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Studies on the Lubrication between Hydrophilic-hydrophilic/ Hydrophobic-hydrophobic Gemini Interfaces and Complex Fluids
- Acta Polymerica Sinica Pages: 1-10(2024)
- 作者机构：
1.浙江科技大学环境与资源学院 杭州 310023
2.浙江大学高分子科学与工程学系 高分子功能构造与合成教育部重点实验室 杭州 310058
- 作者简介：
Lu Chen, E-mail: chenlu94@zju.edu.cn
Miao Du, E-mail: dumiao@zju.edu.cn
- 基金信息：
DOI：10.11777/j.issn1000-3304.2023.23263
CLC：-
Published Online：07 May 2024，
Received：15 November 2023，
Accepted：05 February 2024
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胡志军, 孙钟媛, 陈华, 陈璐, 杜淼, 宋义虎, 郑强. 亲-亲/疏-疏双子界面在复杂流体中润滑行为的研究. 高分子学报, doi: 10.11777/j.issn1000-3304.2023.23263
Hu, Z. J.; Sun, Z. Y.; Chen, H.; Chen, L.; Du, M.; Song, Y. H.; Zheng, Q. Studies on the lubrication between hydrophilic-hydrophilic/hydrophobic-hydrophobic gemini interfaces and complex fluids. Acta Polymerica Sinica, doi: 10.11777/j.issn1000-3304.2023.23263
胡志军, 孙钟媛, 陈华, 陈璐, 杜淼, 宋义虎, 郑强. 亲-亲/疏-疏双子界面在复杂流体中润滑行为的研究. 高分子学报, doi: 10.11777/j.issn1000-3304.2023.23263 DOI：
Hu, Z. J.; Sun, Z. Y.; Chen, H.; Chen, L.; Du, M.; Song, Y. H.; Zheng, Q. Studies on the lubrication between hydrophilic-hydrophilic/hydrophobic-hydrophobic gemini interfaces and complex fluids. Acta Polymerica Sinica, doi: 10.11777/j.issn1000-3304.2023.23263 DOI：
摘要
植入医用软材料摩擦行为对材料植入效果及副作用有决定性影响. 分别以临床常用聚二甲基硅氧烷(PDMS)弹性体及类生物组织材料聚丙烯酰胺(PAM)水凝胶为摩擦副，采用丙烯酸衍生聚合物(EMT-10)水分散液为摩擦介质，构建摩擦系统，研究摩擦曲线变化趋势及其影响因素. 结果显示，疏水PDMS弹性体对EMT-10聚合物具有较强的吸附作用，其润滑液层由摩擦界面吸附和受限空间束缚的EMT-10聚合物链共同构成. 与疏水PDMS弹性体相比，亲水PAM水凝胶与EMT-10聚合物链吸附作用弱，润滑液层由水凝胶表面本体网链和束缚EMT-10聚合物链组成. 相对液膜厚度参数可关联界面性质与润滑介质流变行为，判断摩擦系统所处摩擦曲线区域及变化趋势.
Abstract
The frictional behaviors of implant soft materials
in vivo
are important to medical effect. In this study
hydroxyethyl acrylate sodium/acryloyldimethyl taurate copolymer (EMT-10) aqueous dispersions are adopted
acting as lubricants in hydrophobic polydimethylsiloxane elastomer (PDMS) Gemini interfaces or hydrophilic polyamide hydrogel (PAM) Gemini interfaces
respectively. The associations exist in EMT-10 aqueous dispersions
via
hydrogen bonding
electrostatic and hydrophobic interactions
similar to bio-lubricants. The EMT-10 aqueous dispersions
surface characteristics of Gemini interfaces and the axial force (
N
a
) during frictional experiments in Stribeck curves are studied. Under low and high concentrations of EMT-10 lubricant
the PDMS Gemini interfaces exhibit opposing sensitivity to
N
a
different from the PAM Gemini interfaces
which always showing lower CoF at higher
N
a
. This phenomenon results from the various degree of perfection for lubrication film between the Gemini interfaces. To further distinguish the lubrication film formation
and correlate frictional surface characteristic and rheological behaviors of lubricant
a new parameter
relative thickness (
φ
)
is established. When
φ
<
1
the lubrication film is discrete
and the boundary lubrication regime plays dominant role during the frictional test. When
φ
>
1
the entire lubrication film forms and the whole system enters hydrodynamic lubrication regime. For PDMS Gemini interfaces
the lubrication film is composed of the confined and adsorbed EMT-10 polymer chains owing to the strong attraction between the hydrophobic surface and the C－C backbone. As a result
the lubrication film is greatly affected by the concentration of the lubricant thus
φ
increases. The PDMS frictional system gradually converts from the boundary into hydrodynamic lubrication regime. For PAM Gemini interfaces
the film is made of the hydrogel surface mesh and the confined EMT-10 chains
so
φ
is always larger than 1
exhibiting the characteristic of hydrodynamic lubrication regime. The study tends to probe the frictional behavior of the complex fluids in the soft Gemini interfaces and unveils the mechanism behind the phenomenon.
关键词
润滑双子界面硅橡胶水凝胶
Keywords
LubricationGemini interfacesPolydimethylsiloxane elastomerHydrogel
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