Bimodal poly(ethylene-cb-propylene) comb block copolymers from serial reactors: Synthesis and applications as processability additives and blend compatibilizers

Tsou, Andy H.; López‐Barrón, Carlos R.; Jiang, Peng; Crowther, Donna J.; Zeng, Yiming

doi:10.1016/j.polymer.2016.09.088

Cited by 25 publications

(29 citation statements)

References 27 publications

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“…Comparing Figures and , most the HMW components in cbHDPE have more than five comb arms. Based on C nuclear magnetic resonance spectrum analysis, the cbHDPE has an average of 1.5 LCBs per 1000 carbons.…”

Section: Methodsmentioning

confidence: 99%

“…Using two catalysts simultaneously in a single solution reactor produces LCB HDPEs where the backbone and the comb branches have the same composition . Further enhancement in the branching level can be accomplished by a two‐step process where the first step is to produce and recover vinyl‐terminated polyolefin macromer and the second step is to copolymerize purified VTM with other monomers or by two reactors in series where the first reactor is used to synthesize VTM and the second reactor is employed to copolymerize VTM with other monomer(s) . For all these to work, it is critical to have a catalyst that favors beta‐hydride transfer during ethylene polymerization that can lead to vinyl chain ends at very high percentages, >95%.…”

Section: Introductionmentioning

confidence: 99%

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Processability‐enhanced bimodal high‐density polyethylene with comb‐branched high‐density polyethylene

Tsou

Doufas

Atienza

et al. 2017

J of Applied Polymer Sci

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Two solution reactors in series were utilized to synthesize comb‐branched high‐density polyethylene (HDPE), cbHDPE, where the first reactor prepares vinyl‐terminated HDPE macromers catalyzed by an organometallic catalyst favoring beta hydride transfer and the second reactor copolymerizes HDPE macromers with ethylene using a different organometallic catalyst capable of incorporating macromers. A bimodal HDPE, biHDPE with bimodalities in molecular weight, and hexene content of the desired composition distribution was also prepared in a gas phase reactor using silica supported dual organometallic catalysts. By blending 3% solution‐made cbHDPE into the gas‐phase biHDPE, the resulting trimodal HDPE preserves the excellent stiffness and toughness of the bimodal HDPE while having exceptional melt strength and processability. © 2017 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018, 135, 45755.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Processability‐enhanced bimodal high‐density polyethylene with comb‐branched high‐density polyethylene

Tsou

Doufas

Atienza

et al. 2017

J of Applied Polymer Sci

Self Cite

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“…To improve the impact properties, random copolymerized PP and block copolymerized PP have been synthesized. However, the complex synthetic process and uncontrollable ratio of monomers during synthesis limit the development of random copolymerized and block copolymerized PP . Meanwhile, the rigidity of isotactic homopolymer PP is higher than random copolymerized and block copolymerized PP which can be used in some special aspects .…”

Section: Introductionmentioning

confidence: 99%

A novel combination of sandwich and co‐continuous structure based on polypropylene and styrene‐butadiene‐styrene block copolymer formed with wide range of polypropylene content

Wang

Zhang

2018

J of Applied Polymer Sci

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The styrene-butadiene-styrene block copolymer (SBS)/polypropylene (PP) blends with a unique sandwich layered cocontinuous structure were prepared by melt compounding. Differing from single conventional co-continuous and sandwich structure, this structure was formed, where pure PP and co-continuous SBS/PP phase acting as the face sheets and core. Even though the volume content was 20 or 10 vol %, PP always amazingly formed a continuous phase in SBS/PP blends, whereas the morphology of SBS phase relatively changed from dispersed particles to continuous network as its content increased to 50 vol %. For immiscible SBS/PP blends, due to the huge difference of complex viscosity and surface tension between SBS and PP, a pure PP layer existed on the surface of blends which can be ascribed to the PP enrichment. Herein, the structure of blends with more than 50 vol % SBS was presented as sandwich layered co-continuous structure by combining the pure PP layer and co-continuous structure. V C 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018, 135, 46580.

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“…Polymer blending has become an important method to prepare novel materials with much better processability, chemical resistance, toughness and stiffness, electrical properties, and so forth. [1][2][3][4][5][6][7] For the polymer blends, aromatic polyester blends represent a major kind and have been investigated widely. poly(butylene terephthalate) (PBT) and polycarbonate (PC) blends belong to one important polyester pair, which combine the good balance of chemical and impact resistance, excellent flow characteristics and dimensional stability.…”

Section: Introductionmentioning

confidence: 99%

Enhanced Properties of PBT/PC Blends with the Addition of Carboxyl-functionalized Multiwalled Carbon Nanotube

Hu¹,

Song²,

Lv³

et al. 2018

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Carboxyl-functionalized multiwalled carbon nanotube (c-MWCNT) was used to enhance the properties of poly(butylene terephthalate)/polycarbonate (PBT/PC) blends by melt blending. The c-MWCNT inhibited transesterification reactions between PBT and PC. SEM result showed that most of the c-MWCNT dispersed in the PBT matrix and partial c-MWCNT lied between the interface of PBT and PC phases. c-MWCNT promoted the crystallization of PBT due to the decreased transesterification and the heterogeneous nucleating effect, which led to a 20 o C increase of the crystallization temperature. DMA test indicated that the miscibility between PBT and PC decreased with the c-MWCNT loading since the inhibited transesterification. When the c-MWCNT content was 4 wt%, the yield strength of 65.9 MPa and tensile modulus of 2116 MPa were achieved, which corresponded to 23.9 and 19.5% increase relative to the pure PBT/ PC blend. The conductivity and dielectric properties of PBT/PC were largely enhanced by the c-MWCNT. The σ d c values of PBT/PC improved greatly by several orders of magnitude from 10-1 8 to 10-7 when the c-MWCNT content was 2 wt%. The dielectric constant at 100 Hz for the nanocomposites increased from 2.8 to 146 when the c-MWCNT loading varied from 0.1 to 4 wt%, which improved more than 50 times.

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Bimodal poly(ethylene-cb-propylene) comb block copolymers from serial reactors: Synthesis and applications as processability additives and blend compatibilizers

Cited by 25 publications

References 27 publications

Processability‐enhanced bimodal high‐density polyethylene with comb‐branched high‐density polyethylene

Processability‐enhanced bimodal high‐density polyethylene with comb‐branched high‐density polyethylene

A novel combination of sandwich and co‐continuous structure based on polypropylene and styrene‐butadiene‐styrene block copolymer formed with wide range of polypropylene content

Enhanced Properties of PBT/PC Blends with the Addition of Carboxyl-functionalized Multiwalled Carbon Nanotube

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