1998 Fiscal Year Annual Research Report

高純度高分子の結晶化の分子量依存性による核生成・成長機構の実体的解明

Research Project

Project/Area Number	09450364
Research Institution	HIROSHIMA UNIVERSITY
Principal Investigator	彦坂正道広島大学, 総合科学部, 教授 (60087103)
Co-Investigator(Kenkyū-buntansha)	戸田昭彦広島大学, 総合科学部, 助教授 (70201655)
Keywords	高分子 / 結晶化 / 核生成 / 分子量
Research Abstract	高純度で分子量の揃ったポリエチレンとポリプロピレンを用いて、高分子の結晶化の分子量依存性を初めて明らかにし、それを手がかりにして核生成と成長の分子論的メカニズムを提唱した。ポリエチレンの核生成速度は折りたたみ鎖結晶の場合にも分子量のべき乗に比例して減少することが明らかになった。これにより、先に我々が伸びきり鎖結晶について初めて見いだした「核生成速度のべき乗則」が結晶形態によらずに普遍的に成り立つことが示された。また、ポリプロピレンの沿面成長速度も分子量のべき乗則に従っていることが見いだされ、「べき乗則」が結晶化において普遍的である可能性が示された。これらのべき乗則を「核生成は高分子が融液中での絡み合いをとき、再配列する過程である」という高分子のトポロジー的本性を組み入れた我々のモデルによって説明できることを示した。結晶化や融解の過程における(熱力学的量である)比熱と潜熱とを温度変調型の走査型の示差熱熱量計を用いて分離・評価する方法を提唱し、その有効性を数種の高分子について確認し、結晶化メカニズムの新たな角度からの研究に有効であることを示した。

Research Products

(13 results)

All Other

All Publications (13 results)

[Publications] S.K.Ghosh,J.Matsuba,S.Komura,H.Seto,T.Takeda and M.Hikosaka,: "Phase transiton between microemulsion and lamellar phase in C12E5/water/n-octane amphilic system" J.Appl.Crystallography,. 37. 919-924 (1998)
[Publications] K.Yamada,S.Matsumoto and K.Tagashira and M.Hikosaka: "Isotacticity dependence of spherultic morphology of isotactic polypropylene." Polymer. 39. 5327-5333 (1998)
[Publications] M.Nishi,A.Toda,M.Takahashi and M.Hikosaka,: "Molecular wieght dependence of lateral growth rate of polyethylene(1)… an extended chain single crystal…." Polymer. 39. 1591-1596 (1998)
[Publications] Radhakrishnan,K.Ichikawa,K.Yamada,A.Toda and M.Hikosaka: "Nearly pure α 2 Crystals obtained by Melt Crystallization of High Tacticity isotactic Polypropylene," Polymer. 39. 2995-2997 (1998)
[Publications] M.Nagao,H.Seto,D.Okuhara,H.Okabayashi,T.Takeda and M.Hikosaka: "A small angle neutron scattering study of a pressure effect on structures in a ternary microemulsion system." Physica B. 241-243. 970-972 (1998)
[Publications] M.Okada,M.Takahashi,H.Matsuda M.Nishi,A.Toda and M.Hikosaka,: "Molecular wieght dependence of lateral growth rate of polyethylene(2)… folded chain crystals…" Polymer. 39. 4535-4539 (1998)
[Publications] A.Toda.C.Tomita.M.Hikosaka and Y.Saruyama: "An application of Temperature Modulated DSC to the exothermic process of poly(ethylene terephthalate)crystallization" Polymer. 38. 2849-2852 (1997)
[Publications] A.Toda.T.Oda.M.Hikosaka and Y.Saruyama: "A new analyzing method of temperature modulated DSC of exo-or endo-thermic process:Application to polyethylene crystallization" Thermochimica Acta. 293. 47-64 (1997)
[Publications] A.Toda.C.Tomita,M.Hikosaka and Y.Saruyama: "Temperature Modulated DSC study of poly(ethylene terephthalate)crystallization II:applicability to non-isothermal process" Polymer. 39. 1439-1443 (1998)
[Publications] A.Toda.C.Tomita,M.Hikosaka and Y.Saruyama: "Melting of polymer crystals observed by Temperature Modulated DSC and its kinetic modelling" Polymer. 39. 5093-5104 (1998)
[Publications] A.Toda.C.Tomita,M.Hikosaka and Y.Saruyama: "Kinetics of irreversible melting of polyethylene crystals revealed by Temperature Modulated DSC" Thermochimica Acta. 324. 95-108 (1998)
[Publications] A.Toda.C.Tomita and M.Hikosaka: "Temperature Modulated DSC of irreversible melting of nylon 6 crystals" Journal of Thermal Analysis and Calorimetry. 54. 623-635 (1998)
[Publications] K.Nozaki and M.Hikosaka,: "Kinetic study on the rotator phase transition on n-alkane:growth of the rotator phase," Jpn.J.Appl.Phys.37. 3450-3456 (1998)

1998 Fiscal Year Annual Research Report

高純度高分子の結晶化の分子量依存性による核生成・成長機構の実体的解明

Principal Investigator

彦坂 正道 広島大学, 総合科学部, 教授 (60087103)

Research Products

[Publications] S.K.Ghosh,J.Matsuba,S.Komura,H.Seto,T.Takeda and M.Hikosaka,: "Phase transiton between microemulsion and lamellar phase in C12E5/water/n-octane amphilic system" J.Appl.Crystallography,. 37. 919-924 (1998)

[Publications] K.Yamada,S.Matsumoto and K.Tagashira and M.Hikosaka: "Isotacticity dependence of spherultic morphology of isotactic polypropylene." Polymer. 39. 5327-5333 (1998)

[Publications] M.Nishi,A.Toda,M.Takahashi and M.Hikosaka,: "Molecular wieght dependence of lateral growth rate of polyethylene(1)… an extended chain single crystal…." Polymer. 39. 1591-1596 (1998)

[Publications] Radhakrishnan,K.Ichikawa,K.Yamada,A.Toda and M.Hikosaka: "Nearly pure α 2 Crystals obtained by Melt Crystallization of High Tacticity isotactic Polypropylene," Polymer. 39. 2995-2997 (1998)

[Publications] M.Nagao,H.Seto,D.Okuhara,H.Okabayashi,T.Takeda and M.Hikosaka: "A small angle neutron scattering study of a pressure effect on structures in a ternary microemulsion system." Physica B. 241-243. 970-972 (1998)

[Publications] M.Okada,M.Takahashi,H.Matsuda M.Nishi,A.Toda and M.Hikosaka,: "Molecular wieght dependence of lateral growth rate of polyethylene(2)… folded chain crystals…" Polymer. 39. 4535-4539 (1998)

[Publications] A.Toda.C.Tomita.M.Hikosaka and Y.Saruyama: "An application of Temperature Modulated DSC to the exothermic process of poly(ethylene terephthalate)crystallization" Polymer. 38. 2849-2852 (1997)

[Publications] A.Toda.T.Oda.M.Hikosaka and Y.Saruyama: "A new analyzing method of temperature modulated DSC of exo-or endo-thermic process:Application to polyethylene crystallization" Thermochimica Acta. 293. 47-64 (1997)

[Publications] A.Toda.C.Tomita,M.Hikosaka and Y.Saruyama: "Temperature Modulated DSC study of poly(ethylene terephthalate)crystallization II:applicability to non-isothermal process" Polymer. 39. 1439-1443 (1998)

[Publications] A.Toda.C.Tomita,M.Hikosaka and Y.Saruyama: "Melting of polymer crystals observed by Temperature Modulated DSC and its kinetic modelling" Polymer. 39. 5093-5104 (1998)

[Publications] A.Toda.C.Tomita,M.Hikosaka and Y.Saruyama: "Kinetics of irreversible melting of polyethylene crystals revealed by Temperature Modulated DSC" Thermochimica Acta. 324. 95-108 (1998)

[Publications] A.Toda.C.Tomita and M.Hikosaka: "Temperature Modulated DSC of irreversible melting of nylon 6 crystals" Journal of Thermal Analysis and Calorimetry. 54. 623-635 (1998)

[Publications] K.Nozaki and M.Hikosaka,: "Kinetic study on the rotator phase transition on n-alkane:growth of the rotator phase," Jpn.J.Appl.Phys.37. 3450-3456 (1998)

彦坂正道広島大学, 総合科学部, 教授 (60087103)