Zhang Tiefeng, Wang Chunfeng, Wang Yue, Wang Yongliang, Han Zhidong
School of Materials Science and Chemical Engineering, Harbin University of Science and Technology, Harbin 150040, China.
School of Transportation and Vehicle Engineering, Shandong University of Technology, Zibo 255000, China.
Polymers (Basel). 2022 Apr 15;14(8):1616. doi: 10.3390/polym14081616.
The flame retardancy of layered double hydroxides (LDHs) correlates with their structure and dispersion in a polymeric matrix. To improve the flame retardant effectiveness of Mg-Al LDH in polyethylene (PE), 2-carboxy ethyl (phenyl) phosphinic acid (CEPPA) was adopted as a flame retardant modifier to prepare CEPPA-intercalated LDH (CLDH) by the regeneration method, which was then exfoliated in PE by melt blending in the form of a masterbatch prepared from solution mixing. By compounding CLDH with intumescent flame retardant (IFR) composed of ammonium polyphosphate (APP) and pentaerythritol (PER), the thermal degradation and combustion behaviors of the flame retardant PE-based composites were investigated to reveal the flame retardant mechanism between CLDH and IFR in PE. The reactions between CLDH and IFR were revealed to make a predominant contribution to the compact and fully developed char of PE/IFR/CLDH, which enhanced the flame retardancy of the composites.
层状双氢氧化物（LDHs）的阻燃性与其结构以及在聚合物基体中的分散性相关。为提高Mg-Al LDH在聚乙烯（PE）中的阻燃效果，采用2-羧基乙基（苯基）次膦酸（CEPPA）作为阻燃改性剂，通过再生法制备了CEPPA插层LDH（CLDH），然后将其以由溶液混合制备的母粒形式通过熔融共混在PE中剥离。通过将CLDH与由聚磷酸铵（APP）和季戊四醇（PER）组成的膨胀型阻燃剂（IFR）复合，研究了阻燃PE基复合材料的热降解和燃烧行为，以揭示CLDH与IFR在PE中的阻燃机理。结果表明，CLDH与IFR之间的反应对PE/IFR/CLDH致密且充分发展的炭层起主要作用，从而提高了复合材料的阻燃性。
