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林产化学与工业 ›› 2020, Vol. 40 ›› Issue (1): 31-36.doi: 10.3969/j.issn.0253-2417.2020.01.005

• 研究报告 • 上一篇    下一篇

长链酰胺化纳米纤维素增强聚乳酸复合材料

宋庭方1,麦泳贤1,田秀枝1,邓海波1,蒋学1,2,*()   

  1. 1. 江南大学 生态纺织教育部重点实验室, 江苏 无锡 214122
    2. 华南理工大学制浆造纸工程国家重点实验室, 广东 广州 510640
  • 收稿日期:2019-07-01 出版日期:2020-02-28 发布日期:2020-03-06
  • 通讯作者: 蒋学 E-mail:jiangx@jiangnan.edu.cn
  • 作者简介:宋庭方(1995—),男,湖南郴州人,硕士生,主要从事纳米纤维素改性研究工作
  • 基金资助:
    国家自然科学基金资助项目(31570578);制浆造纸工程国家重点实验室开放基金资助项目(201809)

Poly (Lactic Acid) Composite Strengthened with Long-chain Amidated Nanocellulose

Tingfang SONG1,Yongxian MAI1,Xiuzhi TIAN1,Haibo DENG1,Xue JIANG1,2,*()   

  1. 1. Key Laboratory of Eco-Textile Ministry of Education, Jiangnan University, Wuxi 214122, China
    2. State Key Laboratory of Pulp and Paper Engineering, South China University of Technology, Guangzhou 510640, China
  • Received:2019-07-01 Online:2020-02-28 Published:2020-03-06
  • Contact: Xue JIANG E-mail:jiangx@jiangnan.edu.cn
  • Supported by:
    国家自然科学基金资助项目(31570578);制浆造纸工程国家重点实验室开放基金资助项目(201809)

摘要:

以纳米纤维素(NCC)为原料,先采用四甲基哌啶氮氧化物(TEMPO)氧化制备氧化纳米纤维素(TONC),再与不同链长脂肪胺在催化剂作用下发生反应,得到脂肪胺改性纳米纤维素,当脂肪胺为十二胺(DOA)、十四胺(TEA)、十六胺(HEA)、十八胺(OCA)时,分别制得DOATONC、TEATONC、HEATONC和OCATONC。傅里叶变换红外光谱(FT-IR)、X射线衍射(XRD)和元素分析表明:脂肪链接枝成功,改性后纳米纤维素的晶形没有发生改变,为原有Ⅰ型晶型;接触角和分散性测试表明:随着脂肪链的增长,改性纳米纤维素表面的亲水性明显下降(接触角由65.8°上升至93.9°),而分散率由25.17%先降至11.97%,再升至71.71%。将1%的改性纳米纤维素添加到聚乳酸(PLA)中制得复合膜,机械性能测试结果表明:随着脂肪链的增长,复合膜的机械性能明显提高,其中PLA/OCATONC复合膜的拉伸强度和断裂伸长率分别达到40.2 MPa和6.39%。

关键词: 聚乳酸, 纳米纤维素, 复合材料, 脂肪胺

Abstract:

Nano-cellulose (NCC) was used as raw material to prepare oxidized nanocellulose (TONC) by TEMPO reagent, and then TONC reacted with fatty amines that had different chain lengths under the action of catalyst to obtain fatty amine modified nanocellulose, which were prepared from octadecylamine (OCA) and named as DOATONC, TEATONC, HEATONC and OCATONC prepared from dodecylamine (DOA), tetradecylamine (TEA), hexadecylamine (HEA), respectively. Fourier transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD) and elemental analysis showed that the aliphatic chain was successfully grafted, and the crystal form. of the modified nanocellulose did not change, which was the original type I crystal form. The angular and dispersibility tests showed that the hydrophilicity of the surface of the modified nanocellulose decreased significantly with the increase of the aliphatic chain length associated with the increment of contact angle from 65.8° to 93.9°. The dispersion decreased first and then increased, which was reflected by that the dispersion rate was 25.17% first fell to 11.97% and then rose to 71.71%. The composite membrane was prepared by adding 1% modified nanocellulose to polylactic acid (PLA). The mechanical properties test results showed that the mechanical properties of the composite membrane were significantly improved with the increase of fat chain, among which tensile strength and elongation at break of PLA/OCATONC composite membrane reached 40.2 MPa and 6.39%, respectively.

Key words: polylactic acid, nanocellulose, composite, fatty amine

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