聚醚酮酮共聚物的结构表征及热分解行为  被引量:3

Structural Characterization and Thermal Decomposition Behavior of Poly(ether ketone ketone)Copolymers

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作  者:尚敬诏 宋平[2,3] 李光辉 孙庆民 王永 魏志勇 Jingzhao Shang;Ping Song;Guanghui Li;Qingmin Sun;Yong Wang;Zhiyong Wei(Department of Polymer Materials,School of Chemical Engineering,Dalian University of Technology,Dalian 116024,China;School of Materials Science and Engineering,North University of China,Taiyuan 030051,China;Shandong Kaisheng New Materials Co.,Ltd,Zibo 255185,China)

机构地区:[1]大连理工大学化工学院高分子材料系,辽宁大连116024 [2]中北大学材料科学与工程学院,山西太原030051 [3]山东凯盛新材料股份有限公司,山东淄博255185

出  处:《高分子材料科学与工程》2022年第11期73-80,共8页Polymer Materials Science & Engineering

摘  要:对聚醚酮酮共聚物的分子结构和热分解行为进行了详细的研究。采用红外光谱、核磁共振氢谱和核磁共振碳谱对聚醚酮酮的结构进行了分析表征,所得结果与聚合物预期分子结构相一致。由于聚醚酮酮苯环上的氢所处环境相似,化学位移相近,出现了部分峰的重叠,导致核磁共振氢谱难以准确地确定对苯和间苯的比例,但通过核磁共振碳谱可确定结构中二者的比例。通过差示扫描量热仪、热重分析和热重-红外-气质联用技术对聚醚酮酮的热分解行为进行了研究。结果表明,随着高温处理时间的延长,聚合物发生了交联,结晶能力减弱、玻璃化转变温度升高、熔点降低。与对苯/间苯的比例无关,聚醚酮酮共聚物的5%失重温度都在559~565℃之间,并且加热至800℃后仍具有较高的残碳量,说明具有较好的热稳定性。最后,对其热分解产物及分解机理进行了探究分析。The structure and thermal decomposition behavior of poly(ether ketone ketone)(PEKK)copolymers were studied in detail.The structure of PEKK was characterized by FT-IR,1H-NMR and ^(13)C-NMR.The obtained results are consistent with the expected polymer structure.Due to the similar chemical shifts of the hydrogens on the benzene ring of the PEKK,some peaks overlap,thus it is difficult to determine the ratio of terephthaloyl and isophthaloyl(T/I)in the structure by 1H-NMR.Therefore,the T/I ratio in the structure was determined by ^(13)C-NMR.The pyrolysis behavior of PEKK was studied by DSC,TGA and TG-IR-GC/MS.With the prolongation of high-temperature treatment time,the polymer is cross-linked,so the crystallinity and melting point decrease,and the glass transition temperature increases.Regardless of the ratio of T/I,the 5%mass loss temperature of PEKK copolymer is between 559~565℃,and it still has a high residual carbon content at 800℃,which indicates that the PEKK copolymer has the good thermal stability.Finally,the thermal decomposition products and decomposition mechanism were explored.

关 键 词:聚醚酮酮 热分解 热重-红外-气质三联 

分 类 号:TQ324.8[化学工程—合成树脂塑料工业]

 

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