线性脂环族聚酰胺化学结构对其力学和光学性能的影响  

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

作　　者：周臣旭 董思远 朱平[1] 刘继广[3] 董侠[1,2] 王笃金 Chen-xu Zhou;Si-yuan Dong;Ping Zhu;Ji-guang Liu;Xia Dong;Du-jin Wang(Beijing National Laboratory for Molecular Sciences,Key Laboratory of Engineering Plastics,Institute of Chemistry Chinese Academy of Sciences,Beijing 100190;University of Chinese Academy of Sciences,Beijing 100049;College of Material Science and Engineering,Beijing Institute of Fashion Technology,Beijing 100029)

机构地区：[1]中国科学院化学研究所,中国科学院工程塑料重点实验室,北京分子科学国家实验室,北京100190 [2]中国科学院大学,北京100049 [3]北京服装学院材料科学与工程学院,北京100029

出　　处：《高分子学报》2021年第3期297-303,共7页Acta Polymerica Sinica

基　　金：国家重大研发计划重点专项(项目号2017YFB0307600)资助.

摘　　要：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低了LATPA的结晶度,提高了材料的玻璃化转变温度;较长的柔性端基分子链有助于高分子链的有序规整排列,可生成尺寸很小的微晶;聚集态结构直接影响材料的力学和光学性能,无定形LATPA和含有微晶结构的LATPA都具有良好的光学透明性,前者的透明性更高,后者的综合力学性能更好.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.

关 键 词：线性脂环族聚酰胺 链结构 聚集态结构 力学性能 光学透明性 

分 类 号：TQ323.6[化学工程—合成树脂塑料工业]