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首页> 外文会议>49th International wood composites symposium >5. Preparation and characterization of beta-cyclodextrin microencapsulated ammonium polyphosphate and its application in wood-flour/polypropylene composites
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5. Preparation and characterization of beta-cyclodextrin microencapsulated ammonium polyphosphate and its application in wood-flour/polypropylene composites

机译：5.β-环糊精微囊化聚磷酸铵的制备，表征及其在木粉/聚丙烯复合材料中的应用

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摘要

Ammonium polyphosphate (APP) is an effective and frequently used flame retardant for wood-plastic composites (WPCs), but its hydrophilicity and poor compatibility with the polymer matrix poses negative effects on the water resistance and mechanical properties of WPCs. In our research, beta-cyclodextrin (β-CD), a biobased product containing carbon source, was cross-linked by polydiphenylmethane diisocyanate (PMDI) and used as a coating to prepare microencapsulated APP (MCAPP) via polymerization in situ. The products were characterized by Fourier transform infrared spectroscopy (FTIR), X-ray photoelectron spectroscopy, scanning electron microscopy, water solubility tests, water contact angle, and thermogravimetric analysis. The tests indicated that APP was successfully coated by the cross-linked β-CD, resulting in MCAPP with low water solubility and excellent surface hydrophobicity outperformed the APP specimens. After modification by MCAPP, the flame retardancy of WPCs was investigated by limiting oxygen index (LOI) and cone calorimetry tests. The results showed that WPC/MCAPP had higher LOI value, lower heat release rate, and more char residues at the end of cone calorimetry tests than WPC/APP, indicating that WPC/MCAPP performed better flame retardancy than WPC/APP. Moreover, laser Raman spectroscopy and real-time FTIR were used to explore the flame retardant mechanism. In addition, all measured mechanical properties of WPC/MCAPP were also improved compared to the WPC/APP specimens, especially the impact strength.
机译：聚磷酸铵（APP）是一种有效且经常用于木塑复合材料（WPC）的阻燃剂，但其亲水性和与聚合物基体的不良相容性对WPC的耐水性和机械性能造成负面影响。在我们的研究中，含碳源的生物基产品β-环糊精（β-CD）通过聚二苯甲烷二异氰酸酯（PMDI）交联，并用作涂料通过原位聚合制备微囊化APP（MCAPP）。通过傅里叶变换红外光谱（FTIR），X射线光电子能谱，扫描电子显微镜，水溶性测试，水接触角和热重分析对产品进行了表征。测试表明，APP被交联的β-CD成功包覆，导致MCAPP的低水溶性和优异的表面疏水性优于APP试样。在通过MCAPP改性后，通过极限氧指数（LOI）和锥形量热法测试了WPC的阻燃性。结果表明，在锥形量热法测试结束时，WPC / MCAPP的LOI值更高，放热速率更低，残炭更多，这表明WPC / MCAPP的阻燃性比WPC / APP好。此外，利用激光拉曼光谱和实时FTIR来研究阻燃机理。此外，与WPC / APP试样相比，WPC / MCAPP的所有测得的机械性能也得到了改善，特别是冲击强度。

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  • 会议地点 Seattle WA(US)
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    Wen Wang; Wei Zhang; Jianzhang Li;

  • 作者单位

    MOE Key Laboratory of Wooden Material Science and Application, Beijing Key Laboratory of Wood Science and Engineering, Beijing Forestry University;

    MOE Key Laboratory of Wooden Material Science and Application, Beijing Key Laboratory of Wood Science and Engineering, Beijing Forestry University;

    Executive Vice-Dean of School of Materials Science and Technology, MOE Key Laboratory of Wooden Material Science and Application, Beijing Key Laboratory of Wood Science and Engineering, Beijing Forestry University;

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