【作者】 戴晓晖；

【导师】 姜振华；

【作者基本信息】 吉林大学 ， 材料学， 2004， 硕士

【摘要】 随着高技术的发展，人们对材料的要求越来越高，高性能工程塑料得到了日益广泛的关注，其中以聚醚醚酮(PEEK)为代表的半结晶性的聚芳醚酮材料由于其优异的耐热性、耐辐照性、高强度等特点在电子、交通、宇航等领域具有广泛的应用。但是随着应用目的与应用环境的不同需要，此类性能优异的特种工程塑料已经不能满足其应用的需求。人们不断开发性能优异的此类新材料，在聚合物主链上引入不同的功能基团（如萘环、氮杂萘环等）、以及在主链上引入侧基功能基团（如苯、三氟甲基等），来提高聚芳醚酮的溶解性，或者通过共聚和共混等方式来进一步改善材料的使用性能和加工性能。聚芳醚酮新品种开发中的“高温加工、低温使用”的困难是热塑性材料的缺点。而热固性材料在这方面则有无比优越的特性，则可以做到“低温加工、高温使用”，但是热固性材料在加工一些特殊几何形状的铸件则存在一定的困难。因此我们希望开发一种材料，它加工以前是热塑性材料，可以采用热塑性材料的加工方法，加工后转变成为热固性材料，具有热固性材料的使用优点，从而兼具两种材料的优点。交联正是将热塑性材料转变成热固性材料的一个有力的手段。本文先从设计分子结构开始的，将具有特殊功能的基团引入到聚芳醚酮体系中来实现聚合物的功能化。基于聚芳醚酮的分子链段的特点，必须在分子设计过程中引入可交联点，为此，本文在聚芳醚酮侧链中引入丙烯基，来提高此类聚芳醚酮材料的溶解性，合成出可溶于常规极性有机溶剂中的无定形聚合物，然后在成型后用活性基团的加成交联反应得到一类新型的不溶不熔的热固性工 68<WP=75>吉林大学硕士学位论文程塑料。 利用芳基取代反应和克莱森重排反应，制得含烯丙基的双酚单体，重结晶纯化得纯度 99%以上。以自制双酚单体和二氟二苯酮在溶剂/碱中的亲核取代反应合成了新型含丙烯基侧基的高分子量聚芳醚酮，提出了“缩聚-原位异构化”反应。通过产物结构分析确证了反应过程中“烯丙基-丙烯基”的重排，并且发现丙烯基以全反式（Z）构型存在于聚芳醚酮的分子结构中。并且对新型含丙烯基聚合物材料进行了性能方面的研究。 研究表明取代侧基的存在，破坏了分子链堆砌的规整性，聚合物材料为无定形样品，含丙烯基的聚芳醚酮类聚合物材料具有很好的溶解性和成膜性能。 通过合成方法得到的新型可溶性含丙烯基聚合物材料在交联前后性能变化明显：通过 DSC 方法监测热交联反应，从玻璃化转变的具体数值可以看到无论是在空气环境下还是在氮气环境下，聚合物热交联的最佳温度为 320OC. 聚合物在 320OC 热处理以后，玻璃化转变温度明显增加。在我们所应用的光照强度下，含丙烯基侧基取代的聚合物的玻璃化转变温度随着 UV 光照时间的增加并不是很明显的增加。但在后面的溶解性实验中，我们发现光交联的聚合物有凝胶出现。聚合物在热处理后溶解过程中也有凝胶出现，且随着幅照时间以及热处理时间和温度的的增加，凝胶含量增加。这些结果都表明聚合物材料在热交联和UV 辐照后有交联键生成.。 聚合物在交联以后具有较高的热分解温度，比交联以前温度升高10℃-30℃表现了很好的热稳定性。更多还原

【Abstract】 Accompany with the development of high-technology, high-performanceengeering thermoplastics have been paid much attention while the demandingto materials become more and more critical. Poly( ether ether ketone) (PEEK),which is the typical representative in Poly(aryl ether ketone)s (PAEKs) family,have been applied in electronics, transports, aerospace fields et al for itsoutstanding properties such as high thermal stability, radiation resistance, highmodulus. The physical properties of the polymers depend very much on thechemical structure. Therefore new monomers containing substituent groupwere designed and synthesized to introduce into chain of PAEKs. The difficulty encountered during the development of new PAEKS must be ascribed to the common shortcoming of thermoplastics. On the contrary, the thermosets can be processed at lower temperature and be applied at higher temperature while they cannot be found to a mold. So we hope to develop a kind of material which can be processed as thermoplastics and being used as thermosets. Cross-linking is a suitable and powerful method to transform thermoplastics to thermosets. Here cross-linkable propenyl group was introduced to the side chain of PEEK. A novel soluble poly(ether ether ketone) with propenyl groups aslateral substituents was synthesized through nucleophilic substitution route. Monomer 3,3’-dially-4,4’-dihydroxybiphenyl (DABP) was synthesized byMeerwein aryl-substitution reaction and based on Clasein arrangement. Polymerswere also prepared through the nucleophilic substitution displacement reactionwith activated difluoro monomer 4-4’difluorobenzophenone and monomer3,3’-dially-4,4’-dihydroxybiphenyl (DABP) with K2CO3 as base, N,N-Dimethyl 70<WP=77>吉林大学硕士学位论文formamide(DMF) was used as a solvent at 160℃ for 5h. The reaction mixturewas poured into large distilled water and continuous turning and polymermaterials were obtained. After the crude product was crushed, filtered, washed,and dried, a new pendant group, propenyl was developed to functionalize PEEKby a novel process-polycondensation-in situ isomerization. It was characterizedand studied its properties by FTIR, H-NMR ,UV-Vis , WAXD, GPC and DSC. 1 Existing of substituent pendant groups destroyed the crystal property of thesepolymers with high molecular weight. These polymers containing pendantpropenyl were soluble well in organic solvents such as DMF, DMAC, THF, andthe membrane material had high intension and tenacity properties. The thermal properties of soluble polymer containing pendant propenyl weremagnitude change. The suitable cross-linking condition was determinded by DSC.There was no linearly change on the glass transition temperature (Tg) of polymerheat treated at 250oC or 280oC . The glass transition temperature (Tg) of polymerincreased linearly after the polymer was cured by heat treat at 320oC. It was showthat 320oC is the suitable crosslinking temperature under nitrogen atmosphere orO2 atmosphere. When the polymer irradiated by UV, its Tg not increased linearlywith irradiation times increasing. But Gel phenomina was show when polymerwas heat treated or irraditioned by UV. The results indicated that the crosslinkingstructure had formed when polymer materials were heat treated or irradioned byUV. At the same time, the polymer’s thermal stability was elevated aftercross-linking.更多还原