Synthesis and characterization of low- and medium-molecular-weight hyperbranched polyethylenes by chain walking ethylene polymerization with Pd–diimine catalysts

Xiang, Peng; Ye, Zhibin; Subramanian, R.

doi:10.1016/j.polymer.2011.09.010

Cited by 39 publications

(45 citation statements)

References 37 publications

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“…A series of highly branched polyethylenes (BPE), polyoctene, and their respective copolymers were prepared following published procedures. [10,[12][13][14][15] Olefins (i.e., ethylene, octene, and undecenoic methyl ester) were combined with a palladium diimine catalyst in dichloromethane (Table 1). In the experiments where ethylene was utilized, a Parr apparatus was employed in which the pressure was either varied (100↓) with an initial charge of 100 psi or held constant Our early attempts produced fairly ineffective viscosity modifiers due to relatively low ethylene incorporation and low molecular weights.…”

Section: Resultsmentioning

confidence: 99%

Highly branched polyethylenes as lubricant viscosity and friction modifiers

Robinson

Zhou

et al. 2016

Reactive and Functional Polymers

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A series of highly branched polyethylenes (BPE) were prepared and evaluated in a Group I base oil as potential viscosity and friction modifiers. The performance of these BPEs supports the expected dual functionality. Changes in polarity, topology, and molecular weight of the BPEs showed significant effects on the lubricants' performance with respect to viscosity index and friction reduction. This study provides scientific insights into polymer design for future lubricant development activities.

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Section: Resultsmentioning

confidence: 99%

Highly branched polyethylenes as lubricant viscosity and friction modifiers

Robinson

Zhou

et al. 2016

Reactive and Functional Polymers

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“…First, similar to other polyethylene derivatives, BPE is non-toxic, synthetically tunable, and commercially available. Second, this low-molecularweight liquid compound has relatively low viscosity at room temperature, is miscible with common organic solvents (easily processed through solution deposition), [20] and shows a high affinity for carbon-rich materials through non-specific supramolecular interactions. [21,22] Notably, previous studies of BPE in organic electronics showed that utilization of BPE as an additive for the solution processing of semiconducting polymers can significantly impact the optoelectronic and thermomechanical properties of semiconducting polymers.…”

Section: Introductionmentioning

confidence: 99%

From Chlorinated Solvents to Branched Polyethylene: Solvent‐Induced Phase Separation for the Greener Processing of Semiconducting Polymers

Ocheje

Mechael

et al. 2021

Adv Elect Materials

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Despite having favorable optoelectronic and thermomechanical properties, the wide application of semiconducting polymers still suffers from limitations, particularly with regards to their processing in solution which necessitates toxic chlorinated solvents due to their intrinsic low solubility in common organic solvents. This work presents a novel greener approach to the fabrication of organic electronics without the use of toxic chlorinated solvents. Low‐molecular‐weight non‐toxic branched polyethylene (BPE) is used as a solvent to process diketopyrrolopyrrole‐based semiconducting polymers, then the solvent‐induced phase separation (SIPS) technique is adopted to produce films of semiconducting polymers from solution for the fabrication of organic field‐effect transistors (OFETs). The films of semiconducting polymers prepared from BPE using SIPS show a more porous granular morphology with preferential edge‐on crystalline orientation compared to the semiconducting polymer film processed from chloroform. OFETs based on the semiconducting films processed from BPE show similar device characteristics to those prepared from chloroform without thermal annealing, confirming the efficiency and suitability of BPE to replace traditional chlorinated solvents for green organic electronics. This new greener processing approach for semiconducting polymers is potentially compatible with different printing techniques and is particularly promising for the preparation of porous semiconducting layers and the fabrication of OFET‐based electronics.

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“…[14,18] The hyperbranched and dendritic polyethylenes possess extensive branch-on-branch structures, leading to a three-dimensional compact topology. [19][20][21][22] Actually, the hyperbranched polyethylenes (HBPEs) are the mimics of dendritic polyethylenes, which resemble the spherical morphology of dendritic polyethylenes but have more structural defects. [14] As a result, there are almost no long linear structures along the backbone of HBPEs, which are crucial to the crystallization behavior.…”

Section: Introductionmentioning

confidence: 99%