The effect of initiator and weight ratio on dynamic-mechanical properties of multilayer latex IPN with core/shell morphology

Document Type : Research Article


Composite Research Center, Malek Ashtar University of Technology, Tehran, Iran


Polymers have good dynamic mechanical properties and high damping capacity due to their viscoelastic nature, especially in the glass transition range, and are considered a good damper with a loss factor greater than 0.3 and a peak temperature range of at least 60-80ºC. Two of the best ways to expand the damping range are fabricating the core/shell latex particles with a specific morphology and using interpenetrating polymer networks in the core and shell sections. The aim of this study is to synthesize and investigate the dynamic-mechanical properties of interpenetrating polymer networks with core/shell morphology. A set of multilayer core/shell/shell latex particles with styrene-acrylic monomers were synthesized by varying the initiator (thermal initiator and redox initiator) via semi-continuous emulsion polymerization. In this study, synthesized particles were characterized with fourier transform infrared (FT-IR) spectroscopy, the morphology was determined by transfer electron microscopy (TEM), and the size and size distribution were investigated via dynamic laser scattering (DLS), which represent nano-scale particles with narrow distribution. The damping properties of the formed films were studied by dynamic mechanical analysis (DMA). The factors affecting the formation of poly(styrene/methyl methacrylate/butyl acrylate)-based core/shell particles, including the type of initiator and layer mass ratio, were discussed. The results showed that the IPN core/shell latex particles with a thermal initiator exhibited the best damping properties, with a broad effective damping range (tanδ > 0.3). The influence of the layer mass ratio on damping was also explored in this work.

Graphical Abstract

The effect of initiator and weight ratio on dynamic-mechanical properties of multilayer latex IPN with core/shell morphology


  • Interpenetrating polymer networks with core/shell morphology confirm their high damping capacity (tanδ > 0.3 and damping temperature range > 100°C).
  • The IPN core/shell latex particles with a thermal initiator exhibited the best damping properties.
  • By changing the weight ratio of the layers and the amount of PBA in the last layer, the effective damping range increases.


[1] M.M. Mazidi, M.K.R. Aghjeh, H.A. Khonakdar, U. Reuter, Structure-property relationships in super-toughened polypropylene-based ternary blends of core-shell morphology, Rsc. Adv. 6 (2016) 1508-1526.
[2] D. Parker, H.J. Sue, J. Huang, A.F. Yee, Toughening mechanisms in core-shell rubber modified polycarbonate, Polymer, 31 (1990) 2267-2277.
[3] J.Y. Qian, R.A. Pearson, V.L. Dimonie, M.S. El‐Aasser, Synthesis and application of core-shell particles as toughening agents for epoxies, J. Appl. Polym. Sci. 58 (1995) 439-448.
[4] F. Li, Y. Gao, Y. Zhang, W. Jiang, Design of high impact thermal plastic polymer composites with balanced toughness and rigidity: Toughening with core-shell rubber modifier, Polymer, 191 (2020) 122237.
[5] M. Sedki, A. Hefnawy, R.Y.A. Hassan, I.M. El-Sherbiny, Core-shell hyperbranched chitosan nanostructure as a novel electrode modifier, Int. J. Biol. Macromol. 93 (2016) 543-546.
[6] A. Mayer, T. Pith, G. Hu, M. Lambla, Effect of the structure of latex particles on adhesion. Part I: Synthesis and characterization of structured latex particles of acrylic copolymers and their peel adhesion behavior, J. Polym. Sci. Pol. Phys. 33 (1995) 1781-1791.
[7] C. Xu, T. Qiu, J. Deng, Y. Meng, L. He, X. Li, Dynamic mechanical study on multilayer core-shell latex for damping applications, Prog. Org. Coat. 74 (2012) 233-239.
[8] A. Petukhova, A.S. Paton, Z. Wei, I. Gourevich, S. V. Nair, H.E. Ruda, A. Shik, E. Kumacheva, Polymer multilayer microspheres loaded with semiconductor quantum dots, Adv. Funct. Mater. 18 (2008) 1961-1968.
[9] W. Chen, S. Bhaumik, S.A. Veldhuis, G. Xing, Q. Xu, M. Grätzel, S. Mhaisalkar, N. Mathews, T.C. Sum, Giant five-photon absorption from multidimensional core-shell halide perovskite colloidal nanocrystals, Nat. Commun. 8 (2017) 15198-15207.
[10] Y. Su, H. Guo, Z. Wang, Y. Long, W. Li, Y. Tu, Au@Cu2O core-shell structure for high sensitive non-enzymatic glucose sensor, Sensor. Actuat. B- Chem. 255 (2018) 2510-2519.
[11] D. Klempner, Advances in interpenetrating polymer networks, CRC Press, 1994.
[12] D. Klempner, L.H. Sperling, L.A. Utracki, Interpenetrating polymer networks, American Chemical Society, Washington, DC (United States), 1994.
[13] L.A. Utracki, B.D. Favis, Polymer alloys and blends, Handbook of Polymer Science and Technology, vol. 4, 1989, pp. 121-185.
[14] L.H. Sperling, T. Chiu, D.A. Thomas, Glass transition behavior of latex interpenetrating polymer networks based on methacrylic/acrylic pairs, J. Appl. Polym. Sci. 17 (1973) 2443-2455.
[15] J. D. Zhang, M. J. Yang, Y. R. Zhu, H. Yang, Synthesis and characterization of crosslinkable latex with interpenetrating network structure based on polystyrene and polyacrylate, Polym. Int. 55 (2006) 951-960.
[16] L.H. Sperling, J.J. Fay, Factors which affect the glass transition and damping capability of polymers, Polym. Advan. Technol. 2 (1991) 49-56.
[17] J.A. Grates, D.A. Thomas, E.C. Hickey, L.H. Sperling, Noise and vibration damping with latex interpenetrating polymer networks, J. Appl. Polym. Sci. 19 (1975) 1731-1743.
[18] L.H. Sperling, Synthesis of IPNs and Related Materials, in: Interpenetrating Polymer Networks and Related Materials, Springer, Boston, MA (United States), 1981, pp. 65-103.
[19] F. Zahedi, I.A. Amraei, M.A. Fathizade, Investigation of dynamic-mechanical properties of multilayer latex IPNs (MLIPNs) with core/shell morphology: Synthesis and characterization, Polymer, 83 (2016) 162-171.
[20] M.S. Silverstein, Interpenetrating polymer networks: So happy together?, Polymer 207 (2020) 122929.
[21] P.C. Hiemenz, T.P. Lodge, Polymer chemistry, 2nd ed., CRC press, 2007.
[22] L.Y. Wan, L.P. Chen, X.L. Xie, Z.P. Li, H.Q. Fan, Damping properties of a novel soft core and hard shell PBA/PMMA composite hydrosol based on interpenetrating polymer networks, Iran. Polym. J. 20 (2011) 659-669.
[23] E. Tang, M. Yao, P. Du, M. Yuan, S. Liu, Synthesis and dynamic mechanical study of core-shell structure epoxy/polyacrylate composite particle, J. Polym. Res. 23 (2016) 204.
[24] G. Wu, C. Wang, Z. Tan, H. Zhang, Effect of temperature on emulsion polymerization of n-butyl acrylate, Procedia Engineer. 18 (2011) 353-357.