扭矩流变测定法研究硬质PVC/木粉熔融性能

研究了扭矩流变仪中木粉含量、木材种类(软木和硬木)及粒度对硬质PVC/木粉复合材料熔融性能(熔融时间、熔融温度、熔融扭矩和熔融能)的影响。纯硬质PVC只有1个熔融峰,而PVC母体材料中加入木粉后会产生2个熔融峰。结果表明,增加木粉含量会使基本粒子间开始熔融时间、温度和能量明显增加,从而引起熔融扭矩的增加,与木粉种类无关;用木粉填充的硬质PVC应该在比纯树脂高的温度下加工;木材种类会影响复合材料的熔融性能,但软木和硬木之间确定不出一个明显的趋势;精细粒子的熔融速度比粗粒子快,需要的能量也较少。

Fusion characteristics of rigid PVC/wood-flour composites by torque rheometry

This study was aimed at examining the effects of wood flour contents, wood species （ softwood vs. hardwood）, and particle size on the fusion characteristics（ fusion time, fusion temperature, fusion torque and fusion energy） of rigid PVC/wood-flour composites in a torque rheometer. Neat rigid PVC exhibited one fusion peak,whereas the addition of wood flour into the PVC matrix led to two fusion peaks. When the wood flour content increased, it caused a significant increase in the time, temperature and energy at which fusion between the primary particles started ,thereby leading to increased fusion torque,irrespective of the wood flour species. These results implied that rigid PVC filled with wood flour must be preeessed at higher temperatures than neat resin. Although fusion characteristics of the composites were influenced by the wood species , a clear trend between softwood and hardwood species could not be established. However,finer particles fused more quickly and needed less energy than coarse ones.