School of Renewable Natural Resources, Louisiana State University Agricultural Center, Baton Rouge, LA 70803, United States.
Bioresour Technol. 2010 May;101(10):3665-71. doi: 10.1016/j.biortech.2009.12.069. Epub 2010 Jan 25.
High-melting-temperature poly(ethylene terephthalate) (PET) was successfully introduced into wood plastic composites through a two-step reactive extrusion technology. Wood flour was added into pre-prepared PET/high density polyethylene (HDPE) microfibrillar blends (MFBs) in the second extrusion at the temperature for processing HDPE. Addition of 25% in situ formed PET microfibers obviously increased the mechanical properties of HDPE, and more significant enhancement by the in situ formed recycled PET microfibers was observed for the recycled HDPE. Adding 2% E-GMA improved the compatibility between matrix and microfibers in MFBs, resulting further enhanced mechanical properties. The subsequent addition of 40% wood flour did not influence the size and morphology of PET microfibers, and improved the comprehensive mechanical properties of MFBs. The wood flour increased the crystallinity level of HDPE in the compatibilized MFB in which PET phase did not crystallize. The storage modulus of MFB was greatly improved by wood flour.
采用两步法反应挤出技术，成功地将高熔点聚对苯二甲酸乙二醇酯（PET）引入木塑复合材料中。在第二次挤出过程中，将木粉加入到预先制备的 PET/高密度聚乙烯（HDPE）微纤化共混物（MFB）中，挤出温度为 HDPE 的加工温度。在原位形成的 25% PET 微纤维明显提高了 HDPE 的力学性能，而对于回收 HDPE，原位形成的回收 PET 微纤维的增强效果更为显著。添加 2%的 E-GMA 改善了 MFB 中基体与微纤维之间的相容性，从而进一步提高了力学性能。随后添加 40%的木粉不会影响 PET 微纤维的尺寸和形态，并且提高了 MFB 的综合力学性能。木粉增加了 PET 相不结晶的相容化 MFB 中 HDPE 的结晶度水平。木粉大大提高了 MFB 的储能模量。
