Studies on LLDPE functionalized by ultraviolet irradiation and mechanical properties of PA66/irradiated LLDPE blends

WU Shishan; CHEN Zhengnian; SHEN Jian

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Studies on LLDPE functionalized by ultraviolet irradiation and mechanical properties of PA66/irradiated LLDPE blends

Radiation Modification of Polymeric Materials | 更新时间：2023-03-30

- Studies on LLDPE functionalized by ultraviolet irradiation and mechanical properties of PA66/irradiated LLDPE blends
- Journal of Radiation Research and Radiation Processing Vol. 23, Issue 2, Pages: 115(2005)
- 作者机构：
  
  1.南京大学化学化工学院　南京　210093
  2.南京师范大学化学和环境科学学院　南京　210097
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WU Shishan, CHEN Zhengnian, SHEN Jian. Studies on LLDPE functionalized by ultraviolet irradiation and mechanical properties of PA66/irradiated LLDPE blends. [J]. Journal of Radiation Research and Radiation Processing 23(2):115(2005)
DOI：

WU Shishan, CHEN Zhengnian, SHEN Jian. Studies on LLDPE functionalized by ultraviolet irradiation and mechanical properties of PA66/irradiated LLDPE blends. [J]. Journal of Radiation Research and Radiation Processing 23(2):115(2005) DOI：

摘要

通过紫外辐照实现了高密度聚乙烯（HDPE）的官能化，改善了HDPE复合材料的性能,[1-3],。本工作采用傅立叶红外（FT-IR）、X射线光电子能谱（XPS）、凝胶、熔融指数和水接触角测试等研究了紫外辐照对线性低密度聚乙烯（LLDPE）化学结构和性能的影响。紫外辐照后，在LLDPE的分子链上引入了C=O、C-O和C（=O）O等含氧基团，其含量随辐照时间延长而增加。凝胶分析结果表明，紫外辐照过程中，LLDPE产生凝胶，其含量随辐照时间延长而明显增加。这说明LLDPE在官能化的同时还发生了交联反应。LLDPE的熔融指数（MI）随紫外辐照时间延长而下降，在辐照24 h时出现最小值。然后，随紫外辐照时间的进一步延长其熔融指数有所提高。由于辐照LLDPE的分子链上引入了C=O和C-O等含氧基团，它的极性增大，亲水性提高，因此水接触角变小。可以通过控制辐照时间来调节辐照官能化LLDPE的亲水性，进而调整、改善辐照官能化LLDPE与尼龙66（PA66）之间的相容性，从而制备力学性能良好的PA66/LLDPE共混物。力学性能测试结果表明，PA66/辐照官能化LLDPE共混物的力学性能明显优于PA66/LLDPE共混物。

Abstract

The effect of UV irradiation on the structure and properties of linear low-density polyethylene (LLDPE) and the mechanical properties of nylon 66 (PA66)/LLDPE blends were studied with FTIR and XPS, measurements of gel, melt index, and water contact angle, and mechanical property tests. The results show that oxygen-containing groups such as C-O, C=O and C (=O) O were introduced onto molecular chains of LLDPE by the UV irradiation in air without adding any additives. The content of these groups increased with irradiation time. Gel formation was found in LLDPE after 12 h UV irradiation, and the gel fraction increased with the irradiation time. Melt index and water contact angle of the irradiated LLDPE decreased. Due to the introduction of the oxygen-containing groups, interfacial interactions between PA66 and the irradiated LLDPE increased. Therefore mechanical properties of PA66/irradiated LLDPE blends were improved compared with PA66/LLDPE blend. Tensile strength and notch impact strength of the PA66/irradiated LLDPE blends increased with irradiation time.

关键词

线性低密度聚乙烯紫外辐照PA66/LLDPE共混物力学性能

Keywords

LLDPEUV irradiationPA66/LLDPE blendsMechanical properties

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