Influence of mono-lithium based initiators with different steric volumes on 1,4 unit content of hydroxyl terminated polybutadiene using anionic polymerization

Zhu, Xiuzhong; Fan, Xiaodong; Zhao, Na; Min, Xin; Liu, Jie; Wang, Zi-chao

doi:10.1039/c7ra11117g

Cited by 11 publications

(5 citation statements)

References 27 publications

(27 reference statements)

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“…It is well-known that the higher the content of cis -1,4 structure in the molecular chain of HTPB, the lower the T g and the better the low-temperature resistance (good mechanical properties in the low-temperature environment). , For example, the cis -1,4 structure in polybutadiene rubber prepared by coordination polymerization is as high as 98%, and its T g is as low as −108 °C, which is more than 40 °C lower than that of conventional HTPB. − Due to the limitation of the free radical polymerization reaction mechanism, the proportion of cis -1,4 structure in the molecular structure of conventional HTPB can only reach about 20%. , In order to further increase the content of cis -1,4 structure, researchers prepared HTPB by anionic polymerization, coordination polymerization, and ring-opening complex decomposition polymerization, respectively. − Unfortunately, these preparation methods not only require complex catalytic processes and high production costs but also the content of cis -1,4 structure is still difficult to reach more than 90%.…”

Section: Introductionmentioning

confidence: 99%

Preparation of Hydroxyl-Terminated Polybutadiene by the Pyrolysis Method and Its Application in Polyurethane

Meng,

Sang,

Chang

et al. 2024

ACS Appl. Polym. Mater.

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Hydroxyl-terminated polybutadiene with a high cis-1,4 content (cis-HTPB) was prepared by direct oxidative cracking of cis-polybutadiene rubber (BR-9000) with periodic acid (H 5 IO 6 ). The results showed that the cis-HTPB structure contained more than 95% of the cis-1,4 structure, and the glass transition temperature (T g ) was as low as −104.7 °C, exhibiting excellent low-temperature resistance. In addition, the optimal reaction conditions were determined by optimizing the preparation process to achieve efficient and controllable preparation of cis-HTPB. Finally, polyurethane elastomers were prepared based on cis-HTPB, and the mechanical properties of the elastomers were improved by optimizing the formulation design. The tensile strength of the elastomers was as high as 1.84 MPa and the elongation at break was 721%, which can meet the requirements of different applications. This study provides a simpler strategy for the oxidative degradation of cis-polybutadiene rubber to prepare high-value-added cis-HTPB and also provides experience for the functionalization of other types of polyolefin rubbers.

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Section: Introductionmentioning

confidence: 99%

Preparation of Hydroxyl-Terminated Polybutadiene by the Pyrolysis Method and Its Application in Polyurethane

Meng,

Sang,

Chang

et al. 2024

ACS Appl. Polym. Mater.

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“…It can be seen that the different microstructures of HTPB have a great influence on its own properties, and the mechanism of its influence may be explored through a reasonable molecular simulation [ 21 ]. At present, there are three main methods for the polymerization of HTPB, namely, free radical polymerization [ 22 , 23 ], anionic polymerization [ 24 , 25 , 26 ], and ring-opening metathesis polymerization (ROMP) [ 27 , 28 ]. In a previous study, our group reported in detail the differences in the structures and properties of HTPB prepared via the three polymerization methods.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and Comparative Study of Polyether-b-polybutadiene-b-polyether Triblock Copolymers for Use as Polyurethanes

Bi,

Zhu,

Han

et al. 2023

Polymers

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In this paper, the effects of HTPBs with different main-chain microstructures on their triblock copolymers and polyurethane properties were investigated. Three polyether-modified HTPB triblock copolymers were successfully synthesized via a cationic ring-opening copolymerization reaction using three HTPBs with different microstructures prepared via three different polymerization methods as the macromolecular chain transfer agents and tetrahydrofuran (THF) and propylene oxide (PO) as the copolymerization monomers. Finally, the corresponding polyurethane elastomers were prepared using the three triblock copolymers as soft segments and toluene diisocyanate (TDI) as hard segments. The results of an analysis of the triblock copolymers showed that the triblock copolymers had lower viscosity and glass transition temperature (Tg) values as the HTPB 1,2 structure content decreased, although the effect on the thermal decomposition temperature was not significant. An analysis of the polyurethane elastomers revealed that as the content of the 1,2 structure in HTPB increased, its corresponding polyurethane elastomers showed a gradual increase in breaking strength and a gradual decrease in elongation at break. In addition, PU-1 had stronger crystallization properties compared to PU-2 and PU-3. However, the differences in the microstructures of the HTPBs did not seem to have much effect on the surface properties of the polyurethane elastomers.

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“…[19] Telechelic polymers have special functional groups and can be prepared using anionic polymerization, which enables using functional SBR as the SS of polyurethane via anionic polymerization. [20] Benvenuta-Tapia et al [21] adjusted the T g of SBR from −60 to −15 °C by controlling the styrene content. Lee et al [22] successfully prepared block copolymers of styrene isoprene styrene (SIS) and styrene isoprene styrene (ISI) with different vinyl content by adjusting the reaction temperature and polarity-modifier dosage.…”

Section: Introductionmentioning

confidence: 99%

Controllable Design and Preparation of Hydroxyl‐Terminated Solution‐Polymerized Styrene Butadiene for Polyurethane Elastomers with High‐Damping Properties

Zhao

Shou

et al. 2022

Macromol. Rapid Commun.

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Vibration and noise are ubiquitous in social life, which severely damage machinery and adversely affect human health. Thus, the development of materials with high-damping performance is of great importance. Rubbers are typically used as damping materials because of their unique viscoelasticity. However, they do not satisfy the requirements of different applications with various working conditions. In this study, the advantages of the high loss factor of styrene butadiene rubber (SBR) are combined with the strong designability of polyurethane. Hydroxyl-terminated solution-polymerized styrene butadiene rubbers (HTSSBRs) with different structures are prepared using anionic polymerization. HTSSBRs are then used as the soft segment during the synthesis of temperature-tunable high-damping performance polyurethanes (HTSSBR-polyurethanes (PUs)). The prepared HTSSBR-PUs with different structures exhibit excellent loss performance, a maximum loss factor (tan 𝜹 max ) of above 1.60, and an effective damping performance over a wide temperature range compared to traditional SBR and polyurethane. Therefore, this work offers an effective method for the design of damping materials with adjustable properties.

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Influence of mono-lithium based initiators with different steric volumes on 1,4 unit content of hydroxyl terminated polybutadiene using anionic polymerization

Abstract: The influence of steric structural factors of mono-lithium based anionic initiators on 1,4 unit content of hydroxyl terminated polybutadiene was investigated.

Cited by 11 publications

References 27 publications

Preparation of Hydroxyl-Terminated Polybutadiene by the Pyrolysis Method and Its Application in Polyurethane

Preparation of Hydroxyl-Terminated Polybutadiene by the Pyrolysis Method and Its Application in Polyurethane

Synthesis and Comparative Study of Polyether-b-polybutadiene-b-polyether Triblock Copolymers for Use as Polyurethanes

Controllable Design and Preparation of Hydroxyl‐Terminated Solution‐Polymerized Styrene Butadiene for Polyurethane Elastomers with High‐Damping Properties

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