Novel polyethylene‐<i>b</i>‐polyurethane‐<i>b</i>‐polyethylene triblock copolymers: Facile synthesis and application

Xu, Zhixian; Liu, Yulu; Guo, Song; Jie, Suyun; Li, Bo‐Geng

doi:10.1002/app.42967

Cited by 5 publications

(5 citation statements)

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“…However, because of the interchain attraction in the castor oil molecules, the melting point was very weak compared to that of the soybean oil. 24,25 At the same time, this reflected on the polymerization degree because the residual melting peak in the castor oil PU was very low compared to that of the soybean oil PU. These findings were in accordance with the NMR experiments, which indicated a higher polymerization degree in the castor oil PU sample.…”

Section: Resultsmentioning

confidence: 95%

“…The same behavior was observed in the soybean oil sample (melting temperature = −5.4 °C) and related PU (−4 °C); in both cases, it showed a possible residual oil (nonpolymerized) on the PU samples. However, because of the interchain attraction in the castor oil molecules, the melting point was very weak compared to that of the soybean oil . At the same time, this reflected on the polymerization degree because the residual melting peak in the castor oil PU was very low compared to that of the soybean oil PU.…”

Section: Resultsmentioning

confidence: 99%

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Controlled release of nitrogen‐source fertilizers by natural‐oil‐based poly(urethane) coatings: The kinetic aspects of urea release

Bortoletto-Santos

Ribeiro

Polito

2016

J of Applied Polymer Sci

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Urea is the most common source of nitrogen fertilizer, but it has serious disadvantages with respect to volatilization and leaching; these can be controlled by polymeric coatings on the granules. However, the effectiveness of this strategy depends on the formed polymer presenting good adhesion, reactivity with the urea surface, uniformity, and efficient release kinetics control. Therefore, in this study, we evaluated the release kinetics of urea coated by polyurethane produced from two oils (soybean and castor) by analyzing the influence of the thickness, coating stability, deposition interface, and total release time. The results demonstrate that castor oil produced superior materials, which achieved a total release time in water immersion of over 40 days with a total coating mass of less than 4% of the total mass. The good interface suggested that this material may produce coatings of good quality and long release times with minimum thickness, and this will maximize the total nitrogen present in the granule. V C 2016 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2016, 133, 43790.

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Section: Resultsmentioning

confidence: 95%

Section: Resultsmentioning

confidence: 99%

Controlled release of nitrogen‐source fertilizers by natural‐oil‐based poly(urethane) coatings: The kinetic aspects of urea release

Bortoletto-Santos

Ribeiro

Polito

2016

J of Applied Polymer Sci

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“…In contrast, the crystallization, hydrophobicity, and inertness of polyolefins can ameliorate the mechanical strength, thermal stability, and hydrolysis resistance of PUs. Xu et al prepared polyethylene (PE) with one hydroxyl group per chain via the thiol–ene addition reaction and synthesized the triblock copolymer (PE- b -PU- b -PE) via a coupling reaction. Ye and Li synthesized monohydroxy-terminated PP and PE using ZnEt 2 as a chain-transfer agent followed by oxidization.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and Characterization of Polypropylene-Based Polyurethanes

Jiang

Wang

et al. 2020

Macromolecules

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A novel multiblock copolymer, polypropylene (PP)-based polyurethane (PU) (PbPU), has been successfully synthesized. Dihydroxyl end-capped macromonomers, prepared from the pyrolysis product of commercial PP followed by hydroxylation, reacted with polytetrahydrofuran (PTMEG) via a coupling reaction between the hydroxyl and isocyanate groups, to obtain multiblock copolymers with PP and PU segments. Here, a cheap and practical hydroxylation route using in situ generated amino borane was first applied for the functionalization of PP on a large scale, which was proven to be of high efficiency by 1H NMR measurement. PbPU copolymers with different compositions were prepared. The microstructure and basic properties of the resultant copolymers were studied by differential scanning calorimetry (DSC), atomic force microscopy (AFM), small-angle X-ray scattering (SAXS), and mechanical testing. The PbPU copolymers presented excellent compatibilization for PP/PU blends, in which a significant enhancement in the interface adhesion and an improvement of mechanical properties can be achieved, regardless of the composition of the blends. Moreover, it is expected that the PbPUs can be used as a “versatile compatibilizer” for PP/polar polymer blends, considering that the PU segments in the copolymer show miscibility with many polar polymers, such as PP/poly(methyl methacrylate) (PMMA), PP/poly(vinyl chloride) (PVC), PP/poly(vinylidene difluoride) (PVDF), etc.

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“…Therefore, the functionalization of polyolefins has attracted increasing attention over the past few years. Three main approaches are generally used for the preparation of terminally functionalized polyolefins, (1) chemical modification of preformed polyolefins with unsaturated chain ends, (2) in situ chain transfer polymerization, and (3) selective end‐capping of living polymerization. The poor solubility of polyolefins, complicated synthetic procedures, special catalytic systems, or harsh reaction conditions has hindered the development of these methods.…”

Section: Introductionmentioning

confidence: 99%

Facile access to carboxyl‐terminated polybutadiene and polyethylene fromcis‐polybutadiene rubber

Dai

Wang

et al. 2018

J of Applied Polymer Sci

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Carboxyl-terminated polybutadiene (CTPB) is a widely used telechelic liquid rubber, which is mainly prepared by anionic or free-radical polymerization of 1,3-butadiene. It is known that the microstructure of liquid polybutadiene rubber largely affects its processability and mechanical properties. However, it is hard to control its microstructure in the free radical or anionic polymerization. In this study, a series of CTPB with high cis-1,4 content has been prepared for the first time via the oxidolysis and selective oxidation of cis-polybutadiene rubber (BR). Hydrogenation of their C C double bonds with p-toluenesulfonyl hydrazide/tri-n-propylamine (TSH/TPA) reagents afforded carboxyl-terminated polyethylenes (CTPE). For comparison, commercial CTPB (FCTPB), prepared by free-radical polymerization of 1,3-butadiene, was also hydrogenated and gave FCTPE with more ethyl branches. Linear CTPE (L-CTPE) was synthesized by ring-opening metathesis polymerization of 1,5-cyclooctadiene in the presence of maleic acid and subsequent hydrogenation. The microstructure of the polymers was established by FT-IR, 1 H NMR, 13 C NMR, and GPC and their thermal properties were determined by DSC and TGA.

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Novel polyethylene‐b‐polyurethane‐b‐polyethylene triblock copolymers: Facile synthesis and application

Cited by 5 publications

References 50 publications

Controlled release of nitrogen‐source fertilizers by natural‐oil‐based poly(urethane) coatings: The kinetic aspects of urea release

Controlled release of nitrogen‐source fertilizers by natural‐oil‐based poly(urethane) coatings: The kinetic aspects of urea release

Synthesis and Characterization of Polypropylene-Based Polyurethanes

Facile access to carboxyl‐terminated polybutadiene and polyethylene fromcis‐polybutadiene rubber

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