Effect of enthalpy of polar modifiers interaction with n-butyllithium on the reaction enthalpy, kinetics and chain microstructure during anionic polymerization of 1,3-butadiene

Kozak, Radosław; Matlengiewicz, Marek

doi:10.1016/j.polymertesting.2017.09.029

Cited by 7 publications

(9 citation statements)

References 40 publications

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“…where, γ max is the expected maximum strain (%) and A and B are the fatigue correlation coefficients, which are calculated according to Equation (11) to Equation (12). 11) where, f = 10 Hz, D f = (…”

Section: Fatigue Lifementioning

confidence: 99%

“…The above calculation results present the damage characteristic curves and fatigue life curves of eight kinds of asphalt (Figures 8 and 9). where, γ max is the expected maximum strain (%) and A and B are the fatigue correlation coefficients, which are calculated according to Equation (11) to Equation (12).…”

Section: Fatigue Lifementioning

confidence: 99%

“…SBSMA has been utilized extensively on national highways in China [9,10]. SBS is a block copolymer created from the anionic polymerization of 1,3-butadiene, styrene (monomer), tetrahydrofuran (activator), and n-butyllithium (initiator) in the cyclohexane solvent [11]. According to the different contents of polystyrene and polybutadiene, as well as the difference in the molecular structure, SBS can be divided into the linear and star structures, as shown in Figure 1 [12].…”

Section: Introductionmentioning

confidence: 99%

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Viscoelastic Behavior and Phase Structure of High-Content SBS-Modified Asphalt

et al. 2022

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To investigate the effect of styrene-butadiene-styrene (SBS) modifier content on the viscoelastic behavior of SBS-modified asphalt (SBSMA) at different temperatures and phase structures, the star SBS modifier was chosen to fabricate seven types of SBSMA with different contents. Multiple stress creep recovery (MSCR), linear amplitude sweep (LAS), and low-temperature frequency sweep tests were adopted to study the influence of SBS modifier content on the viscoelastic performance of SBSMA at high to low temperatures. The SBSMA’s microstructure with different contents was investigated using a fluorescence microscope. The results indicated that the change in non-recoverable creep compliance and creep recovery rate was bounded by 4.5% content at high temperatures, with an apparent turning point. The changing slope of content at less than 4.5% was much higher than that of the content greater than 4.5%. At medium temperatures, the fatigue life of SBSMA increased exponentially with the rising modifier content. The rate of increase in fatigue life was the largest as the content increased from 4.5% to 6.0%. At low temperatures, the low-temperature viscoelastic property index G (60 s) of SBSMA decreased logarithmically as the modifier content increased. In terms of the microscopic phase structure, the SBS modifier gradually changed from the dispersed to the continuous phase state with the increasing SBS modifier content.

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Section: Fatigue Lifementioning

confidence: 99%

Section: Fatigue Lifementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Viscoelastic Behavior and Phase Structure of High-Content SBS-Modified Asphalt

et al. 2022

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“…Assuming that the binding energies of the aggregate species of the TBDMSPLi initiator and the butyllithium initiator are similar in toluene and hexane, these observations suggest that higher temperatures favour formation of dimeric and monomeric species and, so, promotes 1,4 insertions. 28 When the polar solvent THF was used for the polymerization, the MHTPB and consequently the HTPB microstructure changed markedly to 10% t and 90% v.…”

Section: Paper Polymer Chemistrymentioning

confidence: 99%

“…13,18,[25][26][27] The kinetics and stereochemistry of this polymerization process are strongly contingent on the aggregate states of the initiator and of the propagating species in the polymerization media. 28 These aggregate states are themselves dependent on the structure of the chosen alkyllithium compound 28 and the polarity of the solvent. 13,22 Temperature can be used to control aggregate equilibria and, so, modify the relative occurrence of 1,4 and 1,2 insertions in the main chain.…”

Section: Introductionmentioning

confidence: 99%

Understanding and controlling the glass transition of HTPB oligomers

et al. 2021

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Synthesis and characterization of anionic polymerization initiator from functional styrene derivative

Babula,

Kozak,

Schab‐Balcerzak

2024

J of Applied Polymer Sci

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Understanding the mechanisms underlying living anionic polymerization is essential for advancing efficient and sustainable elastomer production technologies. This study investigates the introduction of a functional styrene derivative at the initiation of a styrene‐butadiene polymer chain with high efficiency. Butyllithium is the most widely used initiator in anionic polymerization due to its high reactivity, availability, and ability to provide precise control over polymer molecular weight and structure. Modified initiators, formed from N‐(dimethyl(vinylbenzyl)silyl)‐N,N‐bis(trimethylsilyl)amine and isomers of butyllithium (n‐, sec‐, and tert‐), increase initiation efficiency and reduce oligomer formation. The developed procedure demonstrates the effective use of a functional styrene derivative as an alpha chain‐end modifier. The formation of a unimeric structure improves from 15.6% to 88.3%, significantly increasing the yield of alpha functionalization. Direct transfer of the functional styrene derivative to the alpha position expands the potential for functionalization in anionic polymerization. The activity of the preinitiators is evaluated in styrene‐butadiene anionic copolymerization. The functional initiators are terminated and characterized by high‐performance liquid chromatography coupled with gel permeation chromatography to assess the degree of polymerization. This method enables quantitative analysis of oligomer formation. The synthesized copolymers are further characterized by their molar masses, microstructure, Mooney viscosity, and glass transition temperature.

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Effect of enthalpy of polar modifiers interaction with n-butyllithium on the reaction enthalpy, kinetics and chain microstructure during anionic polymerization of 1,3-butadiene

Cited by 7 publications

References 40 publications

Viscoelastic Behavior and Phase Structure of High-Content SBS-Modified Asphalt

Viscoelastic Behavior and Phase Structure of High-Content SBS-Modified Asphalt

Understanding and controlling the glass transition of HTPB oligomers

Synthesis and characterization of anionic polymerization initiator from functional styrene derivative

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