WebJun 4, 2024 · พอลิเมอร์ (Polymer) คือ สารประกอบที่มีโมเลกุลขนาดใหญ่ และมีมวลโมเลกุลมากประกอบด้วย หน่วยเล็ก ๆ ของสารที่อาจจะเหมือนกันหรือต่างกันมาเชื่อมต่อ ... Crystalline polymers are usually opaque because of light scattering on the numerous boundaries between the crystalline and amorphous regions. The density of such boundaries is lower in polymers with very low crystallinity (amorphous polymer) or very high degree of crystalline polymers, … See more Crystallization of polymers is a process associated with partial alignment of their molecular chains. These chains fold together and form ordered regions called lamellae, which compose larger spheroidal structures named See more Solidification from the melt Polymers are composed of long molecular chains which form irregular, entangled coils in the melt. … See more Thermal and mechanical properties Below their glass transition temperature, amorphous polymers are usually hard and brittle because of the low mobility of their molecules. Increasing the temperature induces molecular motion resulting in the typical rubber … See more The fraction of the ordered molecules in polymer is characterized by the degree of crystallinity, which typically ranges between 10% and 80%. Higher values are only achieved in materials having small molecules, which are usually brittle, or in samples stored for … See more • Liquid crystal polymer • Modeling of polymer crystals See more

4.5: Crystallinity in Polymers - Chemistry LibreTexts

WebThe device, made from a stiff, crystalline polymer, can be implanted in a patient's tumor using a biopsy needle. Implantable device for advance testing. POM is a highly … WebSep 12, 2024 · Polymers are different from many other such solids. Metals, for instance, have crystalline structures, in which atoms form a regularly repeating pattern, row upon … fishing 13 concept kp fishing reel on sale

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WebPolyvinylidene fluoride (PVDF) is a semi-crystalline thermoplastic fluoropolymer. It is readily melt-processible and can be fabricated into parts by injection and compression molding. It combines high mechanical strength with good processability. PVDF is commonly employed in chemical processing equipment such as pumps, valves, pipes, tubes and ... WebPolymorphism (materials science) In materials science, polymorphism describes the existence of a solid material in more than one form or crystal structure. Polymorphism is a form of isomerism. Any crystalline material can exhibit the phenomenon. Allotropy refers to polymorphism for chemical elements. http://pws.npru.ac.th/arunrat/data/files/%E0%B8%9E%E0%B8%AD%E0%B8%A5%E0%B8%B4%E0%B9%80%E0%B8%A1%E0%B8%AD%E0%B8%A3%E0%B9%8C.pdf fishing 1-300 classic wow