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236839923

铁杆木虫 (正式写手)
on Friday, March 24th, 2023
A second approach for testing the possibility of mmr is <was>the isothermal crystallization for 20 min, followed by melting at different heating rates. The melting endotherms for heating rates of 2.5-100c/min were measured. The melting curves moved towards higher temperatures and broadened dramatically with the increasing heating rate. to rationalize these curves, we performed the the same rate studies with indium and HDPE-1. The indium was held briefly in the melt, cooled at -100c/min, melted at 2.5-100c/min, and the HDPE-1 was held briefly in the melt, cooled at 25c/min, melted at 2.5-100c/min.  The indium and HDPE-1 melting curves likewise moved towards the higher temperatures and broadened dramatically with the increasing temperature.
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十四万人齐解甲，竟无一个是男儿
151楼2023-03-24 07:45:33
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236839923

铁杆木虫 (正式写手)
on Saturday, March the 25th, 2023
The position of the peak maxima of these curves was found directly from the DSC endotherms for Indium and HDPE-1. For M-ULDPE, the DSC curves was peak-fit with a software package(peakfit , ) as shown for the 10c/min in Figure 19. The maxima of the three peak-fit curves for each heating rate were found for M-ULDPE from peak-fit curves, as shown, for example, in Figure 19. The shifting of the peak maxima for indium, HDPE-1, and  three peaks of M-ULDPE(determined by peak fitting) are plotted as a function of heating rate in Figure 20. It may be observed in Figure 20 that all the lines have reasonably similar slopes , indicating that the maxima of the three peaks of MULDPE and maxima of the  indium and HDPE-1 curves  move towards higher temperature at similar rate as a function of the heating rate.  This result confirms that the melting of isothermally crystallized M-LLDPE do not involve appreciable mrr but rather that the shifting of the melting peak maxima with the heating rate is simply due to thermal lag in DSC. Furthermore, the shifting of the peak maxima for MULDPE is the same as that observed for indium and HDPE-1, which certainly do not involve mrr.
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十四万人齐解甲，竟无一个是男儿
152楼2023-03-25 07:59:11
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236839923

铁杆木虫 (正式写手)
on Friday, March 31th, 2023
A third approach for testing the possibility of mrr was directly modeling the thermal lag due to heating-rate variation in DSC.  The similar approach of A and B was followed.  Our results were simliar to those of A and B, who concluded that these calculation were <are> only a good model of DSC thermal lag up to 20c/min. Therefore, these calucation were deemed unsuitable for investing the thermal lag up to 100c/min.
The overall conclustion of these studies was that mmr is not responsible for the multimodal  melting peak behavior of the random copolymers in this work, but instead htis behavior is due to mutiple crystal thickness populations.
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十四万人齐解甲，竟无一个是男儿
153楼2023-03-31 07:45:40
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236839923

铁杆木虫 (正式写手)
on Saturday, April 1st, 2023
Multiple melting endotherms
The results of this work indicate that multiple peaks in melting endotherms of compositionally homogeneous PE copolymers are due to intrachain heterogeniety. This intrachain heterogeneity was quantified by Flory's theory by way of eqs 1 and 2. This heterogeniety is due to the distribution of ethylene sequence lengths within the chain.  A primary crystallizaion produces a thicker lamella population, creating a network that places severe restrictions on the chain <segment>transport in subsequent secondary crystallization, which produces a thinner lamella population<population of a thinner crystals>. The thicker lamella population is formed by the longer ethylene sequence lengths in the intrachain sequence length distribution, whereas the thinner crystal population is formed by the shorter ethylene sequence lengths. The longer ehtylene sequence length crystallize first because they are more highly undercooled than the shorter sequences. The crystal populations are , therefore, formed by <from sequence of different lengths that are in the same polymer chains.>differenet length sequence in the same polymer chain. DSC melting endotherms, which are  typically bimodal, were observed after isothermal crystallization of such compositionally homogeneous copolymers.
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十四万人齐解甲，竟无一个是男儿
154楼2023-04-01 08:14:52
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