Willberg-Keyriläinen Pia, Orelma Hannes, Ropponen Jarmo
VTT Technical Research Centre of Finland Ltd., Tietotie 4E, P.O. Box 1000, FI-02044 VTT, FI-02150 Espoo, Finland.
Materials (Basel). 2018 Nov 23;11(12):2358. doi: 10.3390/ma11122358.
Interest in biobased polymers from renewable resources has grown in recent years due to environmental concerns, but they still have a minimal fraction of the total global market. In this study, the injection molding of thermoplastic cellulose octanate (cellulose C8) and cellulose palmitate (cellulose C16) were studied. The mechanical properties of injection-molded test specimens were analyzed by using tensile testing, and the internal structure of injection-molded objects was studied by using a field emission scanning electron microscopy (FE-SEM). We showed that thermoplastic cellulose C8 and cellulose C16 were completely processable without the addition of a plasticizer, which is very unusual in the case of cellulose esters. The compatibility of cellulose esters with poly(lactic acid) (PLA) and biopolyethylene (bio-PE) was also tested. By compounding the cellulose esters with PLA, the elongation of PLA-based blends could be improved and the density could be reduced. The tested thermoplastic cellulose materials were fully biobased, and have good future potential to be used in injection molding applications.
近年来，出于对环境问题的关注，人们对源自可再生资源的生物基聚合物的兴趣有所增加，但它们在全球市场总量中所占份额仍然极小。在本研究中，对热塑性辛酸纤维素（纤维素C8）和棕榈酸纤维素（纤维素C16）的注塑成型进行了研究。通过拉伸试验分析注塑测试样品的机械性能，并使用场发射扫描电子显微镜（FE-SEM）研究注塑制品的内部结构。我们发现，热塑性纤维素C8和纤维素C16在不添加增塑剂的情况下完全可加工，这在纤维素酯的情况下是非常不寻常的。还测试了纤维素酯与聚乳酸（PLA）和生物聚乙烯（bio-PE）的相容性。通过将纤维素酯与PLA共混，可以提高基于PLA的共混物的伸长率并降低密度。所测试的热塑性纤维素材料完全基于生物基，在注塑应用中具有良好的未来应用潜力。
