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    李佳, 许志美, 奚桢浩, 赵玲. 棉籽油基聚氨酯弹性体的合成及性能[J]. 功能高分子学报, 2020, 33(6): 563-569. doi: 10.14133/j.cnki.1008-9357.20200301001
    引用本文: 李佳, 许志美, 奚桢浩, 赵玲. 棉籽油基聚氨酯弹性体的合成及性能[J]. 功能高分子学报, 2020, 33(6): 563-569. doi: 10.14133/j.cnki.1008-9357.20200301001
    LI Jia, XU Zhimei, XI Zhenhao, ZHAO Ling. Synthesis and Properties of Cottonseed Oil-Based Polyurethane Elastomer[J]. Journal of Functional Polymers, 2020, 33(6): 563-569. doi: 10.14133/j.cnki.1008-9357.20200301001
    Citation: LI Jia, XU Zhimei, XI Zhenhao, ZHAO Ling. Synthesis and Properties of Cottonseed Oil-Based Polyurethane Elastomer[J]. Journal of Functional Polymers, 2020, 33(6): 563-569. doi: 10.14133/j.cnki.1008-9357.20200301001

    棉籽油基聚氨酯弹性体的合成及性能

    Synthesis and Properties of Cottonseed Oil-Based Polyurethane Elastomer

    • 摘要: 生物基聚氨酯是高端生物材料领域的重要研究方向。采用臭氧化棉籽油基多元醇(OTO-polyols)和蓖麻油(CO)为原料,与异佛尔酮二异氰酸酯(IPDI)反应合成了一系列棉籽油基聚氨酯(TO-PU)弹性体。利用红外光谱(FT-IR)解析了聚氨酯弹性体的链结构,通过差示扫描量热仪、万能试验机和热重分析仪分别研究了材料的热行为、力学性能及热稳定性。结果表明:所合成的棉籽油基聚氨酯具有较低的玻璃化转变温度(−35~−28 ℃)和一定的结晶性能;通过调节软段棉籽油基多元醇与蓖麻油的质量比可以调控TO-PU的力学性能,其拉伸强度可超过2.50 MPa,断裂伸长率大于150%;棉籽油基聚氨酯的起始分解温度高于240 ℃,热稳定性良好。

       

      Abstract: Bio-based polyurethane with good comprehensive performance has attracted increasing attention. Cottonseed oil-based polyurethane (TO-PU) elastomers were synthesized from ozonized cottonseed oil-based polyols (OTO-polyols) with high hydroxyl value and castor oil (CO) by reacting with isophorone diisocyanate (IPDI). The structure of urethane bond was analyzed by Fourier transform infrared spectroscopy (FT-IR), and the formation of hydrogen bond was observed. The thermo-mechanical properties of synthetic TO-PU were examined by differential scanning calorimeter , thermogravimetric analyzer and universal testing. The thermo-mechanical properties are strongly dependent on the crosslinking density of TO-PU. The glass transition temperatures of polyurethane elastomers are −35 — −28 ℃, and the crystalline properties can be enhanced with the increase of castor oil. Correspondingly, the mechanical properties of TO-PU according to the tensile behavior of elastomers can be adjusted by turning the mass ratio of OTO-polyols to CO. The tensile strength of TO-PU-3 (m(OTO-polyols):m(CO)=7:3) exceeded 2.50 MPa, while the elongation at break can maintain above 150%. In comparison, the elongation at break of TO-PU-1 (m(OTO-polyols):m(CO)=9:1) can approach 400% by reducing the content of castor oil. The cottonseed oil-based polyurethane elastomer shows excellent thermal stability with the initial decomposition temperature above 240 ℃, and its three thermal degradation stages are caused by urethane groups, ester groups, and long carbon chains of polyols, respectively.

       

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