树枝状PA 6的制备及其性能研究  

Preparation and properties of dendritic PA 6

作　　者：姚亮红 YAO Lianghong(SINOPEC Hunan Petrochemical Co.,Ltd.,Yueyang 414014)

机构地区：[1]中石化湖南石油化工有限公司,湖南岳阳414014

出　　处：《合成纤维工业》2023年第5期51-54,共4页China Synthetic Fiber Industry

基　　金：中石化股份有限公司研究项目(219005-3)。

摘　　要：以支化单体聚酰胺胺(PAMAM)和己内酰胺为原料,采用两步原位聚合工艺制备了树枝状聚酰胺6(PA 6),研究了树枝状PA 6的断面形貌、分子结构及其热性能、流变性能、力学性能。结果表明:两步原位聚合工艺克服了制备过程中凝胶颗粒和交联物的生成;与线型PA 6相比,树枝状PA 6的熔融峰温度更低,熔融峰宽更宽;随着PAMAM含量的增大,树枝状PA 6的熔体流动指数(MFI)增大,但当加入的PAMAM质量分数大于0.6%时,树枝状PA 6的MFI的增大幅度减缓;随着PAMAM含量的增大,树枝状PA 6的缺口冲击强度、断裂伸长率、拉伸强度、弯曲强度呈先增大后减小趋势,当加入的PAMAM质量分数为0.6%时,制备的树枝状PA 6的力学性能最优,MFI为每10 min 49.41 g,拉伸强度为77.1 MPa,断裂伸长率为85.4%,缺口冲击强度为18.2 kJ/m^(2),弯曲强度为129.8 MPa。Dendritic polyamide 6(PA 6)was prepared from branched monomer polyamide amine(PAMAM)and caprolactam by two-step in-situ polymerization.The fracture morphology,molecular structure,thermal properties,rheological properties and mechanical properties of dendritic PA 6 were studied.The results showed that the two-step in-situ polymerization process overcame the formation of gel particles and crosslinks during the preparation process;compared with linear PA 6,dendritic PA 6 had a lower melting peak temperature and wider melting peak;the melt flow index(MFI)of dendritic PA 6 increased with the increase of PAMAM content,but the increase in MFI of dendritic PA 6 slowed down when the mass fraction of PAMAM added was higher than 0.6%,and the notch impact strength,elongation at break,tensile strength and bending strength of dendritic PA 6 showed a first increasing and then decreasing trend with the increase of PAMAM content;and the prepared dendritic PA 6 exhibited the optimal mechanical properties,including an MFI of 49.41 g per 10 min,tensile strength of 71.1 MPa,elongation at break of 43.6%,notch impact strength of 18.2 kJ/m^(2) and bending strength of 129.8 MPa,when the mass fraction of PAMAM added was 0.6%.

关 键 词：树枝状聚酰胺6 聚酰胺胺 己内酰胺 支化结构 性能 

分 类 号：TQ340.42[化学工程—化纤工业]