Synthesis of Polyisoprene via Miniemulsion Polymerisation: Effect on Thermal Behaviour, Colloidal Properties and Stereochemistry

Chouytan, Jadsadaporn; Beraheng, Sumsuriya; Kalkornsurapranee, Ekwipoo; Fellows, Christopher M.; Kaewsakul, Wisut

doi:10.1007/bf03449173

Cited by 4 publications

(5 citation statements)

References 25 publications

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“…However, the reinforcing power is considerable, especially in the case of the Clay-PIP containing 5 wt% nanoclay relative to the monomer content. It is not only due to the greatest extent of immobilized polymer in this composite, but also due to an intrinsic character of the Clay-PIPs as reported in our previous work [43]. Polyisoprene synthesized in the present work consists of about 63 mol% trans molecular configuration which exhibits rather rigid compared to the cis-structure of natural rubber: see Figure 6.…”

Section: Resultsmentioning

confidence: 50%

“…The smaller the particle size, the higher the particle number concentration (N P ) for the same mass, leading to more reactive sites in the system due to the greater number of monomer micelles, and thus higher reactivity toward polymerization reaction. A terminology commonly used to refer to the reactive sites is “reaction loci” [43]. The SFE technique appears to have more polymerization loci since it shows a greater N P compared to the BE system.…”

Section: Resultsmentioning

confidence: 99%

“…The SFE technique appears to have more polymerization loci since it shows a greater N P compared to the BE system. According to the calculation [43] based on the data from this particle size analysis, the N P of the latexes are shown in Table 4. The result indicates that the SFE has a faster rate of polymerization due to more reaction loci resulting in a higher percentage of polymer conversion: see Table 3.…”

Section: Resultsmentioning

confidence: 99%

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In Situ Modification of Polyisoprene by Organo-Nanoclay during Emulsion Polymerization for Reinforcing Natural Rubber Thin Films

et al. 2019

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Nanoclay-modified polyisoprene latexes were prepared and then used as a reinforcing component in natural rubber (NR) thin films. Starve-fed emulsion (SFE) polymerization gives a higher conversion than the batch emulsion (BE), while the gel and coagulation contents from both systems are comparable. This is attributed to the SFE that provides a smaller average polymer particle size which in turn results in a greater polymerization locus, promoting the reaction rate. The addition of organo-nanoclay during synthesizing polyisoprene significantly lessens the polymerization efficiency because the nanoclay has a potential to suppress nucleation process of the reaction. It also intervenes the stabilizing efficiency of the surfactant—SDS or sodium dodecyl sulfate, giving enlarged average sizes of the polymer particles suspended in the latexes. TEM images show that nanoclay particles are attached on and/or inserted in the polymer particles. XRD and thermal (differential scanning calorimetry (DSC) and thermogravimetric analysis (TGA)) analyses were employed to assess the d-spacing of nanoclay structure in NR nanocomposite films, respectively. Based on the overall results, 5 wt% of nanoclay relative to the monomer content utilized to alter the polyisoprene during emulsion polymerization is an optimum amount since the silicate plates of nanoclay in the composite exhibit the largest d-spacing which maximizes the extent of immobilized polymer constituent, giving the highest mechanical properties to the films. The excessive amounts of nanoclay used, i.e., 7 and 10 wt% relative to the monomer content, reduce the reinforcing power because of the re-agglomeration effect.

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Section: Resultsmentioning

confidence: 50%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

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In Situ Modification of Polyisoprene by Organo-Nanoclay during Emulsion Polymerization for Reinforcing Natural Rubber Thin Films

et al. 2019

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“…Silica nanoparticle is a common rigid filler that is used to increase the stiffness and fracture energy of CFRPs without influencing the kinetic properties of the resin, however, the increase in fracture energy is relatively smaller compared to rubber particles. As advantage silica nanoparticles are not filtered during infusion and have a small effect on the viscosity that can reach 20% [4]. Liquid reactive rubbers are normally used to improve the toughness of epoxies such as carboxyl-terminated butadiene acrylonitrile (CTBN).…”

Section: Introductionmentioning

confidence: 99%

Effect of Impact Modifiers on Strength and Fracture Toughness of CFRPs

et al. 2021

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The aim of this work is to study the effect of core-shell rubbers on the mechanical properties of CFRPs.For the preparation of composites, two types of resins were used, a three-component Araldite resin (resin-hardener-accelerator system in proportions of 100-90-0,5 by weight respectively), and MX 156, which contains 25 % core-shell elastomers and 75 % Araldite resin. Depending on the mechanical test, two types of carbon fibre fabrics (UD C415, G0926) are used with corresponding number of layers. The composites were prepared by vacuum infusion and cut to the appropriate dimensions by water-cutting. They were tested for mechanical performance, by bending, shearing, tensile, impact and fracture toughness tests, to compare the properties of CSR-containing composites and reference CFRPs. Fracture analysis of specimens was performed by scanning electron microscopy (SEM). The results exhibited a 50% increase in impact strength while the energy absorbed during the fracture toughness test was 4 times greater on specimens with CSR than reference.

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“…Solution‐based fabrication processes can be easily applied and usually do not need any special and expensive equipment. For example, various solution‐based methods such as atom transfer radical polymerization (ATRP), 12 reversible addition–fragmentation chain‐transfer (RAFT), 13 radiation induced polymerization, 14 cationic, 15 anionic, 16 and miniemulsion 17 have been employed to produce PI and PI copolymers. However, the solvents used in the solution‐based methods may cause physical damages and defects on the especially fragile substrate surfaces.…”

Section: Introductionmentioning

confidence: 99%

Vapor deposition polymerization of synthetic rubber thin film in a plasma enhanced chemical vapor deposition reactor

Gürsoy

2020

J of Applied Polymer Sci

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Rubber is one of the most commonly used industrial materials worldwide. However, there is a gap in the literature on the production of rubber thin films in nanoscale. When the rubber thin films are produced in nanoscale, they can be used in high-tech applications where bulk rubbers have never been used before. This study is one of the first investigations to focus on the vapor-based production of the polyisoprene (PI), which is an important member of the synthetic rubber class. For this purpose, a single-step, rapid and environmentally friendly method based on plasma enhanced chemical vapor deposition (PECVD) was employed to produce PI thin films using 2-methyl-1,3-butadiene (isoprene). The high-vapor pressure of isoprene makes it a promising monomer for the production of chemical vapor deposition polymers. The effect of plasma processing parameters on the PI deposition rate was investigated. The deposition rate of PI thin film as high as 40 nm/min was achieved and the contact angle of PI coated bamboo surface was found to be 146.8. The mechanical durability and laundering tests of PI thin films were performed. Based on this study results, PI thin films produced by PECVD can be used in a number of potential applications.

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Synthesis of Polyisoprene via Miniemulsion Polymerisation: Effect on Thermal Behaviour, Colloidal Properties and Stereochemistry

Cited by 4 publications

References 25 publications

In Situ Modification of Polyisoprene by Organo-Nanoclay during Emulsion Polymerization for Reinforcing Natural Rubber Thin Films

In Situ Modification of Polyisoprene by Organo-Nanoclay during Emulsion Polymerization for Reinforcing Natural Rubber Thin Films

Effect of Impact Modifiers on Strength and Fracture Toughness of CFRPs

Vapor deposition polymerization of synthetic rubber thin film in a plasma enhanced chemical vapor deposition reactor

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