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SIMULTANEOUS SAXS/WAXS/DSC STUDIES ON MICROSTRUCTURE OF CONVENTIONAL AND METALLOCENE-BASED ETHYLENE-BUTENE COPOLYMERS
作者姓名:Jun-tingXu  Bo-taoLi  Zhi-qiangFan
作者单位:DepartmentofPolymerScience&Engineering,ZhejiangUniversity,Hangzhou310027,China
基金项目:国家自然科学基金 , 国家重点基础研究发展计划(973计划)
摘    要:The fractions of one metallocene-based (mPE) and one conventional (znPE) ethylene-butene copolymer eluted at 80-82℃ from temperature rising elution fractionation were selected for DSC and time-resolved small angle X-ray scattering (SAXS) and wide angle X-ray scattering (WAXS) characterization. The DSC and WAXS results show that two crystal structures exist in both mPE and znPE: structure A with higher melting temperature and structure B with lower melting temperature. It was found that original znPE (s-znPE) contains more highly ordered structure A than original mPE (s-mPE) in spite of the higher comonomer content of znPE. Another structure C is also identified because of higher crystallinity measured by WAXS than by DSC and is attributed to the interfacial region. The SAXS data were analyzed with correlation function and two maxima were observed in s-mPE and s-znPE, in agreement with the conclusion of two crystal populations drawn from DSC and WAXS results. These two crystal populatiorts have close long periods in s-mPE, but very different long periods in s-znPE. In contrast, freshly crystallized mPE and znPE (f-mPE and f-znPE) contain only a single crystal population with a broader distribution of long period

关 键 词:小角X射线衍射  宽角X射线衍射  差示扫描量热法  显微结构  乙烯-丁烯共聚物  茂金属
收稿时间:2003-02-25
修稿时间:2003-05-28

SIMULTANEOUS SAXS/WAXS/DSC STUDIES ON MICROSTRUCTURE OF CONVENTIONAL AND METALLOCENE-BASED ETHYLENE-BUTENE COPOLYMERS*
Jun-tingXu Bo-taoLi Zhi-qiangFan.SIMULTANEOUS SAXS/WAXS/DSC STUDIES ON MICROSTRUCTURE OF CONVENTIONAL AND METALLOCENE-BASED ETHYLENE-BUTENE COPOLYMERS*[J].Chinese Journal of Polymer Science,2004,0(3):279-287.
Authors:Jun-ting Xu  Bo-tao Li  Zhi-qiang Fan  Anthony J Ryan
Institution:Department of Polymer Science & Engineering, Zhejiang University, Hangzhou 310027, China Chemistry Department, The University of Sheffield, Sheffield S3 7HF, UK
Abstract:The fractions of one metallocene-based (mPE) and one conventional (znPE) ethylene-butene copolymer eluted at 80-82℃ from temperature rising elution fractionation were selected for DSC and time-resolved small angle X-ray scattering (SAXS) and wide angle X-ray scattering (WAXS) characterization. The DSC and WAXS results show that two crystal structures exist in both mPE and znPE: structure A with higher melting temperature and structure B with lower melting temperature. It was found that original znPE (s-znPE) contains more highly ordered structure A than original mPE (s-mPE)in spite of the higher comonomer content of znPE. Another structure C is also identified because of higher crystallinity measured by WAXS than by DSC and is attributed to the interfacial region. The SAXS data were analyzed with correlation function and two maxima were observed in s-mPE and s-znPE, in agreement with the conclusion of two crystal populations drawn from DSC and WAXS results. These two crystal populations have close long periods in s-mPE, but very different long periods in s-znPE. In contrast, freshly crystallized mPE and znPE (f-mPE and f-znPE) contain only a single crystal population with a broader distribution of long period.
Keywords:SAXS  WAXS  Microstructure  Metallocene  Ethylene-butene copolymer  SAXS  WAXS  COPOLYMERS  CONVENTIONAL  MICROSTRUCTURE  single crystal  population  distribution  long period  contrast  different  periods  data  correlation function  maxima  crystallinity  interfacial  region  content  ordered structure
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