Topic
Differential scanning calorimetry
About: Differential scanning calorimetry is a research topic. Over the lifetime, 50315 publications have been published within this topic receiving 1152335 citations. The topic is also known as: DSC.
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TL;DR: It was found that each polymer was able to significantly decrease the nucleation rate of amorphous felodipine even at low concentrations (3-25% w/w), and hydrogen bonding interactions were formed between felodIPine and each of the polymers.
387 citations
TL;DR: In this article, the results of detailed investigations of powders and thin films of deuterated poly(3-hexylthiophene) (P3HT) fractions with different molecular weight were presented.
Abstract: Recently, two different groups have reported independently that the mobility of field-effect transistors made from regioregular poly(3-hexylthiophene) (P3HT) increases strongly with molecular weight. Two different models were presented: one proposing carrier trapping at grain boundaries and the second putting emphasis on the conformation and packing of the polymer chains in the thin layers for different molecular weights. Here, we present the results of detailed investigations of powders and thin films of deuterated P3HT fractions with different molecular weight. For powder samples, gel permeation chromatography (GPC), differential scanning calorimetry (DSC), and X-ray diffraction (XRD) were used to investigate the structure and crystallization behavior of the polymers. The GPC investigations show that all weight fractions possess a rather broad molecular weight distribution. DSC measurements reveal a strong decrease of the crystallization temperature and, most important, a significant decrease of the de...
384 citations
TL;DR: In this article, a rigid cellulosic network within a poly(oxyethylene) matrix and a stable aqueous suspension of cellulose nanocrystals extracted from tunicate as the reinforcing phase were obtained by casting and evaporating the preparations, using scanning electron microscopy, differential scanning calorimetry, thermogravimetric analysis and dynamic mechanical analysis.
382 citations
TL;DR: It was found that the glass-rubber transition temperature of the plasticized amylopectin matrix first increases up a whiskers content around 10-15 wt % and then decreases, and a significant increase in crystallinity was observed in the composites by increasing either moisture content or whisker content.
381 citations
TL;DR: In this article, isotactic polypropylene (PP) was zone-solidified in temperature gradients up to 300°C/cm at growth rates down to 3 μm/min.
Abstract: Samples of isotactic polypropylene (PP) were zone-solidified in temperature gradients up to 300°C/cm at growth rates down to 3 μm/min. Oriented α-type spherulites were obtained only by nucleation. While β nucleation is extremely rare, the β phase is easily initiated by growth transformations along the oriented α front. Since the β phase was found to grow considerably faster than the α phase, the α-to-β transformation points diverge across the sample, interrupting growth of the oriented α fibrils. This causes subsequent nucleation to yield teardrop-shaped α spherulites.
Differential scanning calorimetry (DSC) studies of zone-solidified PP show the β-phase to be favored by slow growth rates, high temperature gradients, and large degrees of superheat in the melt—all of which tend to suppress nucleation. Differential thermograms of largely β-PP obtained at a heating rate of 1°C/min show the actual melting and recrystallization of the β spherulites into the α form.
378 citations