The conservation equations for mass, momentum, and energy were applied to the molten layer and then simplified by an order of magnitude analysis. A general model that included all significant terms gave rates of melting that agreed closely with the measured rates. A simpler model that was ...
Crystalline oriented filaments of a polyamide consisting primarily of the following recurring structural units wherein n is 9-14, preferably 10, at least 70% by weight of the diamino constituent of the repeating units being of a trans-trans stereoisomeric configuration, and the filaments having a ...
[20]. Each type of polymer crystal has a specific order and melting temperature in accordance with the entropy of the conformation of the chain folding[21,22], which is not the case for small molecules that have a precise melting point (no chain folding effect)[23]. In small molecules, ...
The melting and crystallization characteristics were determined by differential scanning calorimetry (DSC). The results indicate clearly that iPP with low molecular mass crystallizes essentially in #945;-modification. However, it crystallizes in #946;-form in the presence of a highly efficient and ...
The enthalpy for the melting of crystalline domains per unit mass of the dried sample Hcrystalline was obtained from the integration of the narrow peak. The mass of the residual water mresidual was calculated as: $${m}_{{{\rm{residual}}}=m\times \frac{{H}_{{{\rm{residual}}}{{H}...
62The term liquid crystal originates from the fact that the crystalstructure of the polymer is partly maintained in the liquid phase above the melting point (Fig. 7.37). This is because the polymer consists of ordered, rigid rods, or mesogens either along the polymer backbone or on the ...
An amorphous sample with a size of 3.17 × 3.18 × 3.15 nm3 was generated by melting the crystal sample at 5,000 °C for 100 ps and then quenching to 25 °C at a cooling rate of 1 °C ps−1. A hypocrystalline sample with a size of 2.81 × 3...
The lower melting points and the appearance of the glass-transition points in 3a and 3b suggest that these species exhibit low crystallinity, which promotes the formation of transparent films. The enthalpies corre- sponding to the melting points significantly decrease with the length of the ...
Property of the materialOptimal value (High/low)Performance of the PCM The melting point L Low melting point materials will require a lower reset current Temperature of crystallization H Improved retention of data Conductivity of thermal energy L Reduced switching currents and improved heat confinement...
The high molecular weight grade is formed by solid-state polymerizing the low molecular weight polymer until the desired molecular weight (e.g., melting temperature and melt viscosity) are achieved. [0057] Three (3) pellet samples are formed from the LCP polymers as follows: Sample 1 (low...