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Synthesis and properties of double methyl oleate terminated polysiloxane

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Abstract

Double methyl oleate (MO) capping agent (MO-MM-MO) was prepared by hydrosilylation, from MO and tetramethyldisiloxane (HMMH). The structure was characterized by IR spectrum. By investigating the effects of different catalysts and reaction conditions on the hydrosilylation conversion, the H2PtCl6·6H2O/isopropanol solutions was selected as catalyst, and the optimal reaction conditions were determined. The double MO-terminated polysiloxane (MOM-Dn-MMO) with different degree of polymerization (DP) was prepared via octamethylcyclotetrasiloxane (D4) ring opening polymerization, with MO-MM-MO terminated. The effects of DP on the performance of MOM-Dn-MMO were studied. With the increase in DP, the viscosity–temperature performance of product gradually increases, and it remained basically unchanged, when the DP was 60 or more. For the lubrication performance, as the DP increased, the product lubrication performance improved gradually, and compared with polydimethylsiloxane (M-Dn-M), the lubrication performance of MOM-Dn-MMO was also more excellent. The products with large DP had good thermal stability, also. In addition, the effects of product on the mineral oil performance were also investigated. The MOM-D40-MMO was good compatible with mineral oil, and the lubrication performance of mineral oil with MOM-D40-MMO was also improved, due to the presence of MO.

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Abbreviations

M-Dn-M:

Polydimethylsiloxane

MO:

Methyl oleate

MO-MM-MO:

Double methyl oleate capping agent

HMMH:

Tetramethyldisiloxane

MOM-Dn-MMO:

Double methyl oleate terminated polysiloxane

D4 :

Octamethylcyclotetrasiloxane

DP:

Degree of polymerization

VI:

Viscosity index

VTC:

Viscosity–temperature coefficient

WSD:

Wear scar diameter

TGA:

Thermal gravimetric analyzer

IR:

Infrared

ST:

Surface tension

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Authors and Affiliations

  1. College of Chemical Engineering, Nanjing Tech University, Nanjing, 210009, China

    Chunda Ji, Xiao Chen, Fengfu Li & Zhi Yun

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  1. Chunda Ji
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  2. Xiao Chen
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  3. Fengfu Li
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  4. Zhi Yun
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Correspondence to Zhi Yun.

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Ji, C., Chen, X., Li, F. et al. Synthesis and properties of double methyl oleate terminated polysiloxane. Polym. Bull. 76, 1807–1824 (2019). https://doi.org/10.1007/s00289-018-2473-0

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