Preparation and characterizations of RTV epoxy blends using amide maleic anhydride‐g‐liquid polybutadience as both reactive toughening and curing components

Abstract

Amide maleic anhydride‐g‐liquid polybutadience (AMALPB) was synthesized using maleic anhydride‐g‐liquid polybutadience (MALPB) with ethylenediamine (EDA), and its structure was confirmed by FTIR and 1H‐nuclear magnetic resonance spectra, respectively. It was then used as a reactive toughening agent to make blends with diglycidyl end‐capped poly(bisphenol‐A‐co‐epichlorohydrin epoxy cured at room temperature. Their thermal decomposing behaviors did not show much difference because both EDA and AMALPB possessed similar aliphatic groups. All their glass transition temperatures (Tg) increased more than 10 °C than that of the neat epoxy, and with the addition of AMALPB, the blends were greatly strengthened upon heating as show from their storage moduli. When AMALPB was added at 10 wt %, its elongation at break increases to a maximum of 8.8% which was about two times higher than that of the neat epoxy, and its tensile strength also increased. However, the excessive addition of AMALPB resulted in an apparent decline in their tensile strength at content above 20%. The simultaneous improvements in both tensile strength and strain were attributed to the existence of well‐dispersed rubber particles in the continuous matrices performing plastic deformation that resulted from the chemical bonds of interfaces among the rubber particles and matrix, and meanwhile, inducing the deflection of the cracks. © 2017 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018, 135, 45985.

Mechanical and Thermal Properties of Epoxy/Poly(Styrene‐co‐Acrylonitrile) (SAN)/Organoclay Nanocomposites

“…Yu [25] studied the effect of content and nature of terminal groups of liquid or core-shell rubber on phase structure and viscoelastic properties of epoxy resins. Wu and Wang [26] observed the incorporation of functional groups grafted on to epoxy resin resulted in well dispersed rubber particles in epoxy resin. Amide maleic anhydride-g-liquid polybutadience resulted in simultaneous improvements in both tensile strength and strain due to better dispersion of rubber particles in epoxy matrix.…”

Evaluation ofbisphenol‐Aepoxy cured with diethylenetriamine by using phosphorus containing liquid poly(1,2‐butadiene) as multifunctional additives

“…When the size of the second phase particles increases, the distance between the two particles may decrease, and the shear deformation is not enough to stop the stress propagation, thus reducing the toughening effect. At the same time, the good dispersion of rubber particles in the epoxy collective (Figure 10b–d) is also an effective guarantee to improve the toughness 10,13,32 . At a high rubber concentrations, the rapid increase in the particle sizes and an almost constant number of particles(Figure 10e), which inevitably leads to the aggregation of P‐LEPB and thus insignificant toughening effect, 34 those are what happened for the curves shown in Figure 9.…”

“…1 H and 13 C nuclear magnetic resonance (NMR) spectra were collected via a Bruker AVANCE III 600 M (Bruker, Germany) and CDCl 3 was used as the solvent.…”

“…Sometimes, the strength and strain were found simultaneously improved by the reactive rubbers; we synthesized a reactive rubber toughener for RTV epoxy, it significantly improved the tensile strength and toughness of the epoxy resin in a very narrow range of amount, but excessive RTV also reduced the tensile strength. 13 Bach et al 14 prepared a carboxyl-terminated poly(acrylonitrile-co-butadiene) (CTBN) to modify epoxy and found that the fracture toughness and tensile strength were increased from 0.65 to 1.09 MPa and from 34.42 to 42.55 MPa, respectively, but the thermal degradation activation energy, the crosslinking density, and the glass transition temperature of epoxy were all decreased.…”

“…In our previous studies, reactive liquid polybutadiene was synthesized and used as a toughener to improve the comprehensive performances of epoxy, the thermal, mechanical and dielectric properties of the toughened epoxies were evaluated. 13,20 In this work, phosphorus containing reactive liquid epoxidate polybutadiene (P-LEPB) was synthesized by the reaction of the liquid epoxidate poly (1,2-butadine) with diphenyl phosphoryl chloride (DPCP), and the structure of P-LEPB was determined by FTIR, 1 H and 13 C nuclear magnetic resonance (NMR). Then P-LEPB was added in epoxy cured with diamine in an attempt to achieve improvements in their various performances.…”