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In polymer physics, spherulites (from Greek sphaira = ball and lithos = stone) are spherical semicrystalline regions inside non-branched linear polymers. Their formation is associated with crystallization of polymers from the melt and is controlled by several parameters such as the number of nucleation sites, structure of the polymer molecules, cooling rate, etc. Depending on those parameters, spherulite diameter may vary in a wide range from a few micrometers to millimeters. Spherulites are composed of highly ordered lamellae, which result in higher density, hardness, but also brittleness when compared to disordered regions in a polymer. The lamellae are connected by amorphous regions which provide elasticity and impact resistance. Alignment of the polymer molecules within the lamellae re

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  • Der Begriff Sphärolith (von altgriechisch σφαῖρα sphaîra ‚Kugel‘ und altgriechisch λίθος líthos ‚Stein‘) bezeichnet allgemein ein kugeliges oder strahliges Kristallaggregat. In der Polymerphysik wird als Sphärolith eine für thermoplastische Kunststoffe typische kugelförmige Überstruktureinheit bezeichnet, in der Kristallite radialsymmetrisch angeordnet und über amorphe Zwischenbereiche fest verbunden sind. Die Größe und die Anzahl der Sphärolithe in einem Werkstück beeinflusst ganz wesentlich dessen mechanische und optische Eigenschaften. (de)
  • In polymer physics, spherulites (from Greek sphaira = ball and lithos = stone) are spherical semicrystalline regions inside non-branched linear polymers. Their formation is associated with crystallization of polymers from the melt and is controlled by several parameters such as the number of nucleation sites, structure of the polymer molecules, cooling rate, etc. Depending on those parameters, spherulite diameter may vary in a wide range from a few micrometers to millimeters. Spherulites are composed of highly ordered lamellae, which result in higher density, hardness, but also brittleness when compared to disordered regions in a polymer. The lamellae are connected by amorphous regions which provide elasticity and impact resistance. Alignment of the polymer molecules within the lamellae results in birefringence producing a variety of colored patterns, including a Maltese cross, when spherulites are viewed between crossed polarizers in an optical microscope. (en)
  • 高分子物理学において球晶(spherulites)とは、非分枝の直鎖状ポリマーによく見られる、球状の。溶融状態のポリマーを冷却することで生成する。球晶の形状は、ポリマーの分子構造、核となる物質の量、冷却速度など、多くの要素の影響を受ける。球晶の大きさは条件で大きく異なり、数μmから数mmになることもある。球晶自体はポリマーの規則的な配列()から成るため高密度で丈夫である。球晶同士は、アモルファス(球晶にならなかった)状態のポリマーで結合されている。ただし球晶同士の結合力は小さいため、大きな球晶を数多く含む材料は脆い場合が多い。球晶は、その中心からラメラ構造が放射状に広がっているため、ラメラの持つ複屈折の性質により、 光学顕微鏡で観察すると十字状の模様がみられる。 (ja)
  • La sferulite è una regione semicristallina all'interno di un polimero lineare non ramificato. (it)
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  • Der Begriff Sphärolith (von altgriechisch σφαῖρα sphaîra ‚Kugel‘ und altgriechisch λίθος líthos ‚Stein‘) bezeichnet allgemein ein kugeliges oder strahliges Kristallaggregat. In der Polymerphysik wird als Sphärolith eine für thermoplastische Kunststoffe typische kugelförmige Überstruktureinheit bezeichnet, in der Kristallite radialsymmetrisch angeordnet und über amorphe Zwischenbereiche fest verbunden sind. Die Größe und die Anzahl der Sphärolithe in einem Werkstück beeinflusst ganz wesentlich dessen mechanische und optische Eigenschaften. (de)
  • 高分子物理学において球晶(spherulites)とは、非分枝の直鎖状ポリマーによく見られる、球状の。溶融状態のポリマーを冷却することで生成する。球晶の形状は、ポリマーの分子構造、核となる物質の量、冷却速度など、多くの要素の影響を受ける。球晶の大きさは条件で大きく異なり、数μmから数mmになることもある。球晶自体はポリマーの規則的な配列()から成るため高密度で丈夫である。球晶同士は、アモルファス(球晶にならなかった)状態のポリマーで結合されている。ただし球晶同士の結合力は小さいため、大きな球晶を数多く含む材料は脆い場合が多い。球晶は、その中心からラメラ構造が放射状に広がっているため、ラメラの持つ複屈折の性質により、 光学顕微鏡で観察すると十字状の模様がみられる。 (ja)
  • La sferulite è una regione semicristallina all'interno di un polimero lineare non ramificato. (it)
  • In polymer physics, spherulites (from Greek sphaira = ball and lithos = stone) are spherical semicrystalline regions inside non-branched linear polymers. Their formation is associated with crystallization of polymers from the melt and is controlled by several parameters such as the number of nucleation sites, structure of the polymer molecules, cooling rate, etc. Depending on those parameters, spherulite diameter may vary in a wide range from a few micrometers to millimeters. Spherulites are composed of highly ordered lamellae, which result in higher density, hardness, but also brittleness when compared to disordered regions in a polymer. The lamellae are connected by amorphous regions which provide elasticity and impact resistance. Alignment of the polymer molecules within the lamellae re (en)
rdfs:label
  • Sphärolith (de)
  • Sferulite (it)
  • 球晶 (ja)
  • Spherulite (polymer physics) (en)
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