Surface tension and surface entropy for polymer liquids

Ness, K. E. Van

doi:10.1002/pen.760320208

Cited by 8 publications

(8 citation statements)

References 22 publications

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“…Finding a suitable adhesive for low surface energy materials is still such a challenge, because most polymers in adhesives have a similar low surface energy and hence the thermodynamic work of adhesion is low. Note that the surface energy of PPO is in the range of 28 to 34 mJ m -2 at room temperature [27,28], which is close to the value for the PP probe [29]. In contrast, the surface energy of PEO is higher (41 to 44 mJ m -2 ) [28,30].…”

Section: Analysis Of Waterborne Poly(urethane-urea)ssupporting

confidence: 68%

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Optimization of adhesive performance of waterborne poly(urethane-urea)s for adhesion on high and low surface energy surfaces

Díez-García

Keddie

Eceiza

et al. 2020

Progress in Organic Coatings

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Section: Analysis Of Waterborne Poly(urethane-urea)ssupporting

confidence: 68%

“…Note that the surface energy of PPO is in the range of 28 to 34 mJ m -2 at room temperature [27,28], which is close to the value for the PP probe [29]. In contrast, the surface energy of PEO is higher (41 to 44 mJ m -2 ) [28,30]. The inclusion of PEO in a polymer could be advantageous to adhesion.…”

Section: Analysis Of Waterborne Poly(urethane-urea)ssupporting

confidence: 64%

Optimization of adhesive performance of waterborne poly(urethane-urea)s for adhesion on high and low surface energy surfaces

Díez-García

Keddie

Eceiza

et al. 2020

Progress in Organic Coatings

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“…The metallocene polyethenes available to us did not form a droplet in a reasonable time scale. So values of the surface tension of polyethenes synthesized by heterogeneous catalysts are taken from the literature, and they are added to Figure . ,, An exponential decay for the surface tension with increasing amount of 1-butene in the random copolymer can be fitted. Negative deviations from additivity can be explained theoretically, and they are enhanced with differences of the molar volumes of the respective monomer units of the random copolymer .…”

Section: Resultsmentioning

confidence: 99%

Surface Tension Measurements on Ethene−Butene Random Copolymers and Different Polypropenes

et al. 2000

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The pendant drop apparatus is used in order to study the surface tension of ethene-1butene random copolymer melts over the whole range of compositions, including poly(1-butene) (P-1-B) and at different temperatures. Furthermore, the surface tensions of isotactic polypropene (i-PP) and syndiotactic polypropene (s-PP) are measured. The surface tension of the melt of random copolymers decreases as a function of copolymer composition from pure polyethene (PE) to pure P-1-B in a nearly exponential manner, and the surface tensions of copolymers with a P-1-B content in the range of approximately 40 wt % match the surface tension of i-PP and s-PP. This indicates the possible existence of a window of miscibility. This result is verified by the calculation of the solubility parameters from additional sessile drop measurements on solid copolymers at room temperature and from pressurevolume-temperature data of the melts applying the Flory-Orwoll-Vrij equation-of-state theory. Also, the theory of the conformational parameter β (Bates and Fredrickson) leads to the same conclusion. All results are consistent with microscopic observations discussed in the literature.

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“…The aforementioned particles properties are provided in Table 1. As an example the average surface energy of the PEG is 0.043 J/m 2 [27][28][29] mostly measured by the contact angle method. Using this value, the Cohesion number, shown in equation (7), is then calculated to be 0.316 and keeping this value constant, the equivalent surface energy to be used in DEM with larger particles and softer material is 2.1 J/m 2 .…”

Section: Geometry and Materials Properties Of The Particlesmentioning

confidence: 99%

An investigation on process of seeded granulation in a continuous drum granulator using DEM

Behjani

Rahmanian

Ghani

et al. 2017

Advanced Powder Technology

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Numerical simulation of wet granulation in a continuous granulator is carried out using Discrete Element Method (DEM) to discover the possibility of formation of seeded granules in a continuous process with the aim of reducing number of experimental trials and means of process control. Simple and scooped drum granulators are utilized to attain homogenous seeded granules in which the effects of drum rotational speed, particles surface energy, and particles size ratio are investigated. To reduce the simulation time a scale-up scheme is designed in which a dimensionless number (Cohesion number) is defined based on the work of cohesion and gravitational potential energy of the particles. Also a mathematical/numerical method along with a MATLAB code is developed by which the percentage of surface coverage of each granule is predicted precisely. The results show that use of continuous granulator is promising provided that a high level of shear is considered in the granulator design, i.e. using baffles inside drum granulators is essential for producing seeded granules. It is observed that the optimum surface energy for seeded granulation in scooped granulator (used in this study) with rotational speed of 50 rpm is 3 J/m 2 , which is close to the value predicted by the concept of Cohesion number.It is also shown that increasing the seed/fine size ratio enhances the seeded granulation both quantitatively (60% increase in seeds surface coverage) and qualitatively (more homogeneous granules).

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Surface tension and surface entropy for polymer liquids

Cited by 8 publications

References 22 publications

Optimization of adhesive performance of waterborne poly(urethane-urea)s for adhesion on high and low surface energy surfaces

Optimization of adhesive performance of waterborne poly(urethane-urea)s for adhesion on high and low surface energy surfaces

Surface Tension Measurements on Ethene−Butene Random Copolymers and Different Polypropenes

An investigation on process of seeded granulation in a continuous drum granulator using DEM

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