Improving Wear Resistance of Ultrahigh Molecular Weight Polyethylene: Cross-linking versus Crystallinity

Jing-han Wu; Peng Dong; Zi-rui Wang; Ke Wang; Qin Zhang; Qiang Fu

doi:10.11777/j.issn1000-3304.2022.22420

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Improving Wear Resistance of Ultrahigh Molecular Weight Polyethylene: Cross-linking versus Crystallinity

Research Article | 更新时间：2024-01-18

- Improving Wear Resistance of Ultrahigh Molecular Weight Polyethylene: Cross-linking versus Crystallinity
- ACTA POLYMERICA SINICA Vol. 54, Issue 5, Pages: 622-630(2023)
- 作者机构：
  
  四川大学高分子科学与工程学院高分子材料工程国家重点实验室成都 610065
- 作者简介：
  
  Qiang Fu, E-mail:qiangfu@scu.edu.cn
- 基金信息：
- DOI：10.11777/j.issn1000-3304.2022.22420
  CLC：
- Published：20 May 2023，
  
  Published Online：22 February 2023，
  
  Received：05 December 2022，
  
  Accepted：31 January 2023
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吴敬寒,董澎,王子瑞等.提高超高分子量聚乙烯的耐磨性：交联与结晶[J].高分子学报,2023,54(05):622-630.

Wu Jing-han,Dong Peng,Wang Zi-rui,et al.Improving Wear Resistance of Ultrahigh Molecular Weight Polyethylene: Cross-linking versus Crystallinity[J].ACTA POLYMERICA SINICA,2023,54(05):622-630.
吴敬寒,董澎,王子瑞等.提高超高分子量聚乙烯的耐磨性：交联与结晶[J].高分子学报,2023,54(05):622-630. DOI： 10.11777/j.issn1000-3304.2022.22420.

Wu Jing-han,Dong Peng,Wang Zi-rui,et al.Improving Wear Resistance of Ultrahigh Molecular Weight Polyethylene: Cross-linking versus Crystallinity[J].ACTA POLYMERICA SINICA,2023,54(05):622-630. DOI： 10.11777/j.issn1000-3304.2022.22420.

摘要

耐磨性能是超高分子量聚乙烯(UHMWPE)制品的重要评价指标，其增强机理为在摩擦表面阻止分子链滑移和脱落. 改善耐磨性在本质上是形成有效的分子链整体网络. 对于人工关节用交联UHMWPE模塑料，辐照改性会残存有自由基，容易造成氧化降解，破坏长期耐久稳定性. 发展能够替代辐照交联的新方法，具有重要的现实意义. 在本文中，我们选用不同分子量(

)的原料树脂，通过改变结晶热历史实现结晶度(

)大范围调节，以及改变

辐照剂量调整交联密度(

). 测定了各种样品的体积磨损率，建立

、

与磨损率的关系. 研究发现，随着

、

增加，磨损率线性降低；更为重要的是，对于所有分子量的UHMWPE，通过增加结晶度能够使磨损率降至比传统辐照交联方法更低的水平. 利用高结晶度改善耐磨性，由于不会引起活性自由基，从根本上消除了氧化风险，具有明显的优势. 研究结果为发展新型的高耐磨人工关节用UHMWPE模塑料提供了一种新思路.

Abstract

Wear resistance is an important evaluation index of ultra-high molecular weight polyethylene (UHMWPE) products

and its strengthening mechanism is to prevent molecular chain from sliding and falling off on the friction surface. In essence

the improvement of wear resistance is to form an interaction network of molecular chains. For cross-linked UHMWPE molding materials used as artificial joints

radiation modification will induce free radicals

which is easy to cause oxidative degradation and damage the long-term durability. It is of great significance to develop new method that can replace irradiation cross-linking. In this paper

we choose raw resin with different molecular weights (

)

and adjust the crystallinity (

) in a large range by changing the crystallization thermal history

and adjust the cross-linking density (

) by changing the

radiation dose. The volume wear rates of various samples were measured

and the relationships between the wear rates and the values of

were established. It is found that the wear rate decreases linearly with the increase of

and

. More importantly

for each

of UHMWPE

increasing the crystallinity enables wear rate to reduce to a lower level than that of traditional irradiation crosslinking method. The introduction of high crystallinity to improve wear resistance has obvious advantages because it will not cause active free radicals

thus fundamentally eliminating the risk of oxidation. Our study provides a new idea to develop UHMWPE articles with superior wear-resistance for artificial joint field.

关键词

模塑料耐磨性结晶度交联分子量

Keywords

Molding materialWear resistanceCrystallinityCross-linkingMolecular weight

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