Crystalline areas are generally more densely packed than amorphous areas. This results in a higher density, up to 15% depending on the material. For example, polyamide 6 (nylon) has crystalline density ρ c = 1.24 g/cm 3 and amorphous density ρ a = 1.08 g/cm 3). However, moisture which is often present in … 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. Some polymers retain such a disordered structure upon freezing and readily convert into amorphous solids. In other polymers, … See more • Liquid crystal polymer • Modeling of polymer crystals See more The fraction of the ordered molecules in polymer is characterized by the degree of crystallinity, which typically ranges between 10% and … 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. … See more Geologists describe four qualitative levels of crystallinity: • holocrystalline rocks are completely crystalline; • hypocrystalline rocks are partially crystalline, with crystals embedded in an amorphous or glassy matrix; • hypohyaline rocks are partially glassy;
Starch: Structure, Properties, Chemistry, and Enzymology
http://www.uspbpep.com/ep60/2.9.33.%20characterisation%20of%20crystalline%20and%20partially%20crystalline%20solids%20by%20x-ray%20powder%20diffraction%20xrpd%2024933e.pdf WebThe melting curve of a partially crystalline polymer therefore contains information on the size distribution of the crystallites present in the material. If the melting enthalpy of a 100 percent crystalline material (∆Hf 100 %) is known, the crystallinity of a sample can be calculated from the area of the melting peak. originated by deutsch
Viscoelastic constitutive modeling of creep and stress relaxation …
Web6 Apr 2024 · In this study, partially delocalized Co–S–Se ultra-thin nanosheets are obtained via a liquid–liquid interface-mediated strategy at an oil–water interface. These Co–S–Se … Web19 Mar 2024 · Crystalline behavior of poly(L-lactic acid) (PLLA), polybutylene succinate (PBS) and their (PLLA/PBS) blends were investigated using differential scanning calorimetry, dynamic viscoelastic property, in situ simultaneous small-angle X-day scattering (SAXS)/wide-angle X-ray diffraction (WAXD) measurements, and scanning electron … WebBy heating to different degrees, the amount of fat crystals in the drops was able to be controlled, with progressively more compact partially-coalesced states, and eventually complete coalescence generated as the solid content was reduced. originated cells