Diluent Segregation in Crystalline/Amorphous Poly (vinylidene fluoride)/Poly (vinyl acetate) Blends. Segregation Distance Dominated by the Crystal Growth Kinetics

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We systematically studied the effects of composition and crystallization temperature (<I>T<FONT SIZE="-1"><SUB>c</SUB></FONT></I>) on the morphological patterns of poly(vinylidene fluoride) (PVDF)/poly(vinyl acetate) (PVAc) blends by means of small angle X-Ray scattering (SAXS). The absolute intensity was measured so that the morphological structures can be resolved from the intensity perturbation. The scattering intensity associated with the PVDF lamellar stacks was strongly enhanced upon blending with PVAc. This was due to the presence of amorphous PVAc in the interlamellar regions that enhanced the electron density contrast between the crystalline and amorphous layers. Except for an intermediate <I>T<FONT SIZE="-1"><SUB>c</SUB></FONT></I> of 110<FONT SIZE="-1"><SUP>°</SUP></FONT>C where the systems attained the maximum crystal growth rate, partial extralamellar segregation of PVAc became prevalent when the PVAc composition exceeded 20 or 30 wt%. Even crystallization at as low as 20<FONT SIZE="-1"><SUP>°</SUP></FONT>C (where the diluent mobility was expected to be sluggish) produced a large extent of extralamellar segregation due to slow crystal growth. The results suggested that the crystal growth kinetics has dominated over the diluent mobility in controlling the average distance of diluent segregation in PVDF/PVAc with the prescribed molecular weight combination.

収録刊行物

  • Polymer journal

    Polymer journal 34(5), 356-362, 2002-05-15

    社団法人 高分子学会

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各種コード

  • NII論文ID(NAID)
    10012291028
  • NII書誌ID(NCID)
    AA00777013
  • 本文言語コード
    ENG
  • 資料種別
    ART
  • ISSN
    00323896
  • NDL 記事登録ID
    6179231
  • NDL 雑誌分類
    ZP16(科学技術--化学・化学工業--高分子化学・高分子化学工業)
  • NDL 請求記号
    Z53-R487
  • データ提供元
    CJP書誌  NDL  J-STAGE 
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