LrgpV1, Hal, Checkpoint, bibRecord, 000886

Periodic Switching of Monomer Additions for Controlling the Compositions and Microstructures of Segmented and Random Ethylene-Propylene Copolymers in Polypropylene in-Reactor Alloys

Identifieur interne : 000886 ( Hal/Checkpoint ); précédent : 000885; suivant : 000887

Periodic Switching of Monomer Additions for Controlling the Compositions and Microstructures of Segmented and Random Ethylene-Propylene Copolymers in Polypropylene in-Reactor Alloys

Auteurs : Zhou Tian [République populaire de Chine] ; Xue-Ping Gu [République populaire de Chine] ; Gang-Liang Wu [République populaire de Chine] ; Lian-Fang Feng [République populaire de Chine] ; Zhi-Qiang Fan [République populaire de Chine] ; Guo-Hua Hu [France]

Source :

Industrial and engineering chemistry research [ 0888-5885 ] ; 2011-05-18.

RBID : Hal:hal-00778435

English descriptors

mix :
- BEHAVIOR, BLENDS, GAS-PHASE, IMPACT, MORPHOLOGY, MULTISTAGE SEQUENTIAL POLYMERIZATION, POLYMERS, STRUCTURAL-CHARACTERIZATION, THERMAL FRACTIONATION, ZIEGLER-NATTA CATALYST.

Abstract

This work aims at shading fundamental insights into mechanisms that dictate the composition and microstructure of polypropylene/poly(ethylene-co-propylene) (PP/EPR) in-reactor alloys produced by the multizone circulating reactor (MZCR) technology, a novel one for polyolefin production. For this purpose, this technology is simulated by a batch process with periodic switching of monomer additions. An increase in the switch frequency leads to a decrease in the fraction of ethylene/propylene random (amorphous) copolymers denoted as EPR and an increase in the fraction and the length of PP segments of ethylene/propylene segmented (partially crystalline) copolymers denoted as EPS. Concomitantly, the size of the dispersed phase domains (EPR) decreases, and its size distribution becomes more uniform as a result of the decrease in the fraction of the EPR and the increase in that of the EPS which acts as a compatibilizer for PP/EPR in-reactor blends. Mechanical properties of the PP/EPR in-reactor blends are also discussed.

Url:

https://hal.archives-ouvertes.fr/hal-00778435

DOI: 10.1021/ie102436u

Links toward previous steps (curation, corpus...)

to stream Hal, to step Corpus: 000877
to stream Hal, to step Curation: 000877

Links to Exploration step

Hal:hal-00778435

Le document en format XML

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<front><div type="abstract" xml:lang="en">This work aims at shading fundamental insights into mechanisms that dictate the composition and microstructure of polypropylene/poly(ethylene-co-propylene) (PP/EPR) in-reactor alloys produced by the multizone circulating reactor (MZCR) technology, a novel one for polyolefin production. For this purpose, this technology is simulated by a batch process with periodic switching of monomer additions. An increase in the switch frequency leads to a decrease in the fraction of ethylene/propylene random (amorphous) copolymers denoted as EPR and an increase in the fraction and the length of PP segments of ethylene/propylene segmented (partially crystalline) copolymers denoted as EPS. Concomitantly, the size of the dispersed phase domains (EPR) decreases, and its size distribution becomes more uniform as a result of the decrease in the fraction of the EPR and the increase in that of the EPS which acts as a compatibilizer for PP/EPR in-reactor blends. Mechanical properties of the PP/EPR in-reactor blends are also discussed.</div>
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<author role="aut"><persName><forename type="first">Xue-Ping</forename>
<surname>Gu</surname>
</persName>
<email>guxueping@zju.edu.cn</email>
<idno type="halAuthorId">806775</idno>
<affiliation ref="#struct-211942"></affiliation>
</author>
<author role="aut"><persName><forename type="first">Gang-Liang</forename>
<surname>Wu</surname>
</persName>
<idno type="halAuthorId">807610</idno>
<affiliation ref="#struct-211942"></affiliation>
</author>
<author role="crp"><persName><forename type="first">Lian-Fang</forename>
<surname>Feng</surname>
</persName>
<email>fenglf@zju.edu.cn</email>
<idno type="halAuthorId">807551</idno>
<affiliation ref="#struct-212104"></affiliation>
</author>
<author role="aut"><persName><forename type="first">Zhi-Qiang</forename>
<surname>Fan</surname>
</persName>
<idno type="halAuthorId">807611</idno>
<affiliation ref="#struct-212104"></affiliation>
</author>
<author role="aut"><persName><forename type="first">Guo-Hua</forename>
<surname>Hu</surname>
</persName>
<email>guo-hua.hu@univ-lorraine.fr</email>
<idno type="halAuthorId">805871</idno>
<affiliation ref="#struct-56663"></affiliation>
<affiliation ref="#struct-211875"></affiliation>
</author>
</analytic>
<monogr><idno type="halJournalId" status="VALID">5453</idno>
<idno type="issn">0888-5885</idno>
<idno type="eissn">1520-5045</idno>
<title level="j">Industrial and engineering chemistry research</title>
<imprint><publisher>American Chemical Society</publisher>
<biblScope unit="volume">50</biblScope>
<biblScope unit="issue">10</biblScope>
<biblScope unit="pp">5992-5999</biblScope>
<date type="datePub">2011-05-18</date>
</imprint>
</monogr>
<idno type="doi">10.1021/ie102436u</idno>
</biblStruct>
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<profileDesc><langUsage><language ident="en">English</language>
</langUsage>
<textClass><keywords scheme="author"><term xml:lang="en">ZIEGLER-NATTA CATALYST</term>
<term xml:lang="en">MULTISTAGE SEQUENTIAL POLYMERIZATION</term>
<term xml:lang="en">STRUCTURAL-CHARACTERIZATION</term>
<term xml:lang="en">THERMAL FRACTIONATION</term>
<term xml:lang="en">GAS-PHASE</term>
<term xml:lang="en">MORPHOLOGY</term>
<term xml:lang="en">BLENDS</term>
<term xml:lang="en">IMPACT</term>
<term xml:lang="en">POLYMERS</term>
<term xml:lang="en">BEHAVIOR</term>
</keywords>
<classCode scheme="halDomain" n="spi.gproc">Engineering Sciences [physics]/Chemical and Process Engineering</classCode>
<classCode scheme="halDomain" n="chim.poly">Chemical Sciences/Polymers</classCode>
<classCode scheme="halTypology" n="ART">Journal articles</classCode>
</textClass>
<abstract xml:lang="en">This work aims at shading fundamental insights into mechanisms that dictate the composition and microstructure of polypropylene/poly(ethylene-co-propylene) (PP/EPR) in-reactor alloys produced by the multizone circulating reactor (MZCR) technology, a novel one for polyolefin production. For this purpose, this technology is simulated by a batch process with periodic switching of monomer additions. An increase in the switch frequency leads to a decrease in the fraction of ethylene/propylene random (amorphous) copolymers denoted as EPR and an increase in the fraction and the length of PP segments of ethylene/propylene segmented (partially crystalline) copolymers denoted as EPS. Concomitantly, the size of the dispersed phase domains (EPR) decreases, and its size distribution becomes more uniform as a result of the decrease in the fraction of the EPR and the increase in that of the EPS which acts as a compatibilizer for PP/EPR in-reactor blends. Mechanical properties of the PP/EPR in-reactor blends are also discussed.</abstract>
</profileDesc>
</hal>
</record>

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Periodic Switching of Monomer Additions for Controlling the Compositions and Microstructures of Segmented and Random Ethylene-Propylene Copolymers in Polypropylene in-Reactor Alloys

Periodic Switching of Monomer Additions for Controlling the Compositions and Microstructures of Segmented and Random Ethylene-Propylene Copolymers in Polypropylene in-Reactor Alloys

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