Effect of the Microstructure of a <i>Hyperbranched</i> Polymer and Nanoclay Loading on the Morphology and Properties of Novel Polyurethane Nanocomposites

Maji, Pradip K.; Guchhait, Prasanta K.; Bhowmick, Anil K.

doi:10.1021/am800020k

Cited by 80 publications

(54 citation statements)

References 57 publications

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“…By applying a slight pressure, a releasable bond to the substrate is formed (1)(2)(3)(4)(5)(6)(7)(8)(9)(10)(11). In many PSA applications, a controlled release of the adhesive bond is desired, making use of the ability to undergo several cycles of bonding and detaching.…”

Section: Introductionmentioning

confidence: 99%

Near-Surface Composition Profiles and the Adhesive Properties of Statistical Copolymer Films Being Model Systems of Pressure Sensitive Adhesive Films

Diethert

Peykova

Willenbacher

et al. 2010

ACS Appl. Mater. Interfaces

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Statistical copolymer films that consist of two types of monomers, a sticky and a glassy monomer, are investigated. These model systems of pressure-sensitive adhesive films are probed with X-ray reflectivity and mechanical tack measurements. For the first time, composition profiles along the surface normal in the near-surface region are monitored. The influence of the type of monomers being copolymerized, the monomer ratio, and the sample age on the near-surface composition as well as the resulting adhesive performance of the films are analyzed. The copolymers contain ethylhexyl acrylate as the majority component and styrene, maleic acid anhydride, or methylmethacrylate as a minority component. Regardless of the composition, we find a surface enrichment of one component in all samples. In the case of freshly prepared samples, this enrichment is driven by solubility due to the preparation based on solution casting. The minimization of the surface free energy results in an internal reorganization and the component of the statistical copolymer with the lower surface tension enriches at the free surface. The mechanical behavior is not dominated by the surface but by the surface-near part of the composition profile.

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Section: Introductionmentioning

confidence: 99%

Near-Surface Composition Profiles and the Adhesive Properties of Statistical Copolymer Films Being Model Systems of Pressure Sensitive Adhesive Films

Diethert

Peykova

Willenbacher

et al. 2010

ACS Appl. Mater. Interfaces

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“…This is mainly attributed to the improved adhesion between the polymer matrix and nanoparticles (Van der Waals interaction between PS and CdS nanoparticles, which is confirmed from the FTIR spectra). As a result of this improved adhesion, the nanoparticles can restrict the segmental motion near the organic–inorganic interface [49–52]. It is also observed that T g increases with the addition of CdS nanoparticles up to 4 wt% into the PS matrix and decreases for 6 and 8 wt% of CdS nanoparticles.…”

Section: Resultsmentioning

confidence: 99%

Study on glass transition temperature and mechanical properties of cadmium sulfide/polystyrene nanocomposites

Agarwal

Patidar

Saxena

2012

Polymer Engineering & Sci

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The cadmium sulfide/polystyrene (CdS/PS) nanocomposites with concentration (0, 2, 4, 6, and 8) wt% of CdS nanoparticles were prepared by solution casting method and characterized through fourier transform infrared spectroscopy (FTIR) and transmission electron microscopy (TEM) measurements. The particle size of nanoparticles is found to be around 15 nm. Glass transition and mechanical behavior of CdS/PS nanocomposites were investigated using dynamic mechanical analyzer (DMA). The mechanical properties such as Young's modulus and tensile strength were determined at room, as well as at elevated temperatures through their stress-strain curves. The result shows that glass transition temperature (T g ) is shifted toward the higher temperature after the addition of CdS nanoparticles. The mechanical properties increased at low wt% loading of CdS nanoparticles and decreased for higher wt% loading of CdS nanoparticles. It was also found that mechanical properties decline with increase in the temperature. POLYM. ENG. SCI

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“…Again, the high aspect ratio and large surface area of the nanoclay contributed to the adhesion between the polymer molecules and the OMMT layers. As a result, the reinforcing phase of the nanocomposite was efficient at bearing high stress 25 and contributed to the improvement in tensile strength. Motion of the polymer chains was effectively constrained because of stronger interactions between OMMT layers and the polymer molecules associated with a larger contact surface.…”

Section: Performance Characteristics Of the Nanocompositesmentioning

confidence: 99%

Hyperbranched polyether core containing vegetable oil-modified polyester and its clay nanocomposites

Konwar

Karak

2011

Polym J

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Mesua ferrea L. seed oil-modified polyester with hyperbranched polyether core was prepared by the polycondensation technique, which involved carboxyl-terminated prepolymer of the monoglyceride of the oil, phthalic anhydride and maleic anhydride; hydroxyl of bisphenol-S and hyperbranched polyol of bisphenol-A and cyanuric chloride. The nanocomposites of this hyperbranched polyester with 0-5 wt% nanoclay were prepared by an ex situ solution technique using strong mechanical shear force and ultrasonication. The degree of dispersion of the nanoclay in the polyester matrix and the resulting morphologies of nanocomposites were evaluated using X-ray diffraction, scanning electron microscopy and transmission electron microscopy. The studies revealed well-dispersed, intercalated or partially exfoliated nanocomposites. The effect of nanoclay on the mechanical, thermal and rheological behaviors of the nanocomposites was investigated. In the nanocomposite with 5 wt% nanoclay, the tensile strength was doubled, the scratch hardness value was improved by 2 kg and the thermal degradation temperature was improved by 37 1C when compared with the pristine polyester system. All results showed the potentiality of the prepared nanocomposites to be used as an advanced material. INTRODUCTIONEcological issues surrounding the development of new materials, the waste disposal of these materials and the exhaustion of non-renewable resources have increased the demand for renewable resources in industrial applications in contemporary times. 1 Interesting research has been performed to substitute petroleum-based polymers with more innovative materials that can compete or even surpass the existing petroleum-based materials in terms of cost-performance and environmental friendliness. 2 Natural vegetable oils are expected to be an ideal alternative chemical feedstock because of their many advantages, such as physical and chemical stability, aptitude to facile chemical modification, reduced toxicity, reduced risk for handling and transportation, possibility of recycling, renewability and biodegradability, and at the same time are available in large quantities at relatively low and stable prices, as well as susceptible to agricultural diversification and are environmentally benign in nature. These inexpensive triglycerides of fatty acids have been utilized extensively in various applications, such as coatings, inks, plasticizers, lubricants, resins and agrochemicals. 3 However, conventional oil-based polymeric materials do not show the rigidity and strength for structural applications; 4 hence, there is an urgent need to design a polymer from vegetable oils with a unique architectural structure.Hyperbranched polymers are highly branched macromolecules with three-dimensional dendritic structures. They are the focus of

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Effect of the Microstructure of a Hyperbranched Polymer and Nanoclay Loading on the Morphology and Properties of Novel Polyurethane Nanocomposites

Cited by 80 publications

References 57 publications

Near-Surface Composition Profiles and the Adhesive Properties of Statistical Copolymer Films Being Model Systems of Pressure Sensitive Adhesive Films

Near-Surface Composition Profiles and the Adhesive Properties of Statistical Copolymer Films Being Model Systems of Pressure Sensitive Adhesive Films

Study on glass transition temperature and mechanical properties of cadmium sulfide/polystyrene nanocomposites

Hyperbranched polyether core containing vegetable oil-modified polyester and its clay nanocomposites

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