The transparency of polyurethane-poly(methyl methacrylate) interpenetrating and semi-interpenetrating polymer networks

Jehl, D.; Widmaier, Jean‐Michel; Meyer, G. C.

doi:10.1016/0014-3057(83)90184-2

Cited by 14 publications

(3 citation statements)

References 5 publications

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“…The transmittance phenomenon highly depends upon the crosslink density of the polymer. The higher transparency of the coating was ascribed to the better crosslinking of the copolymer whereas the lower crosslink density resulted in a lower degree of transparency in the PU coating 19–20 . Sun et al 21 reported that the irregularity of the polymer chain due to weak intermolecular force resulted in the formation of the amorphous state that provides better transparency to the PU coatings.…”

Section: Resultsmentioning

confidence: 99%

“…The higher transparency of the coating was ascribed to the better crosslinking of the copolymer whereas the lower crosslink density resulted in a lower degree of transparency in the PU coating. [19][20] Sun et al 21 reported that the irregularity of the polymer chain due to weak intermolecular force resulted in the formation of the amorphous state that provides better transparency to the PU coatings. Hence, as observed from the test results reported in Table 3, the coatings aePU-5 and aePU-6 at AP:EP ratio of 60:40 and 50:50 exhibited optimum performance.…”

Section: Haze and Luminous Transmittancementioning

confidence: 99%

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Acrylic‐ester‐polyol based novel two‐component polyurethane clear coat: Evaluation of performance characteristics

Mohanty

Nayak

2021

J of Applied Polymer Sci

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In the current study, a combination of acrylic polyol (AP) and ester polyol (EP) were synthesized and reacted at variable ratios with hexamethylene diisocyanates and isophorone diisocyanates to prepare a transparent two‐component polyurethane (PU) coating formulation. The formations of the polyol system, isocyanate system, and the PU systems were confirmed by 1H nuclear magnetic resonance and Fourier‐transform infrared spectroscopy. Transparency of the coatings was examined using haze, and gloss measurement, which showed acrylic‐ester‐polyurethane (aePU‐5 and aePU‐6) have 91.5% and 91.8% transparency and gloss of 90.3 and 90.7 GU respectively. The thermal properties like Tg and the thermal stability of the coatings were verified using differential scanning calorimetry, and thermogravimetric analysis respectively which was found to increase with increasing EP content and decreasing AP content which may be ascribed to improved compatibility of copolymers, and homogeneity in PU along with enhanced crosslinking density. The degree of adhesion of coating with the substrate was validated from lap‐shear, and cross‐cut tape test which showed improved performance at AP:EP ratio of 60:40. The coatings were found to exhibit resistance toward pencil hardness with aePU‐5 and aePU‐6 having the optimum resistance of 9H. The surface morphology and topography were observed under scanning electron microscopy, and atomic force microscopy, respectively. The outcome confirms the higher smoothness of the surfaces subjected to the increase in EP content. The PU system with 40 wt% AP content and 60 wt% EP designated as aePU‐5 was found to exhibit optimum performance.

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Section: Resultsmentioning

confidence: 99%

Section: Haze and Luminous Transmittancementioning

confidence: 99%

Acrylic‐ester‐polyol based novel two‐component polyurethane clear coat: Evaluation of performance characteristics

Mohanty

Nayak

2021

J of Applied Polymer Sci

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“…They gave also the synthesis procedure with consideration of the effect of composition parameters on synthesis and the effect of kinetics of network formation. Then they studied the physical characteristics [7], transition behaviour [8], some mechanical properties like the stress-strain relations and impact resistance [9], as well as the transparency behaviour [10]. They established the effect of various composition parameters, temperature and degree of crosslinking etc.…”

Section: Introductionmentioning

confidence: 99%

Ultrasonic investigation of interpenetrating networks of poly(methyl methacrylate) and polyurethane

Sudhakar

Singh

1987

Rheol Acta

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Interpenetrating networks are the most recent development in polymeric blend materials. Due to the crosslinking of both the continuous and dispersed phases, a high degree of molecular mixing is achieved in these materials. Notwithstanding that poly(methyl methacrylate)-polyurethane (PMMA-PUR) interpenetrating and semi-interpenetrating networks have been extensively investigated by Meyer et al., ultrasonic relaxation technique has been applied here for the first time. These materials were found to be highly ultrasound absorbing.It is observed that ultrasonic absorption has a peak at a particular composition of PMMA-PUR interpenetrating network. The absorption coefficient c< increases with frequency f The absorption is of relaxational nature and is not due to the scattering of ultrasonic waves by the domains of the dispersed phase. At every composition of the interpenetrating network, the c~/f 2 vs. f curve indicates the presence of a relaxation frequency below 2 MHz and that the absorption increases with the temperature at some compositions which indicates the presence of thermal relaxation. An attempt is made to relate the absorption with the relaxation of pendent groups of polyurethane in the continuous phase.

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Interpenetrating polymer networks based on thermoplastic polyurethanes (TPUS) and cis‐1,4‐polyisoprene

Mishra

Murphy

Sperling

1994

J of Applied Polymer Sci

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SYNOPSISSemi-interpenetrating polymer networks based on two elastomers, cis-1,4-polyisoprene (PI) and thermoplastic polyurethane elastomers ( TPUs ) were prepared in varying compositions. The PI component was cross-linked using peroxide initiators. Modulus and mechanical properties were investigated as a function of composition and temperature. Slight synergisms were observed in mechanical properties, particularly for compositions containing 10% PI by weight. Little or no molecular mixing is shown by differential scanning calorimetry (DSC) for these two-phase materials.

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The transparency of polyurethane-poly(methyl methacrylate) interpenetrating and semi-interpenetrating polymer networks

Cited by 14 publications

References 5 publications

Acrylic‐ester‐polyol based novel two‐component polyurethane clear coat: Evaluation of performance characteristics

Acrylic‐ester‐polyol based novel two‐component polyurethane clear coat: Evaluation of performance characteristics

Ultrasonic investigation of interpenetrating networks of poly(methyl methacrylate) and polyurethane

Interpenetrating polymer networks based on thermoplastic polyurethanes (TPUS) and cis‐1,4‐polyisoprene

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