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Effects of Interface on the Dynamic Hysteresis Loss and Static Mechanical Properties of Illite Filled SBR Composites

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Chinese Journal of Polymer Science 2022年第11期40卷 1493-1502页

作者： Zhe-Peng Wang Hao Zhang Qiang Liu Shao-Juan Wang shou-ke yan key Laboratory of Rubber-Plastics Ministry of EducationQingdao University of Science&TechnologyQingdao266042China State key Laboratory of Chemical Resource Engineering Beijing University of Chemical TechnologyBeijing100029China

Despite growing interest in nano-sized fillers,micro-sized fillers with desired compatibility are still used for reinforcing rubbers,owing to their lower production cost and easier processing relative to nano-sized ***,the abundant and eco-friendly clay minerals are recognized as the materials of the twenty-first ***,illite,a naturally occurring clay having dimension in micrometric scale,has been selected as filler to reinforce the *** improve the compatibility of illite with SBR,the illite was modified by either bis[3-(triethoxysilyl)propyl]tetrasulfide(Si69-illite)or 3-mercaptopropyltriethoxysilane(KH580-illite).The interfacial interactions of SBR composites filled with pristine illite(illite/SBR)and Si69-illite(Si69-illite/SBR),or KH580-illite(KH580-illite/SBR)were characterized by bound rubber content and Payne effect measurements,while dynamic hysteresis losses of these uncured and cured composites were also analyzed under various strain *** was found that the filler-rubber interactions were greatly improved for Si69-illite/SBR and KH580-illite/SBR systems compared to the illite/SBR *** leads to an increment of modulus at 300%strain of the composites from 3.46 MPa for illite/SBR to 7.70 MPa for Si69-illite/SBR and12.96 MPa for KH580-illite/***,lower rolling resistance and better wear resistance without compromising wet traction of Si69-illite/SBR and KH580-illite/SBR have been *** demonstrates the high possibility of Si69 and KH580 modified illites as promising alternative fillers for reinforcing rubbers.

关键词： Illite SBR Composite Dynamic hysteresis loss Static mechanical properties

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Direct Comparison of Crystal Nucleation Activity of PCL on Patterned Substrates

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Chinese Journal of Polymer Science 2019年第7期37卷 693-699页

作者： Jian Hu Rui Xin Chun-Yue Hou shou-ke yan Ji-Chun Liu key Laboratory of Rubber-Plastics Ministry of Education/Shandong Provincial Key Laboratory of Rubber-plastics Qingdao University of Science & Technology College of Chemical Engineering and Pharmaceutics Key Laboratory of Polymer Science and Nanotechonology Henan University of Science and Technology

A sample containing different regions with poly(ε-caprolactone)(PCL), oriented polyethylene (PE), and oriented isotactic polypropylene (iPP) films in contact with glass slide has been prepared to be observed in the same view field in an optical microscope and the crystallization of PCL in different regions during cooling from 80 °C down to room temperature at a rate of 1 °C·min^-1 was studied. The results showed that the crystallization of PCL started first at the PE surface and then at the iPP surface, while its bulk crystallization occured much later. This indicates that though both PE and iPP are active in nucleating PCL, the nucleation ability of PE is stronger than that of iPP. This was due to a better lattice matching between PCL and PE than that between PCL and iPP. Moreover, since lattice matching existed between every (hk0) lattice planes of both PCL and PE but only between the (100)PCL and (010)iPP lattice planes, the uniaxial orientation feature of the used PE and iPP films resulted in the existence of much more active nucleation sites of PCL on PE than on iPP. This led to the fact that the nucleation density of PCL at PE surface was so high that the crystallization of PCL at PE surface took place in a way like the film developing process with PCL microcrystallites happened everywhere with crystallization proceeding simultaneously. On the other hand, even though iPP also enhanced the nucleation density of PCL evidently, the crystallization of PCL at iPP surface included still a nucleation and crystal growth processes similar to that of its bulk crystallization.

关键词： Poly(ε-caprolactone) Polypropylene Polyethylene Epitaxy Heterogeneous nucleation

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AN ATOMIC FORCE MICROSCOPY STUDY ON THE AGGREGATION OF ISOTACTIC POLY(METHYL METHACRYLATE)

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Chinese Journal of Polymer Science 2007年第2期25卷 207-215页

作者： Jing Liu Ji-jun Wang Ting Li Yong Zhou De-yan Shen Yun Huang shou-ke yan State key Laboratory of Polymer Physics and Chemistry Institute of Chemistry The Chinese Academy of Sciences Beijing 100080 China physics Department Peking University Beijing 100080 China

Aggregation process of isotactic poly（methyl methacrylate）（i-PMMA） has been studied extensively for many years, and considerable progress has been made in both experimental and theoretical studies. They are, however, seldom sustained by real-space observations of the underlying morphology. In this paper, the aggregation process of i-PMMA in concentrated acetone solutions and the fractal structure of the resulting three-dimensional clusters were characterized on the basis of real-space AFM observations of their two-dimensional projection. It was found that spherical multiple-chain particles formed upon collapse and aggregation of the involving chains as a whole during quenching the solution to room temperature. By keeping the solution at room temperature, the initially formed particles stick together upon contact to form larger particles through reassembling very slowly. The succeeding collision of the enlarged spherical particles leads to the formation of small clusters. These newly formed small clusters grow when they meet with other clusters or single Brownian particles. This leads to the formation of large clusters with fractal dimension of 1.95 ± 0.05, which suggest a reaction-limited cluster aggregation of i-PMMA in a concentrated acetone solution. This is in accordance with the conclusion obtained by light scattering measurements.

关键词： Isotactic poly(methyl methacrylate) Aggregation Fractal dimension Atomic force microscopy.

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Effect of Phase Separation Size on the Properties of Self-healing Elastomer

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Chinese Journal of Polymer Science 2024年第6期42卷 798-804页

作者： Jun Xu Lei Zhu Xian-Qi Feng Cong Sui Wen-Peng Zhao shou-ke yan School of Chemical Engineering Qingdao University of Science&TechnologyQingdao266042China College of Engineering Yanching institute of TechnologyLangfang065210China key Laboratory of Rubber-plastics Qingdao University of Science&TechnologyQingdao266042China State key Laboratory of Chemical Resource Engineering Beijing University of Chemical TechnologyBeijing100029China

Regulation of phase structure has been recognized as one of the most effective ways to fabricate self-healing polymers with high mechanical *** mechanical properties of the resultant polymers are certainly affected by the size of separated phase ***,the study on this aspect is absence,because it can hardly exclude the influence of variation in monomer proportion required for tuning the separated phase ***,we report the first study on tuning the phase size through reversible addition-fragmentation chain transfer(RAFT)polymerization without changing the proportion of *** expected,the size of separated phase has been successfully mediated from 15 nm to 9 nm by tuning the molecular weight of the chain transfer *** is found that the mechanical strength and the self-healing efficiency of the resultant polymers increase simultaneously with the decrease of phase *** study on the formation kinetics of hydrogen bonds reveals that the decrease of phase size can facilitate the re-bonding rate of hydrogen bonds,even if the migration of polymer chains is restricted.

关键词： Self-healing polymers Phase separation Reversible addition-fragmentation chain transfer

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Crystallizability of Poly(ε-caprolactone) Blends with Poly(vinylphenol) under Different Conditions

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Chinese Journal of Polymer Science 2014年第9期32卷 1119-1127页

作者： Tian-bo yang Xiao-li Sun Zhong-jie Ren 李慧慧 shou-ke yan State key Laboratory of Chemical Resource Engineering Beijing University of Chemical Technology

The intermolecular interaction between poly（vinylphenol）（PVPh） and polycaprolactone （PCL） and the crystallization behavior of PCL in PCL/PVPh blends with different compositions and under different conditions were investigated by Fourier transform infrared spectra （FTIR） and differential scanning calorimetry （DSC）. It has been shown that the PCL in the blends with different blend ratios all exists in crystalline state after solution casting, even though the crystallinity decreases with increasing PVPh content. For the melt crystallized samples, PCL in its 80/20 PCL/PVPh sample can still crystallize. The crystallinity is, however, lower than that of the solution cast sample. For blends containing 50% or 20% PCL, the as-cast samples are semicrystalline and can change to compatible amorphous state after heat treatment process. FTIR analysis shows the existence of hydrogen bonding between PCL and PVPh and the fraction of hydrogen bonds increases remarkably after heat treatment process.

关键词： Poly(vinylphenol) Polycaprolactone Polymer blends Crystallinity Hydrogen bonding.

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Enhanced αγ′ Transition of Poly(vinylidene fluoride) by Step Crystallization and Subsequent Annealing

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Chinese Journal of Polymer Science 2018年第5期36卷 598-603页

作者： Yi-Ran Zheng Jie Zhang Xiao-Li Sun Hui-Hui Li Zhong-Jie Ren shou-ke yan State key Laboratory of Chemical Resource Engineering Beijing University of Chemical Technology

Poly（vinylidene fluoride）（PVDF） exhibits pronounced polymorphs. Its γ phase is attractive due to the electroactive properties. The γ-PVDF is however difficult to obtain under normal crystallization condition. In a previous work, we reported a simple melt-recrystallization approach for producing γ-phase rich PVDF thin films through selective melting and subsequent recrystallization. We reported here another approach for promoting the αγ′ phase transition to prepare γ-phase rich PVDF thin films. To this end, a stepwise crystallization and subsequent annealing process was used. The idea is based on a quick generation of a large amount of α-PVDF crystals with some of their γ-PVDF counterparts at suitable crystallization temperature and then annealing at a temperature above the crystallization temperature for enhancing the molecular chain mobility to overcome the energy barrier of phase transition. It was found that crystallizing the PVDF melt first at 152 °C for 4 h, then quenching to room temperature and finally annealing the sample at 160 °C for 100 h was the most efficient to produce γ-PVDF rich films. This is related to the melting and recrystallization of the α-PVDF crystals produced during quenching in the annealing process at 160 °C, which favors the formation of γ-PVDF crystals for triggering the αγ′ phase transition.

关键词： Poly(vinylidene fluoride) Step crystallization Annealing Phase transition

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The Effect of Substrate on the Properties of Non-volatile Ferroelectric P(VDF-TrFE)/P3HT Memory Devices

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Chinese Journal of Polymer Science 2022年第6期40卷 692-699页

作者： Xiao Chu Jia-Qian Kang Ya Hong Guo-Dong Zhu shou-ke yan Xue-Yun Wang Xiao-Li Sun State key Laboratory of Chemical Resource Engineering Beijing University of Chemical TechnologyBeijing 100029China School of Aerospace Engineering Beijing Institute of TechnologyBeijing 100081China Department of Materials Science Fudan UniversityShanghai 200433China key Laboratory of Rubber-Plastics Ministry of Education/Shandong Provincial Key Laboratory of Rubber-plasticsQingdao University of Science&TechnologyQingdao 266042China

Ferroelectric poly(vinylidene fluoride-trifluoroethylene)(P(VDF-TrFE))/semiconducting poly(3-hexyl thiophene)(P3HT)blend systems have drawn great attention with their potential use for electronic applications,particularly non-volatile memory *** is essential to grasp a full understanding of the crystallization habits of the two polymers on different substrates for purposeful control of the structures of the blend and therefore the properties of the ***,the effects of structure and morphology of the blend films generated at different substrate surfaces on the ferroelectric and switching properties of related devices are *** is identified that P(VDF-TrFE)/P3HT blend films prepared on graphene substrate show not only an obvious optimization in the ferroelectric behavior of P(VDF-TrFE),but also an enhancement of the charge transport within P3HT *** employing sandwich structure constructed by silver electrode and P3HT/P(VDF-TrFE)blend film on graphene substrate,high-performance ferroelectric memory devices have been obtained,which exhibit a great electrical switching behavior with high ON/OFF ratio of about 1000 and low coercive voltage of approximately 5 *** findings provide useful guidance for fabricating highperformance ferroelectric memory devices.

关键词： P(VDF-TrFE) P3HT Graphene Memory devices Ferroelectric properties

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Impact of Annealing on the Melt Recrystallization of a-PDLA/α-PLLA Double-layered Films

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Chinese Journal of Polymer Science 2024年第2期42卷 230-238,I0009页

作者： Yun-Peng Li Hao-Ran Shen Shao-Juan Wang Hao Zhang Jian Hu Rui Xin Xiao-Li Sun shou-ke yan key Laboratory of Rubber-Plastics Ministry of Education/Shandong Provincial Key Laboratory of Rubber-plasticsQingdao University of Science&TechnologyQingdao266042China State key Laboratory of Chemical Resource Engineering Beijing University of Chemical TechnologyBeijing100029China

Poly(lactic acid)(PLA) as a bio-based polymer with biodegradability and biocompatibility has attracted much attention. To manipulate its properties for different applications, regulation of crystal structure and crystalline morphology becomes an attractive research topic. In this work, the structure evolution of layered samples containing an amorphous poly(D-lactide)(PDLA) layer and a crystalline poly(L-lactide)(PLLA)layer with highly oriented edge-on α lamellar crystals after annealing at 150 ℃ or/and after melt-recrystallization has been studied by AFM, FTIR,and TEM combined with electron diffraction. The results demonstrate that melt recrystallization of the as-prepared sample leads to the formation of abundant randomly oriented PLA stereo-complex(PLA SC) crystals. Annealing at 150 ℃ results in the formation of a small amount of oriented PLA SC crystals at the interface. These PLA SC crystals show great impact on the recrystallization behavior of sample after melting at 190 ℃ and then crystallizing at 90 ℃. First, they impede the mutual diffusion of the overlying PDLA and underlying PLLA, and thus reduce their stereocomplexation ability as manifested by the decreased amount of PLA SC crystals. Second, they act as substrate to initiate the epitaxial crystallization of the overlying PDLA and underlying PLLA, which ensures the production of a highly oriented structure of PDLA and PLLA after melt recrystallization again.

关键词： Poly(L-lactide) Poly(D-lactide) Double layer Stereocomplex

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Influence of Freezing Layer on the Crystallization Kinetics of PCL on Oriented PE Film

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Chinese Journal of Polymer Science 2023年第5期41卷 778-786,I0010页

作者： Hao Zhang Ying-Xiao Song Na Li Shao-Juan Wang Jian Hu Rui Xin Jie Zhang Chun-Feng Song shou-ke yan key Laboratory of Rubber-Plastics Ministry of Education/Shandong Provincial Key Laboratory of Rubber-PlasticsQingdao University of Science&TechnologyQingdao 266042China State key Laboratory of Chemical Resource Engineering Beijing University of Chemical TechnologyBeijing 100029China

The effect of freezing layer on the crystallization kinetics of poly(ε-caprolactone)(PCL)thin and ultrathin films was investigated by monitor the growth process of it on oriented polyethylene(PE)and CaF_(2)with and without freezing layer,*** was found that the PCL films with similar thicknesses crystallize much faster on oriented PE than on CaF_(2)*** example,the crystallization rate constant of a 102 nm thick PCL film decreases tremendously by 3 orders of magnitude from 1.1×10^(-1) on PE substrate at 50℃to 7×10^(-4)on CaF_(2)surface at 40℃.Moreover,the crystallization of PCL accelerates on CaF_(2)surface while slows down at PE surface with increasing film *** ultrathin films of PCL with thickness less than 14 nm exhibits the fastest crystallization rate on oriented PE with a rate constant of about 3.5×10^(-1),which is 3 times higher than that of a ca.50 nm thick *** illustrates the great influence of freezing layer on the crystallization process of *** freezing layer thickness of PCL on PE is estimated to be in the range of 14-17 *** the radius of gyration(R_(g)~15.6 nm)of the used PCL material into account,the obtained results may imply the existence of a correlation between the R_(g)of PCL and its freezing layer thickness at PE substrate.

关键词： Poly(ε-caprolactone) Polyethylene Interface Freezing layer Crystallization kinetics

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Ordered Organization of Long Chain Polymers:Advances and Challenges

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Chinese Journal of Polymer Science 2022年第6期40卷 543-543页

作者： Quan Chen shou-ke yan State key Laboratory of Polymer Physics and Chemistry Changchun Institute of Applied Chemistry Chinese Academy of Sciences Beijing China State key Laboratory of Chemical Resource Engineering Beijing University of Chemical Technology Beijing China

Due to the long chain character and entanglement feature,polymer chains were initially believed incapable of organizing into ordered ***,X-ray studies in the 1920s demonstrated unequivocally the existence of ordered s... 详细信息

关键词： ordered polymer initially

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