Abstract:
In the present work, statistical analysis (16 processing conditions and 2 virgin unmodified samples) is performed to study the influence of antioxidants (AOs) during acrylonitrile-butadiene-styrene terpolymer (ABS) melt-blending (220 °C) on the degradation of the polybutadiene (PB) rich phase, the oxidation onset temperature (OOT), the oxidation peak temperature (OP), and the yellowing index (YI). Predictive equations are constructed, with a focus on three commercial AOs (two primary: Irganox 1076 and 245; and one secondary: Irgafos 168) and two commercial ABS types (mass- and emulsion-polymerized). Fourier transform infrared spectroscopy (FTIR) results indicate that the nitrile absorption peak at 2237 cm-1 is recommended as reference peak to identify chemical changes in the PB content. The melt processing of unmodified ABSs promotes a reduction in OOT and OP, and promotes an increase in the YI. ABS obtained by mass polymerization shows a higher thermal-oxidative stability. The addition of a primary AO increases the thermal-oxidative stability, whereas the secondary AO only increases OP. The addition of the two primary AOs has a synergetic effect resulting in higher OOT and OP values. Statistical analysis shows that OP data are influenced by all three AO types, but 0.2 m% of Irganox 1076 displays high potential in an industrial context.
摘要:
在目前的工作中,进行统计分析(16个加工条件和2个未改性样品),以研究丙烯腈-丁二烯-苯乙烯三元共聚物(ABS)熔融共混(220°C)过程中抗氧化剂(AOs)对聚丁二烯降解的影响(PB)富相,氧化起始温度(OOT),氧化峰温度(OP),和黄化指数(YI)。构建了预测方程,重点关注三种商业AOs(两种主要:Irganox1076和245;一种次要:Irgafos168)和两种商业ABS类型(质量和乳液聚合)。傅里叶变换红外光谱(FTIR)结果表明,在2237cm-1的腈吸收峰被推荐作为参考峰,以识别PB含量的化学变化。未改性ABS的熔融加工促进了OOT和OP的减少,并促进了YI的增加。通过本体聚合获得的ABS显示出更高的热氧化稳定性。初级AO的添加增加了热氧化稳定性,而继发性AO只会增加OP。两种主要AO的添加具有协同作用,导致更高的OOT和OP值。统计分析表明,OP数据受所有三种AO类型的影响,但0.2m%的Irganox1076在工业环境中显示出很高的潜力。