Synthesis and characterisation of HSIBR used as viscosity index improver for lubricants

Li, Wei; Li, Yang; Hu, Yanming; Wang, Yurong

doi:10.1002/ls.1174

Cited by 10 publications

(4 citation statements)

References 18 publications

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“…SIS copolymers were hydrogenated according to previous procedures [ 21 , 22 , 23 , 24 ] with some modifications. The hydrogenation process was conducted under an argon atmosphere, and all Schlenk flasks were filled with argon after high-temperature heating.…”

Section: Methodsmentioning

confidence: 99%

Studies of the Sulfonated Hydrogenated Styrene–Isoprene–Styrene Block Copolymer and Its Surface Properties, Cytotoxicity, and Platelet-Contacting Characteristics

et al. 2021

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Styrenic thermoplastic elastomers (TPEs) consist of styrenic blocks. They are connected with other soft segments by a covalent linkage and are widely used in human life. However, in biomedical applications, TPEs need to be chemically hydrogenated in advance to enhance their properties such as strong UV/ozone resistance and thermal-oxidative stability. In this study, films composed of sulfonated hydrogenated TPEs were evaluated. Hydrogenated tert-butyl styrene–styrene–isoprene block copolymers were synthesized and selectively sulfonated to different degrees by reaction with acetyl sulfate. By controlling the ratio of the hydrogenated tert-butyl styrene–styrene–isoprene block copolymer and acetyl sulfate, sulfonated films were optimized to demonstrate sufficient mechanical integrity in water as well as good biocompatibility. The thermal plastic sulfonated films were found to be free of cytotoxicity and platelet-compatible and could be potential candidates in biomedical film applications such as wound dressings.

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Section: Methodsmentioning

confidence: 99%

Studies of the Sulfonated Hydrogenated Styrene–Isoprene–Styrene Block Copolymer and Its Surface Properties, Cytotoxicity, and Platelet-Contacting Characteristics

et al. 2021

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“…The reaction scheme is shown in Figure 2. Following the previous studies [17][18][19][20][21], cyclohexane and 0.71 mL (1.34 mmol) cobalt (II) 2-ethyl hexanoate solution were purged with argon in a 100 mL flask for 30 min. Then, 4.8 mL (4.8 mmol) of triethyl-aluminum was added and the reaction was carried out under room temperature for 60 min.…”

Section: Hydrogenation Of Tsis Copolymermentioning

confidence: 99%

Sulfonation and Characterization of Tert-Butyl Styrene/Styrene/Isoprene Copolymer and Polypropylene Blends for Blood Compatibility Applications

et al. 2020

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Hydrogenated styrenic block copolymers (HSBCs) have been used in medical tubing for many years due to their high clarity, flexibility, kink resistance, and toughness. However, when it comes to blood storage applications, HSBC compounds’ market has been limited because of their high hydrophobicity, which may trigger platelet adhesion when contacting with blood. HSBC needs to be physically or chemically modified in advance to make it blood compatible; however, HSBC has strong UV/ozone resistance, thermooxidative stability, and excellent processing capability, which increases the difficulty of the chemical modification process as unsaturated dienes has been converted to saturated stable midblocks. Moreover, medical HSBC-containing compounds primarily make up with the non-polar, hydrophobic nature and benign characteristics of other common ingredients (U.S. Pharmacopeia (USP) grades of mineral oil and polypropylene), which complicates the realization of using HSBC-containing compounds in blood-contacting applications, and this explains why few studies had disclosed chemical modification for biocompatibility improvement on HSBC-containing compounds. Sulfonation has been reported as an effective way to improve the material’s blood/platelet compatibility. In this study, hydrogenated tert-butyl styrene (tBS)-styrene-isoprene block copolymers were synthesized and its blends with polypropylene and USP grades of mineral oil were selectively sulfonated by reaction with acetyl sulfate. By controlling the ratio of the hydrogenated tBS-styrene-isoprene block copolymer in the blend, sulfonated films were optimized to demonstrate sufficient physical integrity in water as well as thermal stability, hydrophilicity, and platelet compatibility.

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“…The larger the VI of lubricating oil, the better its performance. To obtain a better VI, VI improver (VII) was added in lubricating oil. VII can be regarded as the key to high performance multigrade oil .…”

Section: Introductionmentioning

confidence: 99%

Synthesis and characterization of polybutylacrylate viscosity index improver with anti‐wear function

Cai

Zhang

et al. 2014

Lubrication Science

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A new anti-wear polybutylacrylate viscosity index improver was prepared and evaluated for lube oil. First, RAFT polymerization of n-butyl acrylate was carried out, then the polymer intermediate was esterified with n-butanol, and finally, the polybutylacrylate was obtained. Molecular weight test showed that the Reversible Addition-Fragmentation Chain Transfer (RAFT) polymerization could obtain the expected molecular weight polymer by controlling the adding amount of RAFT agent. Rotary bomb oxidation test and thermogravimetric analysis demonstrated that this polybutylacrylate had excellent oxidation stability and thermal stability. Anti-wear test and shear stability test showed that the polybutylacrylate had good antiwear property and shear stability. The effects on trihydroxymethyl propane triheptanoate showed that this polybutylacrylate not only could improve the viscosity index but also could improve the anti-wear property of base oil. And the performance of this polybutylacrylate is affected by their molecular weight. Copyright

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Synthesis and characterisation of HSIBR used as viscosity index improver for lubricants

Cited by 10 publications

References 18 publications

Studies of the Sulfonated Hydrogenated Styrene–Isoprene–Styrene Block Copolymer and Its Surface Properties, Cytotoxicity, and Platelet-Contacting Characteristics

Studies of the Sulfonated Hydrogenated Styrene–Isoprene–Styrene Block Copolymer and Its Surface Properties, Cytotoxicity, and Platelet-Contacting Characteristics

Sulfonation and Characterization of Tert-Butyl Styrene/Styrene/Isoprene Copolymer and Polypropylene Blends for Blood Compatibility Applications

Synthesis and characterization of polybutylacrylate viscosity index improver with anti‐wear function

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