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首页> 外文期刊>Journal of Applied Polymer Science >Flame-retardant mechanism of silica: Effects of resin molecular weight
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Flame-retardant mechanism of silica: Effects of resin molecular weight

机译：二氧化硅的阻燃机理：树脂分子量的影响

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The effects of resin molecular weight on the flame-retardant mechanism of silica were studied with two different molecular weights of poly(methyl methacrylate) (PMMA), 122,000 and 996,000 g/mol, and two silicas, fused silica with a small surface area and silica gel with a large surface area. A total of six different samples were studied, with a mass fraction of 10% silica. The mass loss rate of the six samples in nitrogen and the heat release rate from burning in air were measured at an external radiant flux of 40 kW/m(2). The addition of silica gel to the low-molecular-weight PMMA significantly reduced the mass loss rate and heat release rate; addition to the high-molecular-weight PMMA provided the largest reductions of these quantities in this study. For fused silica, some reduction in mass loss rate and heat release rate was observed when it was added to the high-molecular-weight PMMA; addition to the low-molecular-weight PMMA did not reduce either loss rate. Chemical analysis of the collected residues and observation of the sample surface during gasification reveal the accumulation of silica near the surface; the larger its coverage over the sample surface was, less the mass loss rate and heat release rate were. Both the level of accumulation and its surface coverage depended strongly not only on the silica characteristics but also on the melt viscosity of the PMMA. (C) 2002 Wiley Periodicals, Inc. [References: 15]
机译：研究了两种不同分子量的聚甲基丙烯酸甲酯（PMMA）的分子量分别为122,000和996,000 g / mol，以及两种二氧化硅，小表面积和熔融二氧化硅的熔融二氧化硅，研究了树脂分子量对二氧化硅阻燃机理的影响。表面积大的硅胶。共研究了六个不同样品，质量分数为10％的二氧化硅。在40 kW / m的外部辐射通量下测量了六个样品在氮气中的质量损失率和在空气中燃烧产生的放热率。在低分子量PMMA中添加硅胶可显着降低质量损失率和放热率。在这项研究中，除了高分子量PMMA以外，这些数量的减少幅度最大。对于熔融二氧化硅，当将其添加到高分子量PMMA中时，观察到质量损失率和放热率有所降低。除了低分子量的PMMA以外，这两种方法都没有降低任何损失率。气化过程中对收集到的残留物进行化学分析并观察样品表面，发现二氧化硅在表面附近积累。其在样品表面上的覆盖范围越大，质量损失率和放热率越小。累积水平及其表面覆盖率不仅强烈取决于二氧化硅的特性，而且还取决于PMMA的熔体粘度。 （C）2002 Wiley Periodicals，Inc. [参考：15]

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