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Influence ofβ-nucleating Compound Agents on the Mechanical Properties and Crystallization Behavior of Polypropylene Random Copolymer 被引量:2
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作者 谷亚新 LIU Yunxue +3 位作者 FAN Zhaorong GUI Jianfeng 刘鹏 WANG Hongmei 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS CSCD 2023年第1期237-243,共7页
A novel polypropylene random(PPR)composite materials with optimized properties was developed by addingβ-nucleating compound agents(rare earth complex WBG-2 and aryl amide derivative TMB-5)and ternary compound modifie... A novel polypropylene random(PPR)composite materials with optimized properties was developed by addingβ-nucleating compound agents(rare earth complex WBG-2 and aryl amide derivative TMB-5)and ternary compound modifier(TPE/WBG-2/CaCO_(3)).The effects of differentβ-nucleating agents and ternary compound modifier on the mechanical properties and crystallization behavior of PPR were analyzed.The results show that,compared with pure PPR materials,both WBG-2 and TMB-5 could significantly improve the impact strength of PPR.The crystallization temperature of PPR increased with the addition ofβ-nucleating agent.The modified PPR prepared with ternary compound modifier showed the most excellent comprehensive properties. 展开更多
关键词 polypropylene random copolymer β-nucleating agent impact strength crystallization behavior
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CRYSTALLIZATION CHARACTERISTICS OF β-PHASE CRYSTALS IN COPOLYMERS OF POLYPROPYLENE WITH LOW ETHYLENE CONTENT 被引量:1
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作者 Wen-tao Hao Yi-yong He +1 位作者 Xiao-lie Luo De-zhu Ma Department of Polymer Science and Engineering University of Science and Technology of China Hefei 230026 China 《Chinese Journal of Polymer Science》 SCIE CAS CSCD 2001年第3期317-322,共6页
Polypropylene copolymers (CPP) containing β-nucleating agent were investigated by differential scanningcalorimetry (DSC), wide-angle X-ray diffraction (WAXD) and polarizing light microscopy (PLM). The results show th... Polypropylene copolymers (CPP) containing β-nucleating agent were investigated by differential scanningcalorimetry (DSC), wide-angle X-ray diffraction (WAXD) and polarizing light microscopy (PLM). The results show thathigh content of β-phase crystals can also be formed for CPPs. Like PP homopolymers, the CPPs also have a most favorabletemperature near 132℃ for β-phase crystal growth. The crystallization rate of CPPs containing β-nucleating agent (β-CPP) ismuch greater than that of PP homopolymer containing β-nucleating agent (β-PP homopolymer). The observation ofspherulite morphology of β-CPP and β-PP homopolymer shows that the spherulites of β-CPP are more imperfect than thoseof β-PP homopolymer. 展开更多
关键词 Copolymer polypropylene β-nucleating agent Differential scanning calorimetry Wide angle X-ray diffraction SPHERULITE
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Effect of Annealing Temperature on Low-temperature Toughness of β-Nucleated Polypropylene Random Copolymer/Ethylene-Propylene-Diene Terpolymer Blends 被引量:4
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作者 丁会利 Li-yuan Guo +3 位作者 Dong-jing Li De Zheng Jun Chen Yu-ying Qian 《Chinese Journal of Polymer Science》 SCIE CAS CSCD 2015年第2期256-264,共9页
In this study, the effect of annealing temperature on the impact toughness of β-nucleated polypropylene random copolymer(PPR) and ethylene-propylene-diene terpolymer(EPDM) blends was investigated by differential ... In this study, the effect of annealing temperature on the impact toughness of β-nucleated polypropylene random copolymer(PPR) and ethylene-propylene-diene terpolymer(EPDM) blends was investigated by differential scanning calorimetry(DSC), wide-angle X-ray diffraction(WAXD), dynamic mechanical analysis(DMA) and scanning electron microscopy(SEM). Interestingly, the impact strength of β-PPR/20 EPDM blend annealed at 120 ℃ is 1.8 times as high as that of unannealed samples. In addition, the crystalline structure, the relaxation of chain segments and fracture morphology of β-PPR/EPDM blends were also investigated to explore the toughening mechanism related to annealing. The results show that annealing at moderate temperatures results in the improvement of integrity of the crystal structure and the relative content of β-phase. The work provides a possible method to toughen the semicrystalline polymer at low temperatures by annealing. 展开更多
关键词 Polypropylene EPDM β-nucleating agent Annealing TOUGHENING
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Simultaneous Enhancement of Toughness and Strength of Stretched iPP Film via Tiny Amount of β-Nucleating Agent under “Shear-free” Melt-extrusion 被引量:2
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作者 Zhong-Zhu Liu Guo-Qiang Zheng +4 位作者 Hong-Hui Shi Chun-Tai Liu Li-Wei Mi Qian Li Xian-Hu Liu 《Chinese Journal of Polymer Science》 SCIE CAS CSCD 2021年第11期1481-1488,共8页
Herein,isotactic polypropylene films with smallβ-nucleating agent content were fabricated via a melt-extrusion-stretched technology with intended"shear-free"in barrel and die.Compared with neat films,the te... Herein,isotactic polypropylene films with smallβ-nucleating agent content were fabricated via a melt-extrusion-stretched technology with intended"shear-free"in barrel and die.Compared with neat films,the tensile strength,elongation at break and strain energy density at break of i PP film with 0.05 wt%β-nucleating agent are significantly improved by 13.8%,39.6%and 90.6%,respectively,indicating the simultaneously enhanced toughness and strength.Additionally,theβ-crystal content gradually increases with increasingβ-NA content,while the relative total daughter content ofα-andβ-crystal exhibits opposite tendency.Moreover,nucleation and crystal growth induced by variousβ-NA contents are different.This work proves an efficient strategy to enhance mechanical properties of isotactic polypropylene film via controlling elongation flow and addition of appropriateβ-NA content. 展开更多
关键词 Melt-extrusion Isotactic polypropylene β-nucleating agent Crystallization Mechanical properties
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Mechanistic Insights into the Shear Effects on Isotactic Polypropylene Crystallization Containingβ-Nucleating Agent 被引量:2
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作者 Bao-jing Luo Hong-fei Li +5 位作者 Wen-yang Zhang Cheng-bo Zhou Jing-qing Li Cong-hua Lu Xue-hao He 蒋世春 《Chinese Journal of Polymer Science》 SCIE CAS CSCD 2017年第5期672-680,共9页
The crystalline structures and crystallization behaviors of iPP containing β nucleation agent TMB-5 (iPP/TMB-5) were investigated by synchrotron radiation wide angel X-ray diffraction (SR-WAXD), differential scan... The crystalline structures and crystallization behaviors of iPP containing β nucleation agent TMB-5 (iPP/TMB-5) were investigated by synchrotron radiation wide angel X-ray diffraction (SR-WAXD), differential scanning calorimeter (DSC) and polarized light microscope (PLM). It was found that α-crystallization lagged behind β-crystallization at normal temperatures, but the discrepancy reduced with increasing temperature. TMB-5 could not induce β-iPP when the nucleation agent is wrapped up with α-crystal that crystallized at high temperatures. The polymorphic composition of iPP/TMB-5 was susceptible to the introductory moment of shear. New crystallization process of β-nucleated iPP was proposed to understand the experimental phenomena which could not be explained by those reported in the literature. It was supposed that polymer crystallization initiated from mesophase, and the formations of iPP crystals involved the organization of helical conformation ordering within rnesophase. It was proposed that the iPP melt contained mesophases with stereocomplex-type ordering of right-handed and left-handed helical chains which could be disturbed by shear or TMB-5, leading to different polymorphic structures. 展开更多
关键词 Isotactic polypropylene β-nucleating agent and shear induced crystallization Mechanism of β-iPP formation MESOPHASE Helical conformation and chiral structures
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Morphology, Crystallization Behavior and Tensile Properties of β-Nucleated Isotactic Polypropylene Fibrous Membranes Prepared by Melt Electrospinning
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作者 Li Cao Dun-fan Su +1 位作者 苏志强 陈晓农 《Chinese Journal of Polymer Science》 SCIE CAS CSCD 2014年第9期1167-1175,共9页
β-nucleated isotactic polypropylene (iPP) fibers with diameters less than 5 Hm were prepared through melt electrospinning. The effects of electrospiuning process and rare earth β-nucleating agent (WBG) on the cr... β-nucleated isotactic polypropylene (iPP) fibers with diameters less than 5 Hm were prepared through melt electrospinning. The effects of electrospiuning process and rare earth β-nucleating agent (WBG) on the crystal structure of iPP fibers were investigated. The results indicate that the addition of WBG can improve the fluidity of iPP melt remarkably and help the formation of fine fibers with thinner diameter, while the electrostatic force applied on the iPP melt is not favorable for the formation of β-crystal in iPP fibers. In addition, the morphology and crystalline structure of WBG/iPP electrospun fibers depended on the content of WBG. Both the crystallinity and the percentage of β-crystal form of WBG/iPP electrospun fibers increase with the rise of the content of nucleating agent, which endows the prepared electrospun fibers excellent mechanical properties. The β-nucleated iPP electrospun fibrous membranes prepared in this study can be used for protective clothing material, filtration media, reinforcement for composites and tissue engineering scaffolds. 展开更多
关键词 Melt electrospinning β-nucleating agent CRYSTALLIZATION Polypropylene.
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