摘要
为明确改性剂用量对复合材料力学和热学性能的影响,以化学机械法制备的高长径比毛竹竹原纤维为增强相,采用γ-氨丙基三乙氧基硅烷(KH550)为偶联剂,热压制备45%竹原纤维/高密度聚乙烯(HDPE)复合材料,用环境扫描电镜(ESEM)、傅里叶红外光谱仪(FTIR)、X射线光谱仪(XPS)、X射线衍射仪(XRD)对改性竹原纤维和复合材料进行界面分析。结果表明,随着KH550用量增加,复合材料的力学强度呈现先增强后减弱的趋势,当KH550用量为1%时,复合材料的力学性能较佳,与未改性的复合材料相比,其弯曲强度、弯曲模量、拉伸强度和冲击强度分别提高了13.8%、21.8%、28.1%和24.5%,但其热稳定性略微下降。ESEM、FTIR和XPS的分析结果表明,改性竹原纤维表面极性降低,KH550与竹原纤维的羟基发生化学反应,复合材料的界面相容性增强;改性后纤维的结晶度下降,纤维大分子链柔顺性增强,竹原纤维和塑料基体之间的界面结合增强,而改性复合材料的结晶度升高,刚性增强。
In order to improve the comprehensive utilization rate and added value of bamboo product,the 45%bamboo fibre reinforced high density polyethylene(HDPE)composites using moso bamboo fibre with length to diameter ratio of 285.7 prepared by chemical-mechanical methods as reinforce phase andγ-aminopropyltriethoxy silane(KH550)as coupling agent were prepared by hot press molding.The interface analysis of modified bamboo fiber and its composite was investigated by using environmental scanning electronic microscopy(ESEM),Fourier transform infrared spectroscopy(FTIR),X-ray photoelectron spectroscopy(XPS),and X-ray diffraction(XRD).The effects of the KH550 content on the mechanical and thermal properties of composites were also studied.The results showed that the composites mechanical strengths increased first and then decreased with an increase of KH550 amount,and the optimal dosage of KH550 was 1%,for the bending strength,bending modulus,tensile strength,and impact strength of the modified composite were enhanced by 13.8%,21.8%,28.1%,and 24.5%,respectively,compared with the untreated one;but the thermal stability slightly decreased.Combined with ESEM,FTIR and XPS results,it was manifested that the polarity of the modified bamboo fiber surface decreased,and KH550 reacted with the hydroxyl group of bamboo fiber,and thus the enhanced composite interfacial compatibility was observed.XRD results revealed that the crystallinity of the modified fiber decreased,and the mutual binding between the modified bamboo fiber and PE matrix increased due to the increased flexibility of the bamboo fiber macromolecular chain;while the crystallinity of the modified composite increased.
作者
周吓星
范宏玥
童文瑄
陈礼辉
ZHOU Xiaxing;FAN Hongyue;TONG Wenxuan;CHEN Lihui(College of Material Engineering,Fujian Agriculture and Forestry University,Fuzhou,Fujian 350002,China;National Forestry and Grassland Administration Key Laboratory of Plant Fiber Functional Materials,Fuzhou,Fujian 350002,China)
出处
《森林与环境学报》
CSCD
北大核心
2021年第6期659-666,共8页
Journal of Forest and Environment
基金
“十三五”国家重点研发计划项目(2019YFC1905903)
国家重点研发计划项目(2017YFD0600802)。
关键词
竹原纤维
竹纤维增强复合材料
界面改性
硅烷
聚乙烯
bamboo fiber
bamboo fiber reinforced composites
interface modification
silane
polyethylene
