摘要
以碱木质素(Lig)为原料,3-氨丙基三甲氧基硅烷、4-(二乙氨基)水杨醛和9,10-二氢-9-氧-10-磷杂菲-10-氧化物为改性剂,通过三步法成功制备了一种含磷、氮、硅元素的木质素基阻燃剂(FR-Lig)。热失重分析表明,与Lig相比,FR-Lig在空气中具有良好的热稳定性能和成炭能力,其T5%提高了45℃,550℃时的残留量由1.8%提高到31.6%。然后将FR-Lig用于制备全生物基阻燃聚乳酸复合材料(FR-Lig/PLA),对材料的阻燃性能、热稳定性能、燃烧行为等进行了研究。结果表明,FR-Lig的加入可提高PLA的阻燃性能,当添加量为20%时,LOI值可增加至27.5%,垂直燃烧Ul-94过V-0级;即使质量分数10%的加入,也可使PLA的LOI值增加2个数值,UL-94由无等级提高至V-2级,对应PLA的拉伸强度为41.8 MPa,与纯PLA相比,冲击强度可提升约60%;而且,FR-Lig/PLA材料的热稳定性能、耐火性能和抑烟能力得到了提升。此外,残炭的表征及PLA的热重-红外联用分析表明,气相阻燃和凝聚相阻燃在PLA中共同发挥作用,以后者为主,并提出了可能的阻燃机理。
Lignin-based flame retardant(FR-Lig)containing phosphorus,nitrogen and silicon elements was successfully prepared through alkali lignin(Lig)with 3-aminopropyl trimethoxysilane,4-(diethylamino)salicylaldehyde and 9,10-dihydro-9-oxa-10-phosphorophenanthrene-10-oxide as modifiers by a three-step process.TGA results of FR-Lig show that compared with Lig,FR-Lig presents good thermal stability and charring ability in air,with T5%increased by 45℃,and the residual at 550℃ enhanced from 1.8%to 31.6%.FR-Lig was used to prepare fully bio-based flame retardant polylactic acid composites(FR-Lig/PLA),and the properties of FR-Lig/PLA were investigated in detail.It suggest that with the addditon of FR-Lig,the flame retardancy of PLA is improved.And with 20%FR-Lig loading amoun,the LOI value of PLA is increased to 27.5%,and the vertical combustion UL-94 passes V-0 level.Even if 10%FR-Lig can increase LOI of PLA by 2 values accompanied with UL-94 improving from no grade to V-2 grade;and the tensile strength of PLA reaches 41.8 MPa,and impact strength is increased by about 60%compared with pure PLA.Moreover,the thermal stability,fire resistance,and smoke suppression capabilities of PLA with 10%FR-LIg are enhanced.The analysis results of residual char and TG-IR for PLA show that both gas-phase flame retardancy and condensed phase flame retardancy work in PLA,in which the laterr plays a dominant role,and a possible flame retardant mechanism was proposed.
作者
宋艳
杨晓涵
林肯
单雪影
李锦春
Yan Song;Xiaohan Yang;Ken Lin;Xueying Shan;Jinchun Li(School of Materials Science and Engineering,Changzhou University,Changzhou 213164,China;School of Environmental Science and Engineering,Changzhou University,Jiangsu 213164,China)
出处
《高分子材料科学与工程》
EI
CAS
CSCD
北大核心
2024年第3期12-22,共11页
Polymer Materials Science & Engineering
基金
江苏省科技厅产学研联合创新资金资助项目(BY2019080)
国家自然科学基金资助项目(51473024)。
关键词
碱木质素
生物基阻燃剂
聚乳酸
阻燃性能
热稳定性能
alkali lignin
biobased flame retardants
polylactic acid
flame retardancy
thermal stability
作者简介
通讯联系人:李锦春,主要从事无卤阻燃高分子材料的研究,E-mail:lijinchun88@163.com。
