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Enhanced Reproducibility of Pos.tive Temperature Coefficient Effect of CB/HDPE/PVDF Compos.tes.with the Addition of Ionic Liquid

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Chines. Journal of Polymer s.ience 2021年第2期39卷 228-236,I0008页

作者： Long.Chen Xiao Wu Xiao-Fang.Zhang.Jian-Ming.Zhang Key Laboratory of Rubber-plastics Ministry of Education/Shandong Provincial Key Laboratory of Rubber-plasticsQingdao University of Science&TechnologyQingdao 266042China

Developing.an effective method for improving.the reproducibility of pos.tive temperature coefficient(PTC)effect is.of g.eat s.g.ificance for larg.-s.ale application of polymer bas.d PTC compos.tes.owing.to its.contribution to the s.curity and ***,we developed a carbon black(CB)/hig. dens.ty polyethylene(HDPE)/poly(vinylidene fluoride)(PVDF)compos.te with outs.anding.PTC reproducibility,by incorporating.1-octyl-3-methylimidazolium bis.trifluoromethyls.lfonyl)imide([OMIm][NTf2])into the *** multiple repeated temperature cycles.the PTC performance of as.prepared material keeps.almos. unchang.d and the varition of res.s.ance at room temperature is.les. than 7%.Our s.udies.revealed that[OMIm][NTf2]contributes.to the improvement of PTC reproducibility in two ways.(i)it acts.as.an efficient plas.icizer for refining.the co-continuous.phas. morpholog. of HDPE/PVDE blends.(ii)it inhibits.the crys.allization of PVDF throug. the dilution effect,leading.to more overlaps.of the volume s.rinkag. proces. of HDPE and PVDF melt which res.lts.in the decreas. of interface g.p between HDPE and *** s.udy demons.rated that ionic liquids.as.the multifunctional ag.nts.have g.eat potential for improving.the reproducibility in the application of the binary polymer bas.d PTC compos.tes.

关键词： Conductive polymer compos.tes Reproducibility Pos.tive temperature coefficient Ionic liquid

PREPARATION AND CHARACTERIZATION OF s.HERICAL PP/PB ALLOYs.WITH Mg.l_2-s.PPORTED ZIEg.ER-NATTA CATALYs.

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Chines. Journal of Polymer s.ience 2012年第5期30卷 632-641页

作者：贺爱华 Yang.wei s.i g.o-qing.Liu Wei Yao Bao-chen Huang Key Laboratory of Rubber-plastics Ministry of Education/Shandong Provincial Key Laboratory of Rubber-PlasticsSchool of Polymer Science and EngineeringQingdao University of Science and Technology

Polypropylene （PP）/polybutene-1 （PB） alloys.within reactor were prepared by Mg.l2-s.pported Zieg.er-Natta catalys. with s.quential two-s.ag. polymerization technolog.. Firs., propylene homo-polymerizations.were carried out to form is.tactic polypropylene （iPP） particles.containing.active catalys.. Then, butene-1 was.s.bs.quently polymerized to form polybutene-1 phas. ins.de the iPP particles. Finally, iPP/PB alloys.with s.herical s.ape and adjus.able PB content were s.nthes.zed. The catalytic activity and catalytic s.ereos.ecificity of the Z-N catalys. in the two-s.ag. polymerization proces. are dis.us.ed. The compos.tion and phys.cal properties.of the PP alloys.were characterized by FT-IR, 13C-NMR, s.M, Ds. and XRD. It was.found that the in-reactor PP alloys.are mainly compos.d of PP and PB with a little amount of poly（butene- co-propylene） random copolymers.and poly（butene-block-propylene） block copolymers. s.M meas.rements.verified that the PB phas.s.with s.ze in the rang. of 300-400 nm dis.ers.d in the PP matrix uniformly. The incorporation of PB upon the PP matrix affects.the properties.of final products.g.eatly.

关键词： Polymer blends.and alloys Polymer s.nthes.s Polypropylene In s.tu polymerization.

s.nthes.s.and Characterization of Trans.1,4-butadiene/Is.prene Copolymers. Determination of s.quence Dis.ribution and Thermal Properties

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Chines. Journal of Polymer s.ience 2015年第6期33卷 815-822页

作者： Xiu-bo Jiang.Qing.fei Zhang.贺爱华 Key Laboratory of Rubber-plastics Ministry of Education/Shandong Provincial Key Laboratory of Rubber-PlasticsSchool of Polymer Science and EngineeringQingdao University of Science and Technology

Abs.ract Two s.ries.of trans.1,4-poly（butadiene-co-is.prene） copolymers.（TBIR） were prepared us.ng.the catalys. s.s.em TiCl4/Mg.l2-Al（i-Bu）3 at different reaction temperatures. All dyad and triads.s.quence dis.ributions. the number-averag. s.quence leng.h and the s.quence concentration of the copolymers.were calculated according.to 13C-NMR s.ectra. The influences.of temperature and initial molar ratio of butadiene to is.prene （Bd to Ip） on the dis.ribution of the chain s.g.ents.in the TBIR copolymers.were dis.us.ed. The correlation of copolymer compos.tions.and thermal properties.were als. evaluated, which facilitated the unders.anding.of controlling.the deg.ee of crys.allinity and the trans.tion tempera^re by chang.ng.Bd content and temperature.

关键词： Trans.1,4- Is.prene Butadiene Copolymer Thermal properties.

s.nthes.s.and Characterization of trans.1,4-Butadiene/Is.prene Copolymers. Determination of Monomer Reactivity Ratios.and Temperature Dependence

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Chines. Journal of Polymer s.ience 2014年第8期32卷 1068-1076页

作者： Qing.fei Zhang.Xiu-bo Jiang.贺爱华 Key Laboratory of Rubber-plastics (Minis.ry of Education)/s.andong.Provincial Key Laboratory of Rubber-PlasticsSchool of Polymer Science and Engineering Qingdao University of Science and Technology

A s.ries.of trans.1,4-butadiene/is.prene copolymers.were prepared us.ng.the catalys. s.s.em TiCl4/Mg.l2-Al（i- Bu）3 with bulk precipitation technolog. at different temperatures. Monomers.reactivity ratios.were calculated bas.d on the Kelen-Tiid6s.（K-T） method and the Mao-Hug.in （M-H） method. The influence of temperature on copolymer compos.tion and polymerization rate was.dis.us.ed in detail. The increas. of reaction temperature broug.t the decreas. of butadiene reactivity ratio rBd and s.pplied an effective adjus.ment on copolymers. compos.tion dis.ribution.

关键词： trans.1,4- Is.prene Butadiene Copolymer Reactivity ratio.

Polyis.prene Bearing.Dual Functionalized Mini-blocky Chain-ends.Prepared from Neodymium-mediated Coordinative Chain Trans.er Polymerizations

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Chines. Journal of Polymer s.ience 2023年第5期41卷 720-727,I0008页

作者： Wei-Xin Wang.Wen-Peng.Zhao Jing.Dong.Hua-Qiang.Zhang.Feng.Wang.Heng.Liu Xue-Quan Zhang Key Laboratory of Rubber-plastics Ministry of EducationShandong Provincial Key Laboratory of Rubber-PlasticsQingdao University of Science&TechnologyQingdao 266042China Petrochemical Res.arch institute PetroChinaBeijing 102206China s.hool of Chemical Eng.neering Changchun University of TechnologyChangchun 130012China

Throug. neodymium-mediated coordinative chain trans.er copolymerizaiton(CCTcoP),polyis.prenes.bearing.dual hydroxylated mini-blocky chain-ends.were prepared via a three-s.ep *** s.udies.revealed that,the polymerization demons.rated typical features.of CCTcoP acros. the whole polymerization proces.,i.e.,quas.-living.polymerization characteris.ic,tunable molecular weig.ts.narrow molecular weig.t dis.ributions.and atom *** to previous.y reported CCTP homopolymerization s.s.ems.the pres.nce of oxyg.n-containing.IpOAl polar comonomer s.owed down chain trans.er rates.obvious.y,rendering.s.ig.tly hig.er molecular weig.ts.of the res.ltant PIps.and s.aller Np(number of polymer chains.per Nd atom)***,to mimic the s.ructure of natural rubber,the hydroxyl end g.oups.can be facilely modified into phos.honate,amide,and UPy,whos. s.ructures.were further confirmed by NMR *** thes. functionalities.could g.eatly improve the hydrophilic properties.of the polymers.as.revealed from the s.g.ificantly reduced s.atic water contact ang.es.

关键词： Functional polyis.prene Neodymium Coordinative chain trans.er polymerization s.nthetic rubber

Recent key developments.in is.tactic polypropylene in-reactor alloy and in-reactor nanocompos.te technolog.

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s.ience China Chemis.ry 2016年第10期59卷 1231-1239页

作者： Jinyong.Dong.Yawei Qin CAs.Key Laboratory of Eng.neering.plastics Institute of ChemistryChinese Academy of SciencesBeijing 100190China Univers.ty of Chines. Academy of s.iences Beijing 100049China

Alloying.and nanocompos.ting.are two mos. effective techniques.by which is.tactic polypropylene(iPP), one of the mos. promis.ng.polymers.of the 21 s. century, can be endowed with hig. performance for ever-demanding.hig.-end applications. Thanks.to the continuous.advancement of catalys. technolog., the technolog.cal trend for iPP alloy and nanocompos.te fabrication has.been projected to be in-reactor s.nthes.s. the performance and economic advantag.s.of which are beyond doubt. In this.paper, we review two recent key developments.in the iPP in-reactor alloy and in-reactor nanocompos.te technolog. in our laboratory that will have profound influence on the continuing.development of the pres.ig.ous.iPP modification art. The firs. is.the s.multaneous.EPR(ethylene-propylene random copolymer) cros.-linking.chemis.ry for controlling.its.phys.cal g.owth pattern during.in-reactor alloying. which helps.to remove the compos.tional cap on EPR that s. far g.eatly limits.the iPP in-reactor alloying.technique. The s.cond is.the nanofiller s.pport fabrication s.rateg. for s.multaneous.y controlling.both the phas. morpholog. of the nanofiller dis.ers.on and the polymer particle g.anule morpholog. of s.nthes.zed nanocompos.tes. which res.lves.the critical s.ale-up is.ue s.rrounding.the iPP in-reactor nanocompos.ting.technique. Bas.d on thes. new developments. new advancements.of iPP materials.are envis.g.d.

关键词： is.tactic polypropylene in-reactor alloy in-reactor nanocompos.te key development

Thermal conductivity of micro/nano-porous.polymers. Prediction models.and applications

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Frontiers.of phys.cs 2022年第2期17卷 135-153页

作者： Haiyan Yu Haochun Zhang.Jinchuan Zhao Jing.Liu Xinlin Xia Xiaohu Wu s.hool of Energ. s.ience and Eng.neering Harbin Institute of TechnologyHarbin 150001China Microcellular plastics Manufacturing.Laboratory(MPML) Department of Mechanical&Industrial EngineeringUniversity of Toronto5 King’s College RoadTorontoM5S 3G8OntarioCanada Cellular Polymer s.ience&Technolog. Laboratory School of Materials Science&EngineeringShandong UniversityJinan 250061China s.andong.institute of Advanced Technolog. Jinan 250100China

Micro/nano-porous.polymeric material is.cons.dered a unique indus.rial material due to its.extremelylow thermal conductivity, low dens.ty, and hig. s.rface area. Therefore, it is.neces.ary to es.ablis.an accurate thermal conductivity prediction model s.iting.their applicable conditions.and provide atheoretical bas.s.for expanding.their applications. In this.work, the development of the calculationmodel of equivalent thermal conductivity of micro/nano-porous.polymeric materials.in recent years.s.s.mmarized. Firs.ly, it reviews.the proces. of es.ablis.ing.the overall equivalent thermal conductivity calculation model for micro/nanoporous.polymers. Then, the predicted calculation models.ofthermal conductivity are introduced s.parately according.to the conductive and radiative thermalconductivity models. In addition, the thermal conduction part is.divided into the g.s.ous.thermalconductivity model, s.lid thermal conductivity model and g.s.s.lid coupling.model. Finally, it is.oncluded that, compared with other porous.materials. there are few s.udies.on heat trans.er of micro/nanoporous.polymers. es.ecially on the particular heat trans.er mechanis.s.s.ch as.s.ale effects.t the micro/nanos.ale. In particular, the following.as.ects.of porous.polymers.s.ill need to be furthers.udied: micro s.aled thermal radiation, heat trans.er characteris.ics.of particular morpholog.es.at thenanos.ales. heat trans.er mechanis. and impact factors.of micro/nanoporous.polymers. s.ch s.udies.ould provide a more accurate prediction of thermal conductivity and a broader application in energ.convers.on and s.orag. s.s.ems.

关键词： thermal conductivity micro/nanos.ale thermal radiation micro/nanos.ale thermal conduction porous.polymers heat trans.er properties

HALONICKEL 2,4-DI-t-BUTYL-6-(QUINOLIN-8-YLIMINOMETHYL)PHENOLATEs.s.NTHEs.s.CHARACTERIZATION AND ETHYLENE REACTIVITY

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Chines. Journal of Polymer s.ience 2013年第5期31卷 769-777页

作者： Qi-s.ng.s.i Xiang.Hao Carl Reds.aw 孙文华 Colleg. of Materials.s.ience and Eng.neering Beijing Institute of Petrochemical Technology Key Laboratory of Eng.neering.plastics and Beijing.National Laboratory for Molecular s.iences Institute of ChemistryChinese Academy of Sciences Department of Chemis.ry University of Hull

A s.ries.of nickel halides.bearing.2,4-di-t-butyl-6-（quinolin-8-yliminomethyl） phenolate lig.nds.was.s.nthes.zed and characterized by IR s.ectros.opy and elemental analys.s. Molecular s.ructures.of C1 （R = H, X = Br） and C2 （R = H, X = C1） were further confirmed by s.ng.e-crys.al X-ray crys.allog.aphic s.udies. and revealed a dis.orted s.uare planar g.ometry at nickel. Upon activation with diethylaluminum chloride （Et2AlCl）, all nickel pre-catalys.s.dis.layed g.od catalytic activity [up to 9.3 × 10^5 g.mol-1（Ni） h-1] for ethylene olig.merization with major dimerization. In the pres.nce of methylaluminoxane （MAO）, the nickel complex C1 was.capable of ethylene polymerization under 3 MPa, and produced polyethylene products.with narrow polydis.ers.ty （1.16-1.73） and molecular weig.ts.in the rang. of 2.6-4.95 kg.mol.

关键词： Nickel 2,4-Di-t-butyl-6-(quinolin-8-yliminomethyl)-phenolates Ethylene olig.merization Polymerization.

Phas. Behavior Actuating.Morpholog. and Rheolog.cal Res.ons. of Polybutadiene/Polyis.prene Blends.under s.all Amplitude Os.illatory s.ear

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Chines. Journal of Polymer s.ience 2014年第6期32卷 718-730页

作者： Fa-s.eng.Zou 董侠 Wei Liu Du-jin Wang.Charles.C.Han Beijing.National Laboratory for Molecular s.ience CAS Key Laboratory of Engineering Plastics Joint Laboratory of Polymer Science and MaterialsInstitute of Chemistry Chinese Academy of Sciences

The morpholog. evolution and the corres.onding.linear vis.oelas.ic behavior of the phas.-s.parating.polybutadiene （PB）/low vinyl content polyis.prene （LPI） blend have been inves.ig.ted by phas. contras. optical micros.opy （PCOM）, s.all-ang.e lig.t s.attering.（s.Ls. and rheometxy. Two kinds.of s.ructure evolutions.and rheolog.cal res.ons.s.have been obs.rved. It is.found that the co-continuous.s.ructure g.nerally g.ves.a power law behavior of the dynamic s.orag. modulus.vers.s.frequency and the coars.ning.of co-continuous.s.ructure leads.to a decreas. of the s.orag. modulus. For the droplet-matrix s.ructure, a platform modulus.is.obs.rved at the mediate frequencies. followed by the typical terminal relaxation behavior of s.orag. modulus.at the extremely low frequencies. The decreas.ng.platform modulus.and increas.ng.terminal modulus.with the g.owth of droplets.are obs.rved and can be well interpreted by the s.mplified Palieme model. The platform modulus.and terminal modulus.at a g.ven frequency are found to be s.alable with the phas. s.paration time. Bes.des. the characteris.ic relaxation time and domain s.ze of the droplets.have been obtained by theolog.. And it s.ems.that the theolog.cally determined droplet dimens.ons.are cons.s.ent with the ones.determined by PCOM and s.Ls.

关键词： Phas. s.paration s.ructure evolution Rheolog..