重复单元结构不同的3种线性脂环族聚酰胺(LATPA)材料为研究对象,通过核磁共振谱、红外光谱、热分析、X射线衍射等技术,研究了链结构单元的侧基、端基对材料聚集态结构的影响,并对比研究了不同聚集态结构材料的宏观力学性能和光学透明性差异,建立了链结构、聚集态结构与力学性能、光学性能的关系.研究发现,侧基带来的大空间位阻降...

Effects of Linear Alicyclic Polyamide Chemical Structure on the Mechanical and Optical Properties

The three kinds of linear alicyclic polyamides(LATPA)with different repeating units were studied by a combination of Nuclear magnetic resonance spectroscopy(NMR),Fourier transform infrared spectroscopy(FTIR),thermal analysis,X-ray diffraction(XRD).The influence of the side and terminal groups of the chain structure on the aggregation structure of materials was discussed.The mechanical properties and optical transparences of LATPA with different aggregation structures were also compared.The relationship between chain structure,aggregation structure,and mechanical and optical properties was established.The results indicated that the steric hindrance of the side group prevented the chains to get organized orderly and reduced the crystallinity of LATPA,moreover,increased the glass transition temperature(Tg)of the material.The polymer chains can be packed more regularly and the crystallization can be boosted if the terminal extender groups are flexible aliphatic segments.The aggregation structures directly affect the mechanical properties.All LATPAs with amorphous and microcrystalline structures have excellent optical transparency.The former has slightly higher transparency,while the latter has the highest tensile strength and modulus,which is the contribution of microcrystalline structures to mechanical properties.