New Polyurethane Sealants Containing Rosin for Non-Invasive Disc Regeneration Surgery

2013 ◽  
Vol 583 ◽  
pp. 67-79 ◽  
Author(s):  
Pilar Carbonell-Blasco ◽  
Iulian Antoniac ◽  
Jose Miguel Martin-Martinez
Keyword(s):  
Peel Test ◽  
Peel Strength ◽  
Chain Extender ◽  
Polymer Chains ◽  
Scanning Calorimetry ◽  
Disc Regeneration ◽  
Non Invasive ◽  
Lap Shear ◽  
Chain Extenders ◽  
Butane Diol

Different polyurethane sealants were prepared by reacting methylene dyísocyanate and polyadipate of 1,4 butane diol (Mw : 2500 daltons) by using the prepolymer method and different mixtures of rosin and 1,4 butane diol were used as chain extenders. The polyurethanes were characterized by plate-plate rheology, molecular weight distribution, Differential Scanning Calorimetry (DSC), and Laser Confocal Microscopy. The tack of the polyurethanes sealants was obtained by using a modified probe tack method, and their adhesion was obtained by T-peel test of leather/polyurethane sealant/leather joints and by single lap-shear tests of aluminium/polyurethane sealant/aluminium joints. Depending on the rosin content in the chain extender the structure of the polyurethanes was different, i.e. more urethane and urethane-amide hard segments were created up to 50 eq% rosin in the chain extender, and separation of domains was prevailing in the polyurethanes with higher rosin content. Furthermore, the addition of rosin caused an increase in the length of the polymer chains and in the storage modulus (particularly in the polyurethane containing 50 eq% rosin), and decrease in the melting enthalpy. Moreover, the crystallinity of the polyurethanes containing up to 50 eq% rosin showed lower number and smaller spherulites, Finally, the tack at 37 °C and the peel strength increased in the joints made with the polyurethane sealants containing rosin whereas the adhesive shear strength decreased when the polyurethane sealant contained 50 eq% rosin or less.

scholarly journals New Waterborne Polyurethane-Urea Synthesized with Ether-Carbonate Copolymer and Amino-Alcohol Chain Extenders with Tailored Pressure-Sensitive Adhesion Properties

Materials ◽  
2020 ◽  
Vol 13 (3) ◽  
pp. 627 ◽  
Author(s):  
Mónica Fuensanta ◽  
Abbas Khoshnood ◽  
Francisco Rodríguez-Llansola ◽  
José Miguel Martín-Martínez
Keyword(s):  
Amino Alcohol ◽  
Peel Test ◽  
Waterborne Polyurethane ◽  
Chain Extender ◽  
Gravimetric Analysis ◽  
Scanning Calorimetry ◽  
Adhesion Properties ◽  
Oh Groups ◽  
Pressure Sensitive ◽  
Chain Extenders

New waterborne polyurethane-urea dispersions with adequate adhesion and cohesion properties have been synthesized by reacting isophorone diisocyanate, copolymer of ether and carbonate diol polyol and three amino-alcohols with different number of OH groups chain extenders using the prepolymer method. The waterborne polyurethane-urea dispersions were characterized by pH, particle-size distribution, and viscosity, and the polyurethane-urea films were characterized by attenuated total reflectance infrared (ATR-IR) spectroscopy, differential scanning calorimetry (DSC), thermal gravimetric analysis (TGA), and plate-plate rheology (temperature and frequency sweeps). Polyurethane-urea pressure-sensitive adhesives (PUU PSAs) were prepared by placing the waterborne polyurethane dispersions on polyethylene terephthalate (PET) films and they were characterized at 25 °C by creep test, tack and 180° peel test. The waterborne polyurethane-urea dispersions showed mean particle sizes between 51 and 78 nm and viscosities in the range of 58–133 mPa·s. The polyurethane-urea films showed glass transition temperatures (Tgs) lower than −64 °C, and they showed a cross of the storage and loss moduli between −8 and 68 °C depending on the number of OH groups in the amino-alcohol chain extender. Different types of PUU PSAs (removable, high shear) were obtained by changing the number of OH groups in the amino-alcohol chain extender. The tack at 25 °C of the PUU PSAs varied between 488 and 1807 kPa and the 180° peel strength values ranged between 0.4 and 6.4 N/cm, and their holding times were between 2 min and 5 days. The new PUU PSAs made with amino-alcohol chain extender seemed very promising for designing environmentally friendly waterborne PSAs with high tack and improved cohesion and adhesion property.

scholarly journals Influence of biobased polyol type on the properties of polyurethane hotmelt adhesives for footwear joints

2021 ◽  
Vol 9 (1) ◽  
Author(s):  
M. P. Carbonell-Blasco ◽  
M. A. Pérez-Limiñana ◽  
C. Ruzafa-Silvestre ◽  
F. Arán-Ais ◽  
E. Orgilés-Calpena
Keyword(s):  
Raw Materials ◽  
Peel Test ◽  
Softening Temperature ◽  
Peel Strength ◽  
Adhesion Test ◽  
Scanning Calorimetry ◽  
Final Performance ◽  
Footwear Industry ◽  
Polyurethane Adhesives ◽  
Useful Life

AbstractPolyurethanes, one of the most used polymers worldwide, are strongly dependent of non-renewable fossil resources. Thus, boosting the production of new polyurethanes based on more sustainable raw materials is crucial to move towards the footwear industry decarbonisation. The aim of this study is to synthesise and characterise reactive hotmelt polyurethanes from biomass and CO2-based polyols as bioadhesives for the footwear industry. The influence of biobased polyols on the polyurethane structure, and therefore, on their final properties was analysed by different experimental techniques such us Fourier transform infrared spectroscopy (FTIR), Differential scanning calorimetry (DSC), Thermogravimetric analysis (TGA), Melting viscosity, Softening temperature and T-peel strength test, in order to assess their viability for the upper to sole bonding process. The results obtained indicated that the incorporation of different amounts of the biobased polyols produces changes in the structure and final performance of the polyurethanes. Therefore, adhesion test carried out by the T-peel test 72 h after the upper -to- sole bonding of the sustainable adhesives show high final adhesion values. These sustainable raw materials provide polyurethane adhesives with additional beneficial non-toxicity and sustainable characteristics, without harming their properties during their useful life.

Study on thermal properties of polyurethane-urea elastomers prepared with different dianiline chain extenders

2013 ◽  
Vol 33 (1) ◽  
pp. 87-94 ◽  
Author(s):  
Majid Barikani ◽  
Naghmeh Fazeli ◽  
Mehdi Barikani
Keyword(s):  
Thermal Properties ◽  
Chain Extender ◽  
Polymerization Reaction ◽  
Dsc Analysis ◽  
Scanning Calorimetry ◽  
Polymer Characterization ◽  
Cast Films ◽  
Mechanical Measurements ◽  
Chain Extenders ◽  
Thermal Stability Of

Abstract A number of polyurethane prepolymers based on polycaprolactone diol (PCL) and 4,4′-diphenyl methane diisocyanate (MDI) were synthesized and extended with different dianilines such as: 4,4′-methylenebis(2,6-diisopropylaniline) (M-DIPA), 4,4′-methylenebis(2,6diethylaniline) (M-DEA), 4,4′-methylenebis(ortho chloroaniline) (MOCA), 4,4′-methylenebis(2-isopropyl-6-methylaniline) (M-MIPA) and 4,4′-methylenebis(3-chloro-2,6-diethylaniline) (M-CDEA). Infrared (IR) spectroscopy was used to check the end of the polymerization reaction in addition to the polymer characterization. The effect of the dianiline structure on the thermal properties of the cast films were studied through dynamic mechanical measurements (DMTA), thermogravimetric analysis (TGA) and differential scanning calorimetry (DSC) analysis. It was found that the thermal properties and thermal stability of polyurethane are strongly affected by the molecular structure of the dianiline chain extender.

scholarly journals Copolymerization of Styrene and Pentadecylphenylmethacrylate (PDPMA): Synthesis, Characterization, Thermomechanical and Adhesion Properties

Polymers ◽  
2020 ◽  
Vol 12 (1) ◽  
pp. 97
Author(s):  
Tomy Muringayil Joseph ◽  
Sumi Murali Nair ◽  
Suresh Kattimuttathu Ittara ◽  
Józef T. Haponiuk ◽  
Sabu Thomas
Keyword(s):  
Gel Permeation Chromatography ◽  
Complex Viscosity ◽  
Peel Strength ◽  
Morphological Characterization ◽  
Reactivity Ratio ◽  
Scanning Calorimetry ◽  
Adhesion Properties ◽  
Lap Shear ◽  
Hard Shell ◽  
Styrene Content

The copolymerization of styrene (St) with a bioderived monomer, pentadecylphenyl methacrylate (PDPMA), via atom transfer radical polymerization (ATRP) was studied in this work. The copolymerization reactivity ratio was calculated using the composition data obtained from 1H NMR spectroscopy, applying Kelen-Tudos and Finemann-Ross methods. The reactivity ratio of styrene (r1 = 0.93) and PDPMA (r2 = 0.05) suggested random copolymerization of the two monomers with alternation. The copolymerization conversion increased with increasing PDPMA concentration of the feed, upto 70 wt % PDPMA, but decreased thereafter. The molecular weight determined by gel permeation chromatography was lower than the theoretical values and the polydispersity increased from 1.32 to 2.19, with increasing PDPMA content in the feed. The influence of styrene content on the glass transition and thermal decomposition behavior of the copolymers was studied by differential scanning calorimetry (DSC) and thermogravimetric analysis, respectively. Morphological characterization by transmission electron microscopy (TEM) revealed a phase separated soft core-hard shell type structure. The complex viscosity and adhesion properties like peel strength and lap shear strength of the copolymer on different substrates increased with increasing styrene content.

Peel strength characterisation on ply/ply interface using wedge and T-peel/pull-type tests

2018 ◽  
Vol 26 (8-9) ◽  
pp. 431-445 ◽  
Author(s):  
Britto Satheesh ◽  
Maximilian Tonejc ◽  
Larissa Potakowskyj ◽  
Martin Pletz ◽  
Ewald Fauster ◽  
...  
Keyword(s):  
Material Properties ◽  
Peel Test ◽  
Peel Strength ◽  
Scanning Calorimetry ◽  
Material Interfaces ◽  
Consolidation Pressure ◽  
Peel Testing ◽  
Peel Force ◽  
Welding Properties

Thermoplastic tapes have found a prominent place in automated tape placement (ATP), due to their reduced processing time. ATP also offers significant reduction in labour; however, the most attractive aspect is the use of its welding properties. Welding or diffusion bonding is necessary for two thermoplastic materials to bond to each other through the combined effect of heating and consolidation pressure. The work published in this article shows how various thermoplastic tape materials with different material properties are bonded to each other using a direct flame-type ATP process. Contact angle and differential scanning calorimetry measurements help understanding of the processing needs of the considered materials. The samples obtained after ATP are sent for peel testing using a wedge peel test principle, so that the force required to separate the bonding is identified. A T-peel test/pull test is also employed to cross-compare peel results obtained through wedge peel testing. The main aim of the work is to study the quality of connection between the two plies with different material interfaces and also how friction might contribute to peel force when wedge peeling is used. A numerical model is also implemented to show the effects of this friction.

Heat-Sealing Properties of Compression-Molded Wheat Gluten Films

2007 ◽  
Vol 1 (1) ◽  
pp. 56-63 ◽  
Author(s):  
Sung-Woo Cho ◽  
Henrik Ullsten ◽  
Mikael Gällstedt ◽  
Mikael S. Hedenqvist
Keyword(s):  
Shear Strength ◽  
Wheat Gluten ◽  
Peel Test ◽  
Mold Temperature ◽  
Peel Strength ◽  
Minor Effect ◽  
Lap Shear Strength ◽  
Lap Shear ◽  
Heat Sealing ◽  
A Minor

The impulse heat-sealing properties of wheat gluten films were investigated. Films containing 30 wt% glycerol were compression molded at 100–130 °C and then sealed in a lap-shear or peel-test geometry at 120–175 °C. The tensile properties of the pristine films and the lap-shear and peel strength of the sealed films were evaluated and the seals were examined by scanning electron microscopy. Glycerol was added to the film surfaces prior to sealing in an attempt to enhance the seal strength. It was observed that the wheat gluten films were readily sealable. At a 120 °C sealing temperature and without glycerol as adhesive, the lap-shear strength was greater than or similar to that of polyethylene film, although the peel strength was poorer. The sealing temperature had a negligible effect on the lap-shear strength, but the peel strength increased with sealing temperature. The lap-shear strength increased with increasing mold temperature and the failure mode changed, especially in the absence of glycerol adhesive, from a cohesive (material failure) to an adhesive type. From previous results, it is known that the high-temperature (130 °C) compression-molded film was highly cross-linked and aggregated, and this prevents molecular interdiffusion and entanglement and thus leads to incomplete seal fusion and, in general, adhesive failure. The presence of glycerol adhesive had a beneficial affect on the peel strength but no, or only a minor, effect on the lap-shear strength.

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