纳米柠檬酸锌对聚乳酸挤出发泡行为的影响
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Effect of Nano-Zinc Citrate on Extrusion-Foaming Behavior of Polylactic Acid
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    摘要:

    采用超临界二氧化碳(SC-CO2)连续挤出发泡方法,研究了纳米柠檬酸锌(NZnC)对聚乳酸(PLA)发泡行为的影响。首先,采用差示扫描量热仪(DSC)、扫描电子显微镜(SEM)和压缩试验机分别研究了纳米柠檬酸锌(NZnC)、食品级柠檬酸锌(FZnC)、纳米二氧化硅(N-SiO2)、癸二酸二苯基二酰肼(TMC-300)和滑石粉(Talc) 5 种成核剂对PLA 等温结晶行为、成核剂/PLA 复合材料的微观形貌、PLA 泡沫发泡性能及压缩性能的影响。结果表明,NZnC 的PLA 等温结晶速率最快、在PLA 中分散性及相容性最佳、PLA 泡沫发泡性能及压缩性能改性效果最好。继而,研究了NZnC 含量对PLA 泡沫发泡性能及压缩性能的影响,其结果表明,NZnC 质量分数为0.5%时,PLA 泡沫的发泡性能最好(发泡倍率为31 倍、泡孔密度为3.02×109 cm-3、平均泡孔直径为17.11 μm),压缩性能也最好(压缩模量为19 MPa、压缩强度为0.35 MPa)。

    Abstract:

    The effects of nano- zinc citrate (NZnC) on the foaming behaviors of polylactic acid(PLA) were investigated in continuous extrusion foaming with supercritical CO2 as blowing agent. First, the effects of five nucleating agents (nano zinc citrate(NZnC), food grade zinc citrate(FZnC), nano silica(N-SiO2), diphenyl sebacic acid dihydrazide(TMC-300) and talc) on the isothermal crystallization behavior of PLA, micro-morphologies of nucleating agent/PLA composites, foaming performance and compression performance of PLA foam were studied by differentialscanning calorimeter(DSC), scanning electron microscope(SEM) and compression testing machine. The results show that NZnC has the fastest isothermal crystallization rate of PLA, the best dispersibility and compatibility in PLA, and the best modification effect of foaming performance and compression performance of PLA foam. And then, the effects of NZnC content on the foaming performance and compression performance of PLA foam were studied. The results show that when the NZnC mass fraction is 0.5%, the PLA foam has the best foaming performance (the foaming ratio is 31 times, the cell density is 3.02×109 cm- 3, and the average cell diameter is 17.11 μm), and the compression performance is also the best (the compressive modulus is 19 MPa, the compressive strength is 0.35 MPa).

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周刚,刘文俊,黄承哲,尹海燕.纳米柠檬酸锌对聚乳酸挤出发泡行为的影响[J].高分子材料科学与工程,2022,38(9):103-109.

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  • 在线发布日期: 2022-11-23
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