Étude de copolymères greffés ABS (Acrylonitrile‐Butadiène‐Styrène). IV. Évolution de la fraction greffée dans la réaction de greffage

Locatelli, Par Jean‐Louis; Riess, et Gèrard

doi:10.1002/apmc.1973.050320109

Cited by 20 publications

(3 citation statements)

References 11 publications

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“…Since the rubber microstructure strongly affects the grafting reactions, [45,47] the rate constants of chemical initiation of butadiene units and the rate constant of chain transfer from styryl macroradicals to B were adopted from the heterogeneous model by Luciani, [37] that involved a rubber with essentially the same microstructure as the one used in this work. Rate constants of S thermal initiation in Reaction (R2), S chemical initiation in Reaction (R3), and S homopropagation in Reaction (R8) were also adopted from Luciani.…”

Section: Model Adjustmentmentioning

confidence: 99%

“…Measurements from blends containing benzene/SAN/PB/BPO and benzene/AN/SAN/PB/BPO showed that initiator concentration was about three times higher in the PB-rich phase than the corresponding concentration in the SAN-rich phase. [44] Locatelli and Riess [45,46] modeled the copolymerization of S and AN in the presence of PB. To this purpose, a simple kinetic mechanism involving initiation, propagation, and termination was proposed, and rather empiric correlations were employed for estimating initiator efficiencies, initiator concentrations, and termination rate constants in each phase.…”

Section: Introductionmentioning

confidence: 99%

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A Mathematical Model of the Bulk Copolymerization of Styrene and Acrylonitrile in the Presence of Polystyrene‐block‐Polybutadiene

Elizarrarás

Morales

León

et al. 2008

Macro Theory & Simulations

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The bulk copolymerization of styrene and acrylonitrile in the presence of SB using BPO as initiator was investigated. Reactions were carried out at 80 °C with different initial SB concentrations. Global variables, such as conversion and cumulative grafting efficiency of SAN, were determined during the prepolymerization. The isolated non‐grafted SAN was also analyzed to determine its average molar masses and composition. A mathematical model was developed, and theoretical predictions were compared with experimental data. A good agreement between measurements and simulations was obtained from a heterogeneous model when BPO was evenly distributed between phases.magnified image

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Section: Model Adjustmentmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A Mathematical Model of the Bulk Copolymerization of Styrene and Acrylonitrile in the Presence of Polystyrene‐block‐Polybutadiene

Elizarrarás

Morales

León

et al. 2008

Macro Theory & Simulations

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“…It is well known that the mechanical properties of ABS resin are greatly affected by the sizes, structures, dispersion state and relative amounts of rubber particles 1, 18, 19. In the experiments carried out, PB or poly(styrene‐ co ‐butadiene) (SBR) was grafted in the synthesizing process using the emulsion in situ suspension polymerization method and the particles obtained were used to prepare the ABS resins.…”

Section: Resultsmentioning

confidence: 99%

Synthesis and characterization of ABS resin using in situ transferring from emulsion to suspension polymerization

Zhang

Luan

Lin

et al. 2006

Polymer International

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A novel approach based on an emulsion in situ suspension polymerization process for synthesizing poly(acrylonitrile–butadiene–styrene) (ABS) resin is reported. Experimental results show that the reaction system can be transformed from an emulsion state to a suspension polymerization state steadily with the content of polybutadiene (PB) in the range 0–15 wt% in ABS resin. When PB is replaced by poly(styrene‐co‐butadiene) with the content of rubber particles being kept below 20 wt%, the emulsion system can be easily transferred to the suspension polymerization state through a process of latex coagulation in the forward direction, which means that the emulsion solution was dripped slowly into the suspension reaction system in the presence of coagulating agent. The dispersion status of the rubber particles in the ABS resin was studied using transmission electron microscopy, which indicated that the rubber particles were in a dispersed state in a continuous matrix of poly(styrene‐co‐acrylonitrile) when the content of rubber particles was below 20 wt%. The mechanical properties of the ABS resins obtained are as follows: elongation at break, 9.4–45.7%; yield tensile strength, 35.1–42.2 MPa; impact strength, 98.2–116.3 J m−1. Copyright © 2006 Society of Chemical Industry

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Acrylonitrile Polymers, ABS Resins

Kulich¹,

Pace²,

Fritch³

et al. 2000

Kirk-Othmer Encyclopedia of Chemical Technology

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Acrylonitrile–butadiene–styrene (ABS) polymers are composed of elastomer dispersed as a grafted particulate phase in a thermoplastic matrix of styrene and acrylonitrile copolymer (SAN). The presence of SAN grafted onto the elastomeric component, usually polybutadiene or a butadiene copolymer, compatabilizes the rubber with the SAN component. Property advantages provided by this graft terpolymer include excellent toughness, good dimensional stability, good processibility, and chemical resistance. The system is structurally complex. This allows considerable versatility in the tailoring of properties to meet specific product requirements. Consequently, research and development in ABS systems is active. Numerous grades of ABS are available, including new alloys and specialty grades for high heat, flaming‐retardant, or static dissipative product requirements. Good chemical resistance combined with the relatively low water absorptivity \documentclass{article}\usepackage{amssymb}\pagestyle{empty}\begin{document}${{(}{\rm{<}}1{\%}{)}}$\end{document} results in high resistance to staining agents. Antioxidants substantially improve oxidative stability. Applications involving extended outdoor exposure require the use of stabilizing additives, pigments, and protective coatings. In manufacturing, grafting is achieved by the free‐radical copolymerization of styrene and acrylonitrile monomers. The three commercial processes for manufacturing ABS are emulsion, mass, and mass‐suspension. ABS is sold as an unpigmented product for on‐line coloring using color concentrates during molding, or as precolored pellets. ABS can be processed by compression and injection molding, extrusion, calendering, and blow‐molding. Post‐processing operations include cold forming, painting, and adhesive bonding. As a “bridge” polymer between commodity plastics and higher performance engineering thermoplastics, ABS has become the largest selling engineering thermoplastic.

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Étude de copolymères greffés ABS (Acrylonitrile‐Butadiène‐Styrène). IV. Évolution de la fraction greffée dans la réaction de greffage

Cited by 20 publications

References 11 publications

A Mathematical Model of the Bulk Copolymerization of Styrene and Acrylonitrile in the Presence of Polystyrene‐block‐Polybutadiene

A Mathematical Model of the Bulk Copolymerization of Styrene and Acrylonitrile in the Presence of Polystyrene‐block‐Polybutadiene

Synthesis and characterization of ABS resin using in situ transferring from emulsion to suspension polymerization

Acrylonitrile Polymers, ABS Resins

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