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首页> 外文期刊>Journal of Applied Polymer Science >Poly(lactide acid) Composites Reinforced with Fibers Obtained from Different Tissue Types of Picea sitchensis
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Poly(lactide acid) Composites Reinforced with Fibers Obtained from Different Tissue Types of Picea sitchensis

机译：不同组织类型云杉云母纤维增强的聚乳酸酸复合材料

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摘要

Wood fibers vary in their properties across species, across trees of the same species, and within single trees. This work takes advantage of wood fibers reinforcing poly(lactic acid) composites that originate from different tissue types of the species Sitka spruce (Picea sitchensis). Fibers were prepared with high temperature thermo-mechanical processing (TMP) from juvenile, mature, and compression wood tissues of Sitka spruce. Composites were made by solution casting with subsequent hot-pressing. Thermal as well as mechanical properties were determined using differential scanning calorimetry (DSC), dynamic mechanical analysis (DMA), and tensile testing. The obtained results showed that the chemical and physical properties of different tissue-type Sitka spruce fibers have significant effects on the thermal and mechanical properties of the Polylactic acid (PLA)/Sitka fiber composites. To increase interfacial compatibility between the hydrophilic fibers and the hydrophobic polymer matrix, the fibers were treated with vinyltrimethoxysilane (VTMO), while PLA was modified with 4,4-methylene diphenyl diisocyanate (MDI). It was found that PLA/Sitka composites treated with VTMO and MDI exhibited improved thermal and mechanical properties, compared to the unmodified control. The work also demonstrates that there is potential to improve biobased composites by utilizing the natural variability of wood fibers.
机译：木纤维的特性在不同物种之间，同一物种的树木之间以及单棵树木中都不同。这项工作利用了木纤维增强聚乳酸复合材料的优势，这些复合材料源自Sitka云杉（Picea sitchensis）物种的不同组织类型。纤维是用高温热机械加工（TMP）从Sitka云杉的幼小，成熟和压缩木材组织中制备的。通过溶液浇铸并随后进行热压来制造复合材料。使用差示扫描量热法（DSC），动态力学分析（DMA）和拉伸试验确定热性能和机械性能。所得结果表明，不同组织类型的Sitka云杉纤维的化学和物理性质对聚乳酸（PLA）/ Sitka纤维复合材料的热和机械性质具有重要影响。为了增加亲水性纤维和疏水性聚合物基质之间的界面相容性，纤维用乙烯基三甲氧基硅烷（VTMO）处理，而PLA用4,4-亚甲基二苯基二异氰酸酯（MDI）改性。发现与未改性的对照相比，用VTMO和MDI处理的PLA / Sitka复合材料表现出改善的热和机械性能。这项工作还表明，利用木纤维的自然变异性可以改善生物基复合材料。

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