The Effect of Molecular Complexes of Lactam-Containing and Proton-Donor Substances on the Adhesion Properties of Adhesive Composites

2017 ◽  
Vol 44 (11) ◽  
pp. 37-40
Author(s):  
A.F. Puchkov ◽  
N.A. Tret'yakova ◽  
S.Ya. Khodakova ◽  
I.I. Abol'skaya ◽  
S.P. Bobrov
Keyword(s):  
Bond Strength ◽  
Molecular Complexes ◽  
General Purpose ◽  
Proton Donor ◽  
Butadiene Rubber ◽  
Chemical Bonds ◽  
Adhesion Properties ◽  
Chloroprene Rubber ◽  
Methylenediphenyl Diisocyanate ◽  
Adhesion Activity

The results of investigating the effect of a molecular complex (MC) based on a lactam-containing product and a hydroxyl-containing compound on the adhesion properties of elastomeric adhesives are set out. The MCs comprise binary melts based on triatomic alcohol (TA) and ε-caprolactam. An MC was introduced into an adhesive based on chloroprene rubber in different ratios together with the isocyanate 4,4’-methylenediphenyl diisocyanate (MDI). The adhesion activity of the MC was assessed from the bond strength between the elements in rubber–cord composites (a rubber compound based on BNKS-40AMN nitrile butadiene rubber + cord coated with a rubber mix based on general-purpose rubbers according to GOST 6768-75). Comparison of the IR spectra (FSM 1201 IR Fourier spectrometer) of the MC and its individual constituents makes it possible to suggest the presence of hydrogen bonds in the MC. Analysis of NMR spectra (Bruker Avance-400 NMR spectrometer) of the MC showed the absence of new chemical bonds between its components. Theoretically, a binary MC introduced into an adhesive composite together with isocyanate should promote an increase in the bond strength between the substrates through the formation of urethane groups. The results of testing the MC in the composition of adhesives showed that a higher bond strength is possessed by rubber–cord specimens with a ratio of TA and ε-caprolactam of 2:1. The introduction of an MC together with MDI leads to a 25% increase in adhesion strength in the adhesive joint.

scholarly journals Enhancement of Chloroprene/Natural/Butadiene Rubber Nanocomposite Properties Using Organoclays and Their Combination with Carbon Black as Fillers

Polymers ◽  
2021 ◽  
Vol 13 (7) ◽  
pp. 1085
Author(s):  
Patricia Castaño-Rivera ◽  
Isabel Calle-Holguín ◽  
Johanna Castaño ◽  
Gustavo Cabrera-Barjas ◽  
Karen Galvez-Garrido ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Carbon Black ◽  
High Performance ◽  
Rubber Matrix ◽  
Butadiene Rubber ◽  
X Ray Diffraction ◽  
X Ray ◽  
Rubber Blends ◽  
Ft Ir ◽  
Chloroprene Rubber

Organoclay nanoparticles (Cloisite® C10A, Cloisite® C15) and their combination with carbon black (N330) were studied as fillers in chloroprene/natural/butadiene rubber blends to prepare nanocomposites. The effect of filler type and load on the physical mechanical properties of nanocomposites was determined and correlated with its structure, compatibility and cure properties using Fourier Transformed Infrared (FT-IR), X-ray Diffraction (XRD), Thermogravimetric Analysis (TGA) and rheometric analysis. Physical mechanical properties were improved by organoclays at 5–7 phr. Nanocomposites with organoclays exhibited a remarkable increase up to 46% in abrasion resistance. The improvement in properties was attributed to good organoclay dispersion in the rubber matrix and to the compatibility between them and the chloroprene rubber. Carbon black at a 40 phr load was not the optimal concentration to interact with organoclays. The present study confirmed that organoclays can be a reinforcing filler for high performance applications in rubber nanocomposites.

Evaluation of Adhesion Properties of Modified Asphalt Binders with Use of Binder Bond Strength Test

2017 ◽  
Vol 2632 (1) ◽  
pp. 88-98 ◽  
Author(s):  
Weidong Huang ◽  
Lu Zhou
Keyword(s):  
Bond Strength ◽  
Asphalt Binder ◽  
Gel Permeation Chromatography ◽  
Crumb Rubber ◽  
Asphalt Binders ◽  
Adhesion Properties ◽  
Rubber Powder ◽  
Positive Effects ◽  
Tracking Device ◽  
Styrene Butadiene

Moisture damage is a prominent problem of asphalt pavements. The bond strength between asphalt and aggregates is a crucial factor that influences the capability of asphalt to resist moisture-induced damage. In this study, a binder bond strength (BBS) test was conducted to evaluate the effects of various modifiers and additives of different amounts on bond strength between asphalt and aggregates. Furthermore, the influence of styrene–butadiene–styrene (SBS) on adhesion behavior of asphalt binder was investigated through a gel permeation chromatography (GPC) test. Finally, the results of the BBS test were compared with the findings obtained from a Hamburg wheel-tracking device (HWTD) test, which reflected the moisture sensitivity of mixtures under wet conditions. Results indicated that gilsonite, high-density polyethylene, and polyphosphoric acid improved the bond strength of the base asphalt; SBS had no positive effects on asphalt adhesion properties; and SBS at a low amount reduced the bond strength. Ethylene bis-stearamide wax, crumb rubber, terminal blend (TB) rubber powder, and compound modifier TB rubber powder plus SBS decreased the bond strength. The GPC test results showed that SBS possibly did not actively contribute to the formation of bond strength between asphalt and aggregates. Test data for BBS and HWTD tests under wet conditions confirmed that there was no discernible correlation between these two tests when adhesion properties of modified asphalts were evaluated. However, the results of the BBS test were in accordance with those of the HWTD test when the adhesion of asphalt with different amounts of the same modifier and the mixture resistance to water damage were evaluated.

PREPARATION OF LOW TEMPERATURE RESISTANT AND HIGH ELECTRICAL INSULATION CHLOROPRENE RUBBER–BUTADIENE RUBBER BLENDS

2014 ◽  
Vol 87 (2) ◽  
pp. 360-369 ◽  
Author(s):  
Junping Zheng ◽  
Jin Tan ◽  
Hong Gao ◽  
Chuanzeng Wang ◽  
Zhilei Dong
Keyword(s):  
Mechanical Properties ◽  
Low Temperature ◽  
Mechanical Analysis ◽  
Electrical Insulation ◽  
Butadiene Rubber ◽  
Temperature Resistance ◽  
Rubber Blends ◽  
Chloroprene Rubber ◽  
Low Temperature Resistance ◽  
Electrical Insulation Properties

ABSTRACT To satisfy some special demands of many applications in the fields of aerospace and the electronic industry, low temperature resistant and high electrical insulation chloroprene rubber (CR) was prepared by blending pristine CR with different weight ratios of butadiene rubber (BR). The low temperature resistance, electrical insulation properties, and mechanical properties of CR/BR blends were investigated. With increasing BR content, the low temperature resistance and electrical insulation properties were improved, whereas the tensile strength and elongation at break decreased. For the CR/BR (65/35) blend, filled with SiO2, the brittleness temperature (Tb) was reduced to −61 °C and the high electrical insulation properties were obtained without sacrificing mechanical properties too much. The tan δ plots of CR/BR blends, investigated by dynamic mechanical analysis, also revealed that BR could reduce glass transition temperature (Tg) and improve low temperature resistance of CR. The phase contrast microscope images of CR/BR blends demonstrated that the phase structure of the blends changed with increasing BR content. Furthermore, the fracture surfaces of CR/BR blends, observed by scanning electron microscopy, showed that the compatibility of CR/BR blends was poor although the CR/BR blends were homogeneous in macrostructure.

scholarly journals The effect of diammonium phosphate and sodium silicate on the adhesion and fire properties of birch veneer

Holzforschung ◽  
2020 ◽  
Vol 74 (4) ◽  
pp. 372-381
Author(s):  
Saara Hautamäki ◽  
Michael Altgen ◽  
Daniela Altgen ◽  
Erik Larnøy ◽  
Tuomas Hänninen ◽  
...  
Keyword(s):  
Thermal Properties ◽  
Bond Strength ◽  
Sodium Silicate ◽  
Fire Retardant ◽  
Diammonium Phosphate ◽  
Thermal Testing ◽  
Fire Retardants ◽  
Adhesion Properties ◽  
Fire Properties ◽  
The Impact

AbstractIn built environments the combustibility of wood is a great concern, which limits the use of wood as a building material due to legislation. The reaction-to-fire properties of wood can be altered with the use of fire-retardant chemicals, and most of the commonly used fire retardants already have a long history of use. However, only limited information is available on the impact of different fire retardants on the adhesion properties of wood. Additionally, comparative studies between chemicals from different groups of fire retardants is scarce. The objective of this study was to investigate and compare the effects of two commonly used fire retardants, sodium silicate (SS) and diammonium phosphate (DAP), on veneer properties, the focus being especially on thermal behavior and adhesion. Thermal properties and combustibility were studied using thermogravimetric analysis (TGA), flame test and calorimetry. Glue bond strength was analyzed with an automated bonding evaluation system (ABES) and the leaching of chemicals was determined according to EN84. Additionally, the surface characteristics of modified veneers were imaged with scanning electron microscopy (SEM). Results revealed notable differences in the thermal properties of SS and DAP, with DAP having better fire-retardant performance in all thermal testing. SS also affected thermal properties and combustibility of modified veneers, but the effect was only moderate compared to DAP. Neither SS or DAP had any significant resistance against leaching but ABES testing showed a notable increase in the glue bond strength of DAP modified veneers.

Physical and Morphological Properties of Styrene Butadiene Rubber / Recycled Chloroprene Rubber (SBR/CRr) Blends

2013 ◽  
Vol 795 ◽  
pp. 119-123
Author(s):  
Ahmad Azmi Azrem ◽  
N.Z. Noriman ◽  
M.N. Razif ◽  
S.T. Sam ◽  
M.S. Saiful Nizwan
Keyword(s):  
Morphological Properties ◽  
Styrene Butadiene Rubber ◽  
Tensile Fracture ◽  
Butadiene Rubber ◽  
Tensile Fracture Surface ◽  
Rubber Blends ◽  
Roll Mill ◽  
Chloroprene Rubber ◽  
Blend Ratios ◽  
Styrene Butadiene

The effects of physical and morphological properties of styrene butadiene rubber/virgin chloroprene rubber blends (SBR/CRv) and styrene butadiene rubber/recycled chloroprene rubber blends (SBR/CRr) were investigated. Both SBR/CRv blends and SBR/CRr blends were prepared using two roll mill at room temperature with blend ratios 95/5, 85/15, 75/25, 65/35 and 50/50. The range size of CRr used in this study was 0.3 0.7 mm. The SBR/CRr blends shows higher value of hardness and crosslink density compared to SBR/CRv blends at all blend ratios. The scanning electron microscopy (SEM) of tensile fracture surface of SBR/CRr blends at 15 blend ratio illustrated a better adhesion and dispersion of CRr with SBR matrix compared with SBR/CRv blends.

scholarly journals The effect of metal oxide on the cure, morphology, thermal and mechanical characteristics of chloroprene and butadiene rubber blends

2019 ◽  
Vol 77 (8) ◽  
pp. 4131-4146 ◽  
Author(s):  
Aleksandra Smejda-Krzewicka ◽  
Anna Olejnik ◽  
Krzysztof Strzelec
Keyword(s):  
Metal Oxide ◽  
Metal Oxides ◽  
Cross Linking ◽  
Butadiene Rubber ◽  
Rubber Blends ◽  
Chloroprene Rubber ◽  
Index Value ◽  
Positive Effect ◽  
Very High

Abstract This paper discusses the role of metal oxides (MeO) in the cross-linking process and useful properties of chloroprene and butadiene rubber (CR/BR) blends. Iron(III) oxide (Fe2O3), iron(II,III) oxide (Fe3O4), silver(I) oxide (Ag2O) or zinc oxide were used. It has found that every proposed metal oxide can be used as a cross-linking agent of the CR/BR blends. The degree of cross-linking was evaluated by means of vulcametric parameters, equilibrium swelling in selected solvents and Mooney–Rivlin elasticity constants. The properties of the cured CR/BR products, such as tensile strength, stress at elongation, tension set under constant elongation and compression set, were also investigated. The results revealed that all CR/BR/MeO vulcanizates were characterized by a high cross-linking degree and satisfying mechanical properties. The most important advantage of obtained rubber goods is very high resistance to flame. The increase in the oxygen index value for the CR/BR/Fe2O3, CR/BR/Fe3O4 and CR/BR/Ag2O vulcanizates compared to the standard cross-linked chloroprene rubber showed that presented metal oxides provided a positive effect on the resistance to flame of the new CR/BR/MeO composites. Satisfactory properties of the studied blends are related to the presence of the interelastomer bonding of both rubbers in the compositions.

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