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Reactive processing of poly(lactic acid)/poly(ethylene octene) blend film with tailored interfacial intermolecular entanglement and toughening mechanism

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Journal of Materials Science & Technology 2022年第3期98卷 186-196页

作者： Wenjun He Lin Ye phil coates Fin Caton-Rose Xiaowen Zhao State Key Laboratory of Polymer Materials Engineering of China Polymer Research Institute of Sichuan UniversityChengdu 610065China School of Engineering Design and TechnologyUniversity of BradfordBradfordUK

In order to obtain a uniform and effectively toughened poly(lactic acid)film by blending with low content of poly(ethylene octene)(POE)with high elasticity,the tailored interfacial intermolecular interaction and entanglement between the two phases of the PLA/POE blend was innovatively constructed via the facile reactive melt blending process through the reaction of the epoxy/anhydride groups grafted on the POE chains with the end groups of PLA chains(PLA/GPOE-MPOE).It was observed that POE domains were embedded tightly in PLA matrix with a fuzzy interface and abundant interface transition area,and the impact fractured surface of the blend showed an obvious plastic deformation with less occurrence of fibrillation of PLA matrix or interfacial *** with neat PLA and directly blended PLA/POE blends,the PLA/GPOE-MPOE blend exhibited much higher complex viscosity/storage modulus,much lower tanδvalues in the terminal region,and obvious strain-hardening *** deviation in viscoelastic behavior of PLA/GPOE-MPOE from linear PLA indicated the enhanced molecular entanglement between the long-branched chains,resulting in an enhancement of the stretching ability during biaxial drawing of the *** PLA/GPOE-MPOE films with draw ratio as high as 7×7 were obtained through biaxial stretching,which showed much higher tensile strength and the elongation at break than that of neat PLA and PLA/POE *** work provides a facile method for fabricating toughening PLA films with application potentials.

关键词： Poly(lactic acid)/poly(ethylene octene)(PLA/POE)blend film Reactive processing Tailored interfacial intermolecular interaction Long-chain branched structure Toughening mechanism

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Advantage of Preserving Bi-orientation Structure of Isotactic Polypropylene through Die Drawing

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Chinese Journal of Polymer Science 2021年第1期39卷 91-101,I0007页

作者： Dong Lyu Ying-Ying Sun Yu-Qing Lai Glen Thompson philip Caton-Rose phil coates Ying Lu Yong-Feng Men State Key Laboratory of Polymer Physics and Chemistry Changchun Institute of Applied ChemistryChinese Academy of SciencesChangchun 130022China University of Science and Technology of China School of Applied Chemistry and EngineeringHefei 230026China Exxon Mobil Asia Paciﬁc Research&Development Co. Ltd.Shanghai 200241China Polymer Interdisciplinary Research Centre University of BradfordBradford BD71DPUK

The isotactic polypropylene(iPP) usually shows a unique parent-daughter lamellae structure in which the parent and daughter lamellae are against each other with a near perpendicular angle(80° or 100°). Inducing a high fraction of oriented cross-hatched structure in iPP during processing is desirable for designing the bi-oriented iPP products. We processed a commercial iPP via tensile-stretching and die-drawing to evaluate the structural evolution of oriented parent-daughter lamellae. It turned out that the die-drawing process had an advantage in attaining a high fraction of oriented cross-hatched structure of iPP, as compared to the free tensile stretching. Besides, the presence of α-nucleating agents affected the formation of oriented parent-daughter lamellae in the die-drawn samples whereas such influence diminished in the free stretched ones. It was found that the confined deformation inside the die led to the well-preserved oriented cross-hatched structure in the die-drawn iPP.

关键词： Die-drawing Isotactic polypropylene Solid-state deformation Bi-orientation WAXD

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Geometrical Dependence of Shear Viscosity of Polymer Melts Flowing in Micro Channel

Geometrical Dependence of Shear Viscosity of Polymer Melts F...

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第十二届全国流变学学术会议

作者： Xiang Lin Zhimin Dang Dongyun Ren Adrian Kelly Mike Woodhead phil coates Department of Polymer Science & Engineering School of Chemistry and Biological EngineeringUniversity of Science & Technology Beijing College of Mechanical and Electrical Engineering Beijing University of Chemical Technology IRC in Polymer Engineering School of EngineeringDesign & TechnologyUniversity of Bradford

Geometrical dependence of viscosity of polymer melts(for example,PMMA and HDPE)are studied with different capillary dies of 0.25,0.5 and 1.0mm,and by means of a twin-bore capillary rheometer based on

关键词： Viscosity and viscoelasticity Rheology Properties and characterization

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聚丙烯大形变下应力发白机理

聚丙烯大形变下应力发白机理

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中国化学会2017全国高分子学术论文报告会

作者：卢影 phil coates 门永锋中国科学院长春应用化学研究所 School of Engineering Design and TechnologyUniversity of Bradford

等规聚丙烯在一定温度区间（低于熔点）下拉伸先发生塑形形变至高度取向,此时样品呈透明状。随后进一步的拉伸则发生应力发白现象。这种大形变的应力发白具有与拉伸温度无关的临界应力行为,发白临界应力随分子量增加而增加,说明其机理... 详细信息

等规聚丙烯在一定温度区间（低于熔点）下拉伸先发生塑形形变至高度取向,此时样品呈透明状。随后进一步的拉伸则发生应力发白现象。这种大形变的应力发白具有与拉伸温度无关的临界应力行为,发白临界应力随分子量增加而增加,说明其机理是高度取向的非晶网络（主要是拉直的微纤间系带分子网络）断裂松弛所致。进一步的研究发现预先模拉（die drawn）取向的样品在随后沿不同方向二次拉伸过程中发生应力发白的临界应力具有方向依赖性,微观结构解析表明不同方向拉伸的样品内发白前呈现不同的微纤长轴方向与拉伸方向之间的夹角,这使得微纤间系带分子网络受力分散,导致不同的表观应力发白临界应力。

关键词：聚烯烃聚丙烯应力发白 SAXS 临界应力

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生物医用聚氨酯弹性体的动态压缩性能研究

生物医用聚氨酯弹性体的动态压缩性能研究

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2013年全国高分子学术论文报告会

作者：姜秀娟 Pete Twigg 张立群 phil coates 北京化工大学有机无机复合材料国家重点实验室 School of Engineering Design and TechnologyUniversity of Bradford

＜正＞生物医用聚氨酯的动态力学性能对于在动态条件下使用或工作的器件,如心脏起搏器绝缘线、人工血管、人工关节等,是极为重要的一个性能指标。本文用预聚物法合成了两种不同结构的医用聚氨酯弹性体M50与H95,利用生物力学试验机进行... 详细信息

＜正＞生物医用聚氨酯的动态力学性能对于在动态条件下使用或工作的器件,如心脏起搏器绝缘线、人工血管、人工关节等,是极为重要的一个性能指标。本文用预聚物法合成了两种不同结构的医用聚氨酯弹性体M50与H95,利用生物力学试验机进行了不同频率的DMA测试

关键词：聚氨酯弹性体动态压缩温度生物医用

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Detecting Inhomogeneity in Daily Climate Series Using Wavelet Analysis

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Advances in Atmospheric Sciences 2008年第2期25卷 157-163页

作者：严中伟 phil D.JONES Laboratory of Regional Climate and Environment for Temperate East Asia Institute of Atmospheric Physics Chinese Academy of Sciences Beijing 100029 Climatic Research Unit University of East Anglia Norwich NR4 7TJ United Kingdom

A wavelet method was applied to detect inhomogeneities in daily meteorological series, data which are being increasingly applied in studies of climate extremes. The wavelet method has been applied to a few well- established long-term daily temperature series back to the 18th century, which have been ＂homogenized＂ with conventional approaches. Various types of problems remaining in the series were revealed with the wavelet method. Their influences on analyses of change in climate extremes are discussed. The results have importance for understanding issues in conventional climate data processing and for development of improved methods of homogenization in order to improve analysis of climate extremes based on daily data.

关键词： inhomogeneity daily meteorological observation wavelet analysis climate extremes

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Experimental study on influence of blade angle and particle size on particle mechanics on a batch-operated single floor of a multiple hearth furnace

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Particuology 2024年第2期85卷 224-240页

作者： Max Kriegeskorte Nikoline Hilse phil Spatz Viktor Scherer Institute for Energy Plant Technology(LEAT) Ruhr University BochumUniversitätsstraβe 15044780 BochumGermany

In industry,multiple hearth furnaces are used for the thermal treatment of particulate *** current contribution concentrates on the experimental analysis of particle mechanics for a batch-operated single floor of a multiple hearth *** particles are agitated on the circular floor by a single,rotating rabble arm equipped with three flat rabble blades of 10 mm *** blade angle,defined as the angle,which the blade is inclined against the tangential direction,is varied from 0°to 90°.A single layer of spherical polyoxymethylene(POM)particles with three different diameters(5,10 and 20 mm)is placed on the *** analyze the results,two parameters have been extracted from image analysis when the bed of particles is agitated,first,the area not covered by particles and second,the frequency distribution of the mean distance among the *** particle free surface area increases with the inclination of the *** evolution of the particle free surface area differs for the different particle *** general,the maximum particle free area for all blade angles is the largest for the 5 mm particles followed by the 20 mm *** the 10 mm particles,the particle free surface area starts for a blade angle of 0°at larger values than for the 20 mm particles but the values fall below the values for the 20 mm particles for larger blade *** reason for this behavior is discussed in *** mean distance among the particles is a parameter characterizing the length scales dominating the effects on the *** frequency distribution of the mean distance among particles provides infor-mation about the morphology of the particle bulk,for example,whether the free surface area is inter-spersed with particles.

关键词： Hearth furnace floor Particle movement Spherical particles Particle free surface area Mean distance among particles

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The Black-winged Monarch(Monarcha frater):Geographic variation,taxonomy,a"new"population,and an enduring mystery in migration

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Avian Research 2023年第3期14卷 467-477页

作者： Leo Joseph Julian Teh Paul Sweet phil Gregory Australian National Wildlife Collection CSIRO National Research Collections AustraliaCanberra2601Australia American Museum of Natural History New YorkUSA Sicklebill Safaris TopazQueensland4885Australia

The Black-winged Monarch(Monarcha frater)inhabits low-mid elevation forests across New Guinea and far northeastern *** its four recognized subspecies,*** is migratory,breeding in tropical north-eastern Australia from approximately November–*** non-breeding range of ***,apart from some individuals overwintering in Australia,has been unknown for>100 *** from 194 New Guinean and Australian specimens and a literature review have not solved this mystery;the narrow latitudinal range of the intratropical migration may inhibit use of GPS loggers in resolving the migration *** work in central and western parts of southern New Guinea is *** data,however,revealed an essentially overlooked population in north-western New Guinea east of the Bird's Head Peninsula phenotypically indistinguishable from nominate *** of that *** genomic analysis of the complex will be largely done from toepad skin because frozen tissue samples for DNA analysis exist only of four individuals of what we suggest should be elevated to species rank as *** discuss how genomic analysis might distinguish among alternative taxonomic hypotheses of one,two or three *** suggest English names for what we consider to be three diagnosable taxa worth recognizing at species rank in this group:Arfak Monarch corresponding to ***(Bird's Head Peninsula and the“new”population of north-western New Guinea);Pearly Monarch for ***(Australia and still unknown non-breeding range),and Masked Monarch for ***(including kunupi,elsewhere in New Guinea).

关键词： Australia Migration monarch flycatcher Monarcha frater New Guinea Taxonomy

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The Motif Tracking Algorithm

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International Journal of Automation and computing 2008年第1期5卷 32-44页

作者： William Wilson phil Birkin Uwe Aickelin School of Computer Science University of NottinghamNottingham NG8 1BBUK

The search for patterns or motifs in data represents a problem area of key interest to finance and economic researchers. In this paper, we introduce the motif tracking algorithm （MTA）, a novel immune inspired （IS） pattern identification tool that is able to identify unknown motifs of a non specified length which repeat within time series data. The power of the algorithm comes from the fact that it uses a small number of parameters with minimal assumptions regarding the data being examined or the underlying motifs. Our interest lies in applying the algorithm to financial time series data to identify unknown patterns that exist. The algorithm is tested using three separate data sets. Particular suitability to financial data is shown by applying it to oil price data. In all cases, the algorithm identifies the presence of a motif population in a fast and efficient manner due to the utilization of an intuitive symbolic representation. The resulting population of motifs is shown to have considerable potential value for other applications such as forecasting and algorithm seeding.

关键词： Motif detection repeating patterns time series analysis artificial immune systems immune memory

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Ionospheric longitudinal variations at midlatitudes: Incoherent scatter radar observation at Millstone Hill

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Science China(Technological Sciences) 2012年第5期55卷 1153-1160页

作者： COSTER Anthea HOLT John FOSTER John ERICKSON phil MIT Haystack Observatory Off Route 40 Westford MA 01866 USA

Incoherent scatter radar （ISR） extra-wide coverage experiments during the period of 1978-2011 at Millstone Hill are used to investigate longitudinal differences in electron density. This work is motivated by a recent finding of the US east-west coast difference in TEC suggesting a combined effect of changing geomagnetic declination and zonal winds. The current study pro- vides strong supporting evidence of the longitudinal change and the plausible mechanism by examining the climatology of electron density Ne on both east and west sides of the radar with a longitude separation of up to 40% for different heights within 300-450 kin. Main findings include： 1） The east-west difference can be up to 60% and varies over the course of the day, being positive （East side Ne 〉 West side Ne） in the late evening, and negative （West side Ne 〉 East side Ne） in the pre-noon. 2） The east-west difference exists throughout the year. The positive （relative） difference is most pronounced in winter; the negative （relative） difference is most pronounced in early spring and later summer. 3） The east-west difference tends to enhance toward decreasing solar activity, however, with some seasonal dependence; the enhancements in the positive and negative differences do not take place simultaneously. 4） Both times of largest positive and largest negative east-west differences in Ne are earlier in summer and later in winter. The two times differ by 12-13 h, which remains constant throughout the year. 5） Variations at different heights from 300-450 km are similar. Zonal wind climatology above Millstone Hill is found to be perfectly consistent with what is expected based on the electron density difference between the east and west sides of the site. The magnetic declination-zonal wind mechanism is true for other longitude sectors as well, and may be used to understand longitudinal variations elsewhere. It may also be used to derive thermospheric zonal winds.

关键词： midlatitude ionosphere geomagnetic declination thermospheric zonal winds longitudinal variation incoherent scatterradar

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