TGA analysis of polypropylene-carbon nanofibers composites
TGA analysis of polypropylene-carbon nanofibers composites
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DOI：
10.1016/j.polymdegradstab.2008.01.001
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发表时间：
2008-04-01
影响因子：
5.9
通讯作者：
Chipara, Mircea
中科院分区：
文献类型：
--
作者：
Chipara, Magdalena;Lozano, Karen;Chipara, Mircea
采用热重分析法研究了等规聚丙烯-气相生长碳纳米纤维复合材料在氮气中的热降解。聚丙烯和负载有碳纳米纤维的聚丙烯的质量演化作为温度的函数是单S形。这些S形的拐点温度随着碳纳米纤维浓度的增加而增加。随着碳纳米纤维浓度的增加，降解过程的宽度变窄，这是由于碳纳米纤维的高导热性提供的局部温度的更好的均匀化。热重分析数据表明聚合物-碳纳米管界面的形成。基于热重分析数据，提出了碳纳米纤维-聚丙烯界面的双层结构。外层是软的，并且具有约10（2）nm的厚度，其限制大多数聚合物分子与纳米纤维相互作用。芯层是刚性的，并且具有几纳米量级的厚度。(c)2008爱思唯尔有限公司保留所有权利。
TGA investigations on the thermal degradation of isotactic polypropylene-vapor grown carbon nanofibers composites in nitrogen are reported. The mass evolution as a function of temperature is a single sigmoid for both polypropylene and polypropylene loaded with carbon nanofibers. The inflection temperature of these sigmoids increases as the concentration of carbon nanofibers is increased. The width of the degradation process narrows as the concentration of carbon nanofibers is increased due to a better homogenization of the local temperature provided by the high thermal conductivity of carbon nanofibers. Thermogravimetric analysis data indicate the formation of polymer-carbon nanofiber interface. Based on TGA data, a two-layer structure is proposed for carbon nanofibers-polypropylene interface. The external layer is soft and has a thickness of about 10(2) nm that confines most polymer molecules in interaction with nanofibers. The core layer is rigid and has a thickness of the order of few nanometers. (c) 2008 Elsevier Ltd. All rights reserved.