羧基含量可控氮杂环聚芳醚砜反应性增韧601环氧树脂  

Reactive Toughening Modification of 601 Epoxy Resin Using Poly(phthalazinone ether sulfone)s Bearing Pendant Carboxyl Groups

作　　者：郭鸿俊[1] 王雪[2] 宗立率 李健芳[1] 王锦艳[2] 李桂洋 蹇锡高[2] Hong-jun Guo;Xue Wang;Li-shuai Zong;Jian-fang Li;Jin-yan Wang;Gui-yang Li;Xi-gao Jian(Aerospace Research Institute of Materials and Processing Technology,Beijing 100076;Department of Polymer Science ＆ Materials,Dalian University of Technology,Dalian 116024)

机构地区：[1]航天材料及工艺研究所,北京100076 [2]大连理工大学化工学院,大连116024

出　　处：《高分子学报》2018年第9期1236-1243,共8页Acta Polymerica Sinica

基　　金：国家重点基础研究发展计划(863计划;项目号2015AA033802);国家自然科学基金-石油化工联合基金(基金号U1663226)和国家自然科学基金-青年基金(基金号51603058)资助项目

摘　　要：采用酚酞啉(PPL)、二氮杂萘酮双酚(DHPZ)等单体制备了羧基含量可控的杂萘联苯结构聚芳醚砜(PPES-P),聚合物主链羧基含量与分子设计一致性较高,玻璃化转变温度(Tg)均达到260°C以上,具有优异的热稳定性和溶解性.进一步选取不同羧基含量的PPES-P对601环氧树脂体系进行反应性增韧改性,考察PPES-P羧基含量对树脂体系力学性能和热稳定性的影响.结果表明:PPES-P树脂与601环氧树脂相容性较好,羧基作为交联点能够参与环氧树脂固化反应,强化了增韧组分与基体树脂的界面结合能力,PPES-P反应性增韧改性不仅提高了601环氧树脂体系的冲击与弯曲性能,还保持了树脂体系较高的Tg,其中PPL与DHPZ结构单元为1:3的PPES-P13改性后树脂冲击强度提高了43%,试样断裂面为均相结构且呈韧性断裂形貌.A series of poly（aryl ether sulfonephthalazinone）s（PPES-Ps）containing pendent carboxyl groups and N-heterocyclicphthalazinone units were derived from phenolphthalin（PPL）and 4-（3-chloro-4-hydroxylphenyl）（2H）-phthalazin-1-one（DHPZ）with 4,4′-dichlorodiphenyl sulfone（DCS）via＂one-pot＂solution polymerization.The structure of the resulting polymers was elaborately controlled by tailoring the feed ratio of the two diphenols to have a balance between the carboxyl content and the thermal resistance.As evidenced by NMR analysis,the structure of the corrsponding polymers along with the carboxyl content is consistent with those designed.PPES-Ps also exhibit high glass transition temperature（Tg260°C）and excellent thermal stability as well as good solubility,mainly originating from the rigid,bulky,non-coplanar phthalazinone units.As the content of phthalazinone unit increases,both Tg and solubility demostrate an increasing trend.Furthermore,the copolymers with different contents of carboxyl groups are used to reactively toughen 601 epoxy resin.The mechanical and thermal properties of the obtained blending system are investigated in details.The results indicate that the pendant carboxyl groups in PPES-P can efficiently react with the epoxy groups of 601 resin during the thermal curing,leading to cross-linking networks by covalent bonding,which can not only improve the fracture toughness and flexural properties,but also maintain the high Tg of 601 epoxy resin.The impact strength of 601epoxy resin,reactively toughened by PPES-P13 derived from PPL/DHPZ with the molar ratio of 1：3,is 43%higher than that of unmodified 601 resin.Meanwhile,the fracture of impact specimen shows a toughened fracture character,and no phase separation is observed on the crack surface,even with a high concent（15%）of PPES-P,which means that the reactive carboxyl moiety could enhance the compatibility between the high rigid poly（aryl ether）s and the epoxy resins.The 601 resins,reactively modified with PPES-Ps t

关 键 词：反应性增韧 601环氧树脂 聚芳醚砜 耐热性能 

分 类 号：TQ323.5[化学工程—合成树脂塑料工业]