Lamellar assembly corresponding to transitions of positively to negatively birefringent spherulites in poly(ethylene adipate) with phenoxy

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• 作者：Graecia Lugito (1)
  Eamor M. Woo (1)
  
• 关键词：Atomic force microscopy ; Positive type spherulite ; Poly(ethylene adipate) ; Phenoxy
• 刊名：Colloid & Polymer Science
• 出版年：2013
• 出版时间：April 2013
• 年：2013
• 卷：291
• 期：4
• 页码：817-826
• 全文大小：1139KB
• 参考文献：1. Murayama E (2002) Optical properties of ringed spherulites. Polymer Preprints Japan 51:460-62
  2. Sasaki S, Sakaki Y, Takahara A, Kajiyama T (2002) Microscopic lamellar organization in high-density polyethylene banded spherulites studied by scanning probe microscopy. Polymer 43:3441-446 CrossRef
  3. Markey L, Janimak JJ, Stevens GC (2001) Modeling and simulation of the permanganic etching of banded spherulitic polyethylene: correlation with AFM observations. Polymer 42:6221-230 CrossRef
  4. Ivanov DA, Jonas AM (1998) Isothermal growth and reorganization upon heating of a single poly(aryl ?ether ?ether ?ketone) (peek) spherulite, as imaged by atomic force microscopy. Macromolecules 31:4546-550 CrossRef
  5. Li L, Chan CM, Li JX, Ng KM, Yeung KL, Weng LT (1999) A direct observation of the formation of nuclei and the development of lamellae in polymer spherulites. Macromolecules 32:8240-242 CrossRef
  6. Chen J, Yang D (2004) Nature of the ring-banded spherulites in blends of aromatic poly(ether ketone)s. Macromol Rapid Commun 25:1425-428 CrossRef
  7. Fr?msdorf A, Woo EM, Lee LT, Chen YF, F?rster S (2008) Atomic force microscopy characterization and interpretation of thin-film poly(butylene adipate) spherulites with ring bands. Macromol Rapid Commun 29:1322-328 CrossRef
  8. Woo EM, Wu PL, Wu MC, Yen KC (2006) Thermal behavior of ring-band versus Maltese-cross spherulites: case of monomorphic poly(ethylene adipate). Macromol Chem Phys 207:2232-243 CrossRef
  9. Meyer A, Yen KC, Li SH, F?rster S, Woo EM (2010) Atomic-force and optical microscopy investigations on thin-film morphology of spherulites in melt-crystallized poly(ethylene adipate). Ind Eng Chem Res 49:12084-2092 CrossRef
  10. Wang Z, Hu Z, Chen Y, Gong Y, Huang H, He T (2007) Rhythmic growth-induced concentric ring-banded structures in poly(ε-caprolactone) solution-casting films obtained at the slow solvent evaporation rate. Macromolecules 40:4381-385 CrossRef
  11. Wang Z, Alfonso GC, Hu Z, Zhang J, He T (2008) Rhythmic growth-induced ring-banded spherulites with radial periodic variation of thicknesses grown from poly(ε-caprolactone) solution with constant concentration. Macromolecules 41:7584-595 CrossRef
  12. Maillard D, Prud’homme RE (2008) Crystallization of ultrathin films of polylactides: from chain chirality to lamella curvature and twisting. Macromolecules 41:1705-712 CrossRef
  13. Chen J, Yang D (2005) Phase behavior and rhythmically grown ring-banded spherulites in blends of liquid crystalline poly(aryl ether ketone) and poly(aryl ether ether ketone). Macromolecules 38:3371-379 CrossRef
  14. Woo EM, Wang LY, Nurkhamidah S (2012) Crystal lamellae of mutually perpendicular orientations by dissecting onto interiors of poly(ethylene adipate) spherulites crystallized in bulk form. Macromolecules 45:1375-383 CrossRef
  15. Shi W, Yang J, Zhang Y, Luo J, Liang Y, Han CC (2012) Lamellar orientation inversion under dynamic interplay between crystallization and phase separation. Macromolecules 45:941-50 CrossRef
  16. Marentette JM, Brown GR (1993) Polymer spherulites: I. Birefringence and morphology. J Chem Edu 70:435-39 CrossRef
  17. Liu YX, Chen EQ (2010) Polymer crystallization of ultrathin films on solid substrates. Coord Chem Rev 254:1011-037 CrossRef
  18. Duan Y, Jiang Y, Jiang S, Li L, Yan S, Schultz JM (2004) Depletion-induced nonbirefringent banding in thin isotactic polystyrene thin films. Macromolecules 37:9283-286 CrossRef
  19. Duan Y, Zhang Y, Yan S, Schultz JM (2005) In situ AFM study of the growth of banded hedritic structures in thin films of isotactic polystyrene. Polymer 46:9015-021 CrossRef
  20. Norton DR, Keller A (1985) The spherulitic and lamellar morphology of melt-crystallized isotactic polypropylene. Polymer 26:704-16 CrossRef
  21. Chen J, Yang D (2007) Rhythmic growth of ring-banded spherulites in blends of liquid crystalline methoxy-poly(aryl ether ketone) and poly(aryl ether ether ketone). J Polym Sci B Polym Phys 45:3011-024 CrossRef
  22. Lotz B, Cheng SZD (2005) A critical assessment of unbalanced surface stresses as the mechanical of twisting and scrolling of polymer crystals. Polymer 46:577-10 CrossRef
  23. Ye HM, Xu J, Guo BH, Iwata T (2009) Left- or right-handed lamellar twists in poly[(r)-3-hydroxyvalerate] banded spherulite: dependence on growth axis. Macromolecules 42:694-01 CrossRef
  24. Li Y, Huang H, He T, Wang Z (2012) Rhythmic growth combined with lamellar twisting induces poly(ethylene adipate) nested ring-banded structure. ACS Macro Lett 1:154-58 CrossRef
  
• 作者单位：Graecia Lugito (1)
  Eamor M. Woo (1)
  
  1. Department of Chemical Engineering, National Cheng Kung University, Tainan, 701-01, Taiwan
  
• ISSN：1435-1536

文摘

Surface morphology of positively or negatively birefringent spherulites in melt-crystallized neat poly(ethylene adipate) (PEA) vs. PEA blend with phenoxy was examined using atomic force microscopy (AFM), scanning electron microscopy, polarizing optical microscopy, thermal analysis, and wide-angle X-ray techniques. Their top-surface morphology in thin film forms was analyzed to fully expounded the lamellar assembly responsible for the opposite birefringence. Top-surface lamellar assemblies in positive/negative types of ringless spherulites (T c = 0, 15, 20, 40?°C) and also alternating birefringence of double-ring-banded spherulite (T c = 28?°C) of PEA/phenoxy blend were examined with AFM. From the results, spherulite’s positive and negative birefringence differs only in interior lamellar arrangements but not lattice geometries. Negative spherulites are composed of radially oriented edge-on lamellae, while positive spherulites are composed of bending/coiling edge-on lamellae. By contrast, the ring-banded spherulites can exhibit both negative and positive birefringence depending on the alternating radial and tangential lamellar arrangement. The addition of phenoxy into PEA could disrupt the regular lamellar bending and promote the singularity of edge-on lamellae; owing to that, the amorphous phenoxy induces looser arrangement of edge-on lamellae with phenoxy being in interlamellar/interfibrillar regions. The bulky linking pendent group phenoxy, with H-bonding capacity interacting with PEA, also disrupts the regularity of tangential–radial PEA lamellae to display a more zigzag pattern.