Journal of Polymer Research

, 26:40 | Cite as

Optimization of initiator and activator for reactive thermoplastic pultrusion

  • Ke Chen
  • Mingyin Jia
  • Sun Hua
  • Ping XueEmail author


In order to manufacture continuous fiber reinforced thermoplastic composites with high fiber content, reactive thermoplastic pultrusion was developed by using the anionic polymerization of polyamide-6 in this study. Firstly, based on the polymerization time tests, combination of activator of difunctional hexamethylene-1,6-di carbamoylcaprolactam (C20) and initiator of sodium caprolactamate (C10) were chosen as the most suitable formula combination for pultrusion. Effects of concentrations of the activator C20 and the initiator C10 on the polymerization time, molecular weight of polymer and degree of conversion were also investigated. Then, the range of initial polymerization temperature was determined, which had a great influence on the impregnation of dense fiber reinforcement. Comparing with commercial polyamide-6, the anionic polyamide-6 has a higher modulus and lower elongation. Finally, continuous glass fiber reinforced polyamide-6 composites with 50% volume fraction were successfully pultruded. Great interfacial adhesion between fiber and polymer was observed by the scanning electron microscope.


Thermoplastic composites Pultrusion Polyamide-6 Formula optimization 



The authors would like to appreciate Mrs. Jianing Geng (School of International Education, Beijing University of Chemical Technology) for her help in modifying the language of the manuscript.


  1. 1.
    Safonov AA, Carlone P, Akhatov I (2017) Mathematical simulation of pultrusion processes: A review. Compos Struct 184:153–177CrossRefGoogle Scholar
  2. 2.
    Song YS, Youn JR, Gutowski TG (2009) Life cycle energy analysis of fiber-reinforced composites. Compos Part A-Appl S 40:1257–1265CrossRefGoogle Scholar
  3. 3.
    Baran I, Hattel JH, Tutum CC (2013) Thermo-chemical modelling strategies for the pultrusion process. Appl Compos Mater 20:1247–1263CrossRefGoogle Scholar
  4. 4.
    Baran I, Tutum CC, Hattel JH (2013) The effect of thermal contact resistance on the thermosetting pultrusion process. Compos Part B-Eng 45:995–1000CrossRefGoogle Scholar
  5. 5.
    Liang G, Garg A, Chandrashekhara K, Flanigan V, Kapila S (2005) Cure characterization of pultruded soy-based composites. J Reinf Plast Comp 24:1509–1520CrossRefGoogle Scholar
  6. 6.
    Borges SG, Ferreira CA, Andrade JM, Prevedello AL (2015) The influence of bath temperature on the properties of pultruded glass fiber reinforced rods. J Reinf Plast Comp 34:1221–1230CrossRefGoogle Scholar
  7. 7.
    Vuppalapati RR, Menta VGK, Chandrashekhara K, Schuman T (2014) Manufacturing and impact characterization of soy-based polyurethane pultruded composites. Polym Composite 35:1070–1077Google Scholar
  8. 8.
    Babeau A, Comas-Cardona S, Binetruy C, Orange G (2015) Modeling of heat transfer and unsaturated flow in woven fiber reinforcements during direct injection-pultrusion process of thermoplastic composites. Compos Part A-Appl S 77:310–318CrossRefGoogle Scholar
  9. 9.
    Rijswijk KV, Teuwen JJE, Bersee HEN, Beukers A (2009) Textile fiber-reinforced anionic polyamide-6 composites. Part I: The vacuum infusion process. Compos Part A-Appl S 40:1–10CrossRefGoogle Scholar
  10. 10.
    Novo PJ, Silva JF, Nunes JP, Marques AT (2016) Pultrusion of fibre reinforced thermoplastic pre-impregnated materials. Compos Part B-Eng 89:328–339CrossRefGoogle Scholar
  11. 11.
    Silva RF, Silva JF, Nunes JP, Bernardo CA, Marques AT (2008) New powder coating equipment to produce continuous fibre thermoplastic matrix towpregs. Mater Sci Forum 587:246–250CrossRefGoogle Scholar
  12. 12.
    Angelov I, Wiedmer S, Evstatiev M, Friedricha K, Mennigc G (2007) Pultrusion of a flax/polypropylene yarn. Compos Part A-Appl S 38:1431–1438CrossRefGoogle Scholar
  13. 13.
    Linganiso LZ, Bezerra R, Bhat S, John M, Braeuning R, Anandjiwala RD (2014) Pultrusion of flax/poly (lactic acid) commingled yarns and nonwoven fabrics. J Thermoplast Compos 27:1553–1572CrossRefGoogle Scholar
  14. 14.
    LuisierA BPE, Månson JAE (2003) Reaction injection pultrusion of PA12 composites: process and modelling. Compos Part A-Appl S 34:583–595CrossRefGoogle Scholar
  15. 15.
    Barhoumi N, Maazouz A, Jaziri M, Abdelhedi R (2013) Polyamide from lactams by reactive rotational molding via anionic ring-opening polymerization: Optimization of processing parameters. Express Polym Lett 7:76–87CrossRefGoogle Scholar
  16. 16.
    Kulicke WM, Clasen C (2004) Viscosimetry of polymers and polyelectrolytes. Springer, BerlinCrossRefGoogle Scholar
  17. 17.
    Brouwer WD, Van Herpt E, Labordus M (2003) Vacuum injection moulding for large structural applications. Compos Part A-Appl S 34:551–558CrossRefGoogle Scholar
  18. 18.
    Van Rijswijk K, Bersee HEN, Jager WF, Picken SJ (2006) Optimisation of anionic polyamide-6 for vacuum infusion of thermoplastic composites: choice of activator and initiator. Compos Part A-Appl S 37:949–956CrossRefGoogle Scholar
  19. 19.
    Russo S, Maniscalco S, Ricco L (2015) Some new perspectives of anionic polyamide 6 (APA 6) synthesis. Polym Advan Technol 26:851–854CrossRefGoogle Scholar
  20. 20.
    Davé RS, Kruse RL, Stebbins LR, Udipi K (1997) Polyamide from lactams via anionic ring-opening polymerization: kinetics. Polymer 38:939–947CrossRefGoogle Scholar
  21. 21.
    Teuwen JJE, Geenen AAV, Bersee HEN (2013) Novel reaction kinetic model for anionic polyamide-6. Macromol Mater Eng 298:163–173CrossRefGoogle Scholar
  22. 22.
    Gong Y, Liu A, Yang G (2010) Polyamide single polymer composites prepared via in situ anionic polymerization of ε-caprolactam. Compos Part A-Appl S 41:1006–1011CrossRefGoogle Scholar
  23. 23.
    Van Rijswijk K, Bersee HEN (2007) Reactive processing of textile fiber-reinforced thermoplastic composites-an overview. Compos Part A-Appl S 38:666–681CrossRefGoogle Scholar
  24. 24.
    Zhilkova K, Mateva R, Kyulavska M (2017) Copolymers of ε-caprolactam and polypropylene oxide via anionic polymerization: synthesis and properties. J Polym Res 24(10):162–172CrossRefGoogle Scholar
  25. 25.
    Ricco L, Russo S, Orefice G, Riva F (1999) Anionic poly (ε-caprolactam): Relationships among conditions of synthesis, chain regularity, reticular order, and polymorphism. Macromolecules 32:7726–7731CrossRefGoogle Scholar
  26. 26.
    Udipi K, Dave´ RS, Kruse RL, Stebbins LR (1997) Polyamides from lactams via anionic ring-opening polymerization: 1. Chemistry and some recent findings. Polymer 38:927–938CrossRefGoogle Scholar

Copyright information

© The Polymer Society, Taipei 2019

Authors and Affiliations

  1. 1.Beijing University of Chemical TechnologyInstitute of Plastic Machinery and EngineeringBeijingChina

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