Release Rates of Condensables and Total Volatiles from Rapid Devolatilization of Polyethylene and Polystyrene*†a,b
Release Rates of Condensables and Total Volatiles from Rapid Devolatilization of Polyethylene and Polystyrene*†a,b
复制标题
聚乙烯和聚苯乙烯快速脱挥发分的冷凝物和总挥发物的释放速率*†a,b
DOI：
10.1080/00102209008951692
复制
发表时间：
1990
影响因子：
1.9
通讯作者：
W. Peters
中科院分区：
文献类型：
--
作者：
George S. Darivakis;J. Howard;W. Peters
本文研究了63-90μm聚乙烯（PE）或聚苯乙烯（PS）粉末的批量样品（约10 mg）在氦气中以1000°C/s的速度快速加热热解（标称压力Iatm），从室温到400 - 800°C之间的规定最终（峰值）温度，然后通过辐射和自由对流自然冷却衬底，或通过用冷氮气淹没强制冷却，立即被煽动起来。总挥发物（总重量损失）和“可冷凝物”（焦油+较高分子量的可挥发材料）的产率各自通过重量分析法测量峰值温度的系统变化。初始粒径的影响（63-90 μ m粉末和10 - 240 μ m厚的片材用于PE; 63-90 μ m。180-250和500-710 ;μm粉末的PS），PS分子量（2100和850，000 d），和PE愈合速率（100，10，000 °C/s，强制冷却）也进行了测量。在1000°C/s下。63-90 μm的PE或PS颗粒在0.7- 0.8s内挥发率接近100%。重量损失和可冷凝物产量下降。
Abstract Batch samples (∼ 10mg) of 63-90μm polyethylene (PE) or polystyrene (PS) powders were rapidly pyrolyzed by healing at 1000°C/s, under helium (nominal pressure I atm), from room temperature to prescribed final (peak) temperatures between 400 and 800°C, whereupon natural cooling of the substrate by radiation and free convection, or forced cooling by inundation with cold nitrogen, was immediately instigated. Yields of total volatiles (total weight loss) and of “condensables” (tars + higher molecular weight volatilizable material) were each measured gravimelrically for systematic variations in peak temperature. Effects of initial particle size (63-90/vm powders and ∼-240jim thick sheets for PE; 63-90. 180-250, and 500-710 ;μm powders for PS), of PS molecular weight (2100 and 850,000 d), and of PE healing rate (100, 10,000°C/s with forced cooling) were also measured. At 1000°C/s. volatilization of 63-90/μm PE or PS particles approached 100% in about 0.7-0.8 s. Weight loss and condensables yields declin...