基于超临界二氧化碳釜压发泡技术制备生物可降解共聚酯PBST发泡颗粒
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泉州师范学院化工与材料学院

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福建省重大科技计划(2020HZ06019);泉州市科技计划(2017CT001,2019C106);福建省自然科技计划(2020J05155);泉州师范学院引进人才科研启动经费(H19003,G16021)


Preparation of biodegradable copolyester PBST foamed particles based on supercritical carbon dioxide autoclave foaming technology
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    摘要:

    首次使用超临界二氧化碳釜压发泡技术制备了生物可降解聚丁二酸对苯二甲酸丁二醇共聚酯(简称PBST)发泡颗粒。1HNMR谱图分析结果表明PBST中丁二酸的摩尔含量是55 %,差示扫描量热仪的结果表明PBST的玻璃化温度和熔点分别是-16 ℃和118 ℃。热重结果表明PBST的分解温度是312 ℃。详细研究了渗透温度、渗透时间和渗透压力对PBST发泡颗粒密度和发泡倍率的影响。研究结果表明,当渗透温度从60 ℃增加到80 ℃,PBST发泡颗粒的密度逐渐降低,发泡倍率逐渐增大。PBST发泡颗粒放置1天后,密度会增加,发泡倍率会降低。继续增加放置时间至7天,密度和发泡倍率都保持不变;当渗透时间从1 h增加到2 h,PBST发泡颗粒的密度逐渐降低,发泡倍率逐渐增加。当渗透时间从2 h增加到3 h,PBST发泡颗粒的密度和发泡倍率保持不变;当渗透压力从10 MPa增加到12 MPa,PBST发泡颗粒的密度逐渐降低,发泡倍率逐渐增加;当渗透压力从12 MPa增加到14 MPa时,PBST发泡颗粒的密度和发泡倍率保持不变;PBST发泡颗粒的最佳渗透温度是70 ℃,渗透时间是2 h,渗透压力是12 MPa。扫描电镜结果显示PBST发泡颗粒的平均泡孔在10 μm左右。本工作可为PBST在绿色环保轻量化领域的应用提供实验依据和理论指导。

    Abstract:

    Biodegradable poly (butylene succinate terephthalate) copolyester PBST foamed particles were prepared by supercritical carbon dioxide autoclave foaming technology for the first time. 1HNMR spectrum analysis shows that the molar content of succinic acid in PBST is 55%. Differential scanning calorimetry result shows that the glass transition temperature and melting point of PBST are -16 ℃ and 118 ℃, respectively. Thermogravimetric result shows that the decomposition temperature of PBST is 312 ℃. The effects of permeation temperature, permeation time and permeation pressure on the density and the expansion ratio of PBST foamed particles were studied in detail. The result shows that when the permeation temperature increases from 60 ℃ to 80 ℃, the density of PBST foamed particles decreases and the expansion ratio increases. When PBST foamed particles were kept for 1 day, the density of PBST foamed particles increases and the expansion ratio of PBST foamed particles decreases. When the storage time was increased to 7 days, the density and expansion ratio remain unchanged; When the permeation time increased from 1 h to 2 h, the density of PBST foamed particles decreases and the expansion ratio increases; When the permeation time increased from 2 h to 3 h, the density and expansion ratio of PBST foamed particles remain unchanged; When the permeation pressure increased from 10 MPa to 12 MPa, the density of PBST foamed particles decreases and the expansion ratio increases; When the permeation pressure increases from 12 MPa to 14 MPa, the density and expansion ratio of PBST foamed particles remain unchanged. The optimum permeation temperature, permeation time and permeation pressure of PBST foamed particles are 70 ℃, 2 h, and 12 MPa, respectively. SEM result shows that the average pore size of PBST foamed particles is ca. 10 μm. This work can provide experimental basis and theoretical guidance for the application of PBST in the field of green environmental protection and lightweight.

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  • 收稿日期:2021-09-15
  • 最后修改日期:2021-12-26
  • 录用日期:2022-03-26
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