• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>RSC Advances >Synergistic effect of phosphorus–nitrogen and silicon-containing chain extenders on the mechanical properties, flame retardancy and thermal degradation behavior of waterborne polyurethane
【24h】

Synergistic effect of phosphorus–nitrogen and silicon-containing chain extenders on the mechanical properties, flame retardancy and thermal degradation behavior of waterborne polyurethane

机译：磷 - 氮和含硅链增量剂对水性聚氨酯的力学性能，阻燃性和热降解行为的协同作用

获取原文
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

With the aim to keep a balance between the flame retardancy and thermal stability as well as mechanical properties of waterborne polyurethane (WPU), a novel phosphorus–nitrogen–silicon containing flame retardant WPU (FRWPU) was synthesized by conjugating with a cyclic phosphoramidate lateral group bearing diol (named as PNMPD) and silane coupling agent KH-602 in the chain-extension and post-chain extension process, respectively. Significant enhancement in tensile strength (6.1 MPa) is obtained with the combined covalent incorporation of PNMPD and KH-602 rather than using PNMPD alone. A limiting oxygen index (LOI) value of 27.7% and a UL-94 vertical burning V-0 rating is achieved for FRWPU-12.6 with 12 wt% PNMPD and 60% post-chain extension ratio by KH-602, while the peak heat release rate (PHRR), total heat release (THR), peak smoke produce rate (SPR) and total smoke production (TSP) characterized by a cone calorimeter (CC) markedly reduce by 36.0%, 42.9%, 40.1% and 35.4%, respectively, compared to those of pure WPU, which is more efficient in flame retardancy than FRWPU-12.0 merely loaded with 12 wt% PNMPD. Meanwhile, the thermal degradation behaviors and flame-retardant mechanism of FRWPU were consistently confirmed by thermogravimetric analysis (TGA), scanning electron microscopy (SEM), thermogravimetry-Fourier transform infrared (TG-FTIR) spectroscopy, X-ray photoelectron spectroscopy (XPS) and Raman spectroscopy. All results indicate that the interactions between phosphorus and silicon elements in the condensed phase are mainly responsible for the dramatically reduced fire hazards, which inhibits the heat and flammable gas release and facilitates the formation of a more thermally stable graphitized char layer consisting of –P(O)–O–Si– structures.
机译：目的是在防火性和热稳定性之间保持平衡以及水性聚氨酯（WPU）的机械性能，通过与环状磷酸族横向基团缀合来合成一种新的含磷 - 氮 - 硅（FRWPU）的含磷阻燃WPU（FRWPU）在链延伸和后链后延伸过程中轴承二醇（命名为PNMPD）和硅烷偶联剂KH-602。用PnMPD和KH-602的组合共价掺入而不是单独使用PnMPD，获得抗拉强度（6.1MPa）的显着增强。对于FRWPU-12.6，实现了27.7％的限制氧指数（LOI）值和UL-94垂直燃烧V-0等级，通过KH-602具有12wt％PNMPD和60％的链链后延伸比和60％。释放率（PHRR），总热释放（THR），峰值烟雾产生速率（SPR）和总烟雾生产（TSP），其特征在于锥形量热计（CC）显着降低36.0％，42.9％，40.1％和35.4％，与纯WPU相比，分别与纯WPU相比，其在阻燃性比FRWPU-12.0更有效，仅加载12wt％pnmpd。同时，通过热重分析（TGA），扫描电子显微镜（SEM），热重度 - 傅里叶变换红外（TG-FTIR）光谱，X射线光电子能谱（XPS）持续确认FRWPU的热降解行为和阻燃机理和拉曼光谱。所有结果表明，冷凝阶段中磷和硅元件之间的相互作用主要负责大幅减少的火灾危害，这抑制了热和易燃气体释放，并促进了由-p的更具热稳定的石墨化的炭层的形成（ o）-o-si结构。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号