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《工程塑料应用》 2023年第04期
DOI:10.3969/j.issn.1001-3539.2023.04.009
PET/SiO2 复合材料的发泡温度窗口研究
王新如12,庞永艳2,邵玮玮2,王智军2,严铭2,郑文革2
1. 宁波大学材料科学与化学工程学院,浙江宁波 315211; 2. 中国科学院宁波材料技术与工程研究所高分子与复合材料实验室,浙江宁波 315201 
Study on Foaming Temperature Window of PET/SiO2 Composites
Wang Xinru12, Pang Yongyan2 , Shao Weiwei2, Wang Zhijun2, Yan Ming2, Zheng Wenge2
1. School of Materials Science and Chemical Engineering,Ningbo University,Ningbo 315211,China; 2. Laboratory of Polymers and Composites,Ningbo Institute of Materials Technology and Engineering,Chinese Academy of Sciences,Ningbo 315201,China 
摘要:为研究纳米二氧化硅(SiO2)对聚对苯二甲酸乙二酯(PET)复合材料发泡温度窗口的影响规律,制备了不同 SiO2 含量的 PET 复合材料,并以二氧化碳为发泡剂,利用釜压发泡制备了 PET/SiO2 复合发泡材料 。然后,利用扫描电子显微镜研究了在不同温度下制备的 PET/SiO2 复合发泡材料的泡孔结构 ,并统计和计算出泡孔尺寸、泡孔密度和膨胀倍率,再结合泡孔结构和膨胀倍率 ,界定出不同 SiO2 含量的 PET 复合材料发泡温度的上下限,并得出发泡温度窗口,还研究了 PET/SiO2 复合发泡材料的光反射率 。 结果发现,SiO2 对 PET 复合材料具有显著的气泡异相成核作用,随2着 SiO2 添加量的增加 ,泡孔尺寸减小 、泡孔密度增大 、膨胀倍率先增大后减小;发泡温度上限先升高后降低 、下限升 高,使得发泡温度窗口先变宽后变窄 ,这与 SiO2 的气泡异相成核作用、对膨胀倍率的调节作用及对基体黏弹性的影响密切相关。 随着 SiO2 添加量的增加,PET 复合发泡材料的光反射率逐渐增大,这归因于泡孔尺寸逐渐减小、泡孔密度逐渐增大更有利于光的反射。 
Abstract:In order to study the effect of nano-silica (SiO2) on the foaming temperature window of poly (ethylene terephthalate) (PET) composites, PET composites with various contents of SiO2 were prepared, and PET/SiO2 composite foams were prepared via batch foaming process with carbon dioxide as foaming agent. Then, the cell structure of PET/SiO2 composite foaming materials prepared at different temperatures was studied by scanning electron microscopy, and the cell size, cell density and expansion ratio were obtained. Combined with the cell structure and expansion ratio, the upper and lower limits of foaming temperature of PET composites with different SiO2 contents were defined, and the foaming temperature window was obtained. The light reflectivity of PET/SiO2 composite foam was also studied The results show that SiO2 has prominent heterogeneous nucleation effect on PET/SiO2 composites. With the increase of SiO2 content, the cell size decreases, the cell density increases, and the expansion ratio increases first and then decreases. The upper foaming temperature limit first increases and then decreases, and the lower limit increases, leading to the foaming temperature window first broadens and then narrows. These phenomena are closely related with the effect of SiO2 on heterogeneous cell nucleation, expansion ratio and viscoelasticity of PET composites. With the increasing of SiO2 content, the reflectivity of PET composite foams gradually increases. This is attributed to the gradually decreases cell size and increases cell density being favorable for light reflection. 
关键词:聚对苯二甲酸乙二酯;纳米二氧化硅;发泡窗口;泡孔结构;光反射率 
Keywords:poly(ethylene terephthalate); nano silicon dioxide; foaming window; cell structure; light reflectivity 
基金:国家自然科学基金面上项目(52273047),浙江省重点研发计划(2021C01005) 
本文引用格式:
王新如,庞永艳,邵玮玮,等.PET/SiO2复合材料的发泡温度窗口研究[J].工程塑料应用,2023,51(4):57?62.
2Wang Xinru,Pang Yongyan,Shao Weiwei,et al. Study on foaming temperature window of PET/SiO2 composites[J]. Engineering Plastics Application,2023,51(4):57?62. 

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