Dynamic mechanical properties of random ethylene/1-octene copolymers prepared by rapid cooling

被引：0
|
作者：
Guan, Xiaoping [1 ]
Phillips, Paul J. [1 ]
机构：
[1] Department of Materials Science and Engineering, University of Tennessee, Knoxville, TN 37996-2000, United States
来源：
European Polymer Journal | 2007年 / 43卷 / 04期
关键词：
The dynamic mechanical properties of a well-characterized series of homogeneous ethylene/1-octene copolymers with different random hexyl branch contents and prepared using different cooling conditions have been examined using dynamic mechanical analysis (DMA). It was confirmed that the relaxation behavior of copolymers varied continuously with the branch content: the magnitude of the β relaxation increased with branch content while the intensity of the α relaxation decreased with the branch content; both relaxation temperatures decreasing with increasing branch level in the copolymers. Copolymers prepared at different cooling conditions were further examined and strikingly continuous changes were found for the first time. The β relaxation was shown to correlate to the amorphous region; while the α1 and α2 relaxations can be clearly differentiated for some samples and are assumed to be associated with the interlamellar slip and intra-crystalline c-shear processes respectively. With increasing cooling rate; the relative intensity of α1 relaxation to α2 relaxation was found to decrease while the β relaxation did not change. The most informative data is determined from deconvolution of tan δ spectra. In higher crystallinity polymers the α1 and α2 relaxations are closely related in activation energy but have different temperature locations. For lower crystallinity systems; where the α1 relaxation cannot be observed; the α2 and β relaxations are closely linked; with activation energies approaching one another. These results show very clearly that; although the observed relaxation data can be separated through deconvolution into three separate peaks; the behaviors are closely linked. Presumably; this a clear reflection of the role of tie molecules in binding phases together and in influencing dynamic mechanical behavior. A clear change of behavior has also been observed in the β relaxation when a distinct amorphous phase exists outside of the spherulites; confirming the general belief that the crystalline phase influences the amorphous phase when it is confined within a spherulite. Again; this behavior is reflecting the role of tie molecules in binding together the nanocomposite structure of a spherulite. © 2007 Elsevier Ltd. All rights reserved;
D O I：
暂无
中图分类号：
学科分类号：
摘要：
Journal article (JA)
引用
收藏
页码：1219 / 1233
相关论文
共 50 条
  • [1] Dynamic mechanical properties of random ethylene/l-octene copolymers prepared by rapid cooling
    Guan, Xiaoping
    Phillips, Paul J.
    EUROPEAN POLYMER JOURNAL, 2007, 43 (04) : 1219 - 1233
  • [2] Influence of the comonomer content on the thermal and dynamic mechanical properties of metallocene ethylene/1-octene copolymers
    Simanke, AG
    Galland, GB
    Freitas, L
    da Jornada, JAH
    Quijada, R
    Mauler, RS
    POLYMER, 1999, 40 (20) : 5489 - 5495
  • [3] Mathematical Model of Dynamic Crystallization of Ethylene/1-Octene Copolymers
    Chokputtanawuttilerd, Nuttawat
    Anantawaraskul, Siripon
    Soares, Joao B. P.
    MACROMOLECULAR SYMPOSIA, 2013, 330 (01) : 132 - 141
  • [4] Structure formation of random isotactic copolymers of propylene and 1-hexene or 1-octene at rapid cooling
    Mileva, Daniela
    Androsch, Rene
    Cavallo, Dario
    Alfonso, Giovanni C.
    EUROPEAN POLYMER JOURNAL, 2012, 48 (06) : 1082 - 1092
  • [5] Effect of Operating Conditions on Dynamic Crystallization of Ethylene/1-Octene Copolymers
    Chokputtanawuttilerd, Nuttawat
    Anantawaraskul, Siripon
    Alghyamah, Abdulaziz A.
    Soares, Joao B. P.
    MACROMOLECULAR CHEMISTRY AND PHYSICS, 2013, 214 (22) : 2591 - 2601
  • [6] Structure and Mechanical Properties of Ethylene/1-Octene Multiblock Copolymers from Chain Shuttling Technology
    Auriemma, Finizia
    De Rosa, Claudio
    Scoti, Miriam
    Di Girolamo, Rocco
    Malafronte, Anna
    D'Alterio, Massimo Christian
    Boggioni, Laura
    Losio, Simona
    Boccia, Antonella Caterina
    Tritto, Incoronata
    MACROMOLECULES, 2019, 52 (07) : 2669 - 2680
  • [7] Elastomeric properties of ethylene/1-octene random and block copolymers synthesized from living coordination polymerization
    Liu, Weifeng
    Zhang, Xiao
    Bu, Zhiyang
    Wang, Wen-Jun
    Fan, Hong
    Li, Bo-Geng
    Zhu, Shiping
    POLYMER, 2015, 72 : 118 - 124
  • [8] Hybrid blends of similar ethylene 1-octene copolymers
    Rana, D
    Kim, HL
    Kwag, H
    Choe, S
    POLYMER, 2000, 41 (19) : 7067 - 7082
  • [9] Blends of high density polyethylene and ethylene/1-octene copolymers: Structure and properties
    Adhikari, Rameshwar
    Godehardt, Reinhold
    Lebek, Werner
    Michler, Goerg H.
    Journal of Applied Polymer Science, 1600, 103 (03): : 1887 - 1893
  • [10] Properties of Poly(ethylene 1-octene)-g-Maleic Anhydride Copolymers Prepared via Solvothermal Process
    Qi, Rongrong
    Liu, Qiaochu
    Wang, Yanling
    Huang, Mark
    JOURNAL OF APPLIED POLYMER SCIENCE, 2009, 111 (02) : 1069 - 1075
12345