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首页> 外文期刊>Journal of Applied Polymer Science >Thermal and thermomechanical properties of biocomposites made from modified recycled cellulose and recycled polypropylene
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Thermal and thermomechanical properties of biocomposites made from modified recycled cellulose and recycled polypropylene

机译：由改性回收纤维素和回收聚丙烯制成的生物复合材料的热和热机械性能

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Residual cellulose fibers from the paper industry have been used as reinforcements in recycled polypropylene (PP) composites. The main obstacle to obtaining good properties with this biocomposite is deficiencies in the compatibility between the nonpolar matrices and the polar cellulose fibers used as reinforcements. The aim of this work was to improve the compatibilization between these cellulose fibers and the PP matrix with four different methods: modification by the addition of polypropylene-maleic anhydride copolymer (PPgMA) during the process of blending, preblending modification of the cellulose with a solution of PPgMA, modification of cellulose by silanes (vinyltrimethoxysilane), and acetylation of cellulose. Blends with all of the differently modified celluloses were prepared with the cellulose content varied up to 40%, and then all of the blends were subjected to thermal (differential scanning calorimetry and thermogravimetric analysis) and thermomechanical (dynamic mechanical thermal analysis) analyses. The results showed that the addition of cellulose fibers improved the thermomechanical behavior of the PP, increasing the value of the log of the dynamic modulus, and affected the thermal and thermooxidative behavior. Moreover, an advantage of the use of a recycled PP containing a small quantity of ethyl vinyl acetate (EVA) as a prime material in the composition was the enhancement of mechanical properties. The use of these methods for the modification of cellulose led to more desirable thermal and thermooxidative stabilities. (C) 2003 Wiley Periodicals, Inc. J Appl Polym Sci 89: 2353-2360, 2003. [References: 25]
机译：造纸工业中残留的纤维素纤维已用作再生聚丙烯（PP）复合材料的增强材料。用这种生物复合材料获得良好性能的主要障碍是非极性基质与用作增强剂的极性纤维素纤维之间的相容性不足。这项工作的目的是通过四种不同的方法来改善这些纤维素纤维与PP基体之间的相容性：在共混过程中通过添加聚丙烯-马来酸酐共聚物（PPgMA）进行改性，将纤维素与溶液进行预混合改性。 PPgMA的合成，硅烷（乙烯基三甲氧基硅烷）对纤维素的改性以及纤维素的乙酰化。制备具有所有不同改性的纤维素的共混物，其中纤维素含量变化高达40％，然后对所有共混物进行热分析（差示扫描量热法和热重分析）和热机械分析（动态机械热分析）。结果表明，添加纤维素纤维改善了聚丙烯的热机械性能，增加了动态模量的log值，并影响了热和热氧化性能。此外，在组合物中使用包含少量乙基乙酸乙烯酯（EVA）作为主要材料的再生PP的优点是提高了机械性能。这些方法用于纤维素的改性导致更期望的热和热氧化稳定性。 （C）2003 Wiley Periodicals，Inc. J Appl Polym Sci 89：2353-2360，2003。[参考：25]

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