Differential scanning calorimetric (DSC) measurements of composite fibers were obtained in N2 atmosphere at a ramp rate of 10 °C/min to 100 °C using DSC instrument (DSC Q 2000, TA Instruments, Inc., DE). Neat-PCL and composites (1%, 5%, and 10%) of PCL/HA were weighed (15 mg) in aluminum pans, scanned under the aforementioned parameter in a Q2000 DSC (TA instruments).
Dsc q2000
Manufactured by TA Instruments
Sourced in United States, United Kingdom, Belgium
The DSC Q2000 is a differential scanning calorimeter (DSC) designed for thermal analysis. It measures the heat flow associated with phase transitions and chemical reactions in materials as a function of temperature and time. The DSC Q2000 provides precise measurements of specific heat capacity, glass transition, melting, and crystallization behavior of a wide range of materials.
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Lab products found in correlation
Universal analysis 2000, by TA Instruments (37 mentions)
Tga q500, by TA Instruments (9 mentions)
Discovery tga, by TA Instruments (9 mentions)
Ta advantage software for q series, by TA Instruments (9 mentions)
Tga q5000, by TA Instruments (8 mentions)
Trios software, by TA Instruments (8 mentions)
Ta universal analysis 2000, by TA Instruments (6 mentions)
Ta universal analysis software, by TA Instruments (6 mentions)
Tzero pan, by TA Instruments (5 mentions)
Aluminum pans, by Hitachi (4 mentions)
Aluminum pan, by PerkinElmer (4 mentions)
Pyris 1 tga, by PerkinElmer (3 mentions)
Ta universal analysis software v 4.5a, by TA Instruments (3 mentions)
Rcs90, by TA Instruments (3 mentions)
Sdt q600, by TA Instruments (3 mentions)
Axio observer a1, by Zeiss (3 mentions)
Aluminum hermetic pans, by TA Instruments (2 mentions)
Griseofulvin, by Merck Group (2 mentions)
Griseofulvin, by TA Instruments (2 mentions)
Xp26 microbalance, by Mettler Toledo (2 mentions)
372 protocols using dsc q2000
1
Thermal Analysis of PCL/HA Composites
2
Lyophilization of Solid Samples: Protocols and Analysis
3
Phytoglycogen-Ibuprofen Complex Formation
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Example 6
To prepare phytoglycogen-ibuprofen complex, ibuprofen, phytoglycogen and DMSO were mixed in a ratio of 1:3:6 or 1:5:10 by weight. The resulting pastes were placed in vacuum to remove DMSO and the collected solids were ground into powder. Meanwhile, ibuprofen was treated using DMSO in a similar manner (dissolving in DMSO followed by solvent removal) and the solid collected was used in preparing several control samples. Dry mixes of phytoglycogen and original or DMSO-treated ibuprofen were prepared. These materials were used for DSC and X-ray powder diffraction analysis.
For DSC analysis, each solid were weighted and sealed into PerkinElmer aluminum-hermetic pans and subjected to DSC Q2000 (TA Instruments) with scanning rate of 20° C./min over 0 to 250° C. Each DSC curve was normalized using the weight of ibuprofen. For X-ray powder diffraction analysis. Solid powders were weighted and analyzed using Shimadzu XRD-6000 X-ray powder diffractometer equipped with a Bragg-Brentano optical setup. Samples were scanned with a step size of 0.08° from 5 to 40° 2θ. The DSC and X-ray diffraction analysis results are shown in
4
Griseofulvin Complexation with PG-S and PG-S-PEG for Amorphous Stability
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Example 5
Griseofulvin (Sigma-Aldrich) 0.55 grams, 1.65 grams PG-S or PG-S-PEG and 6.05 grams of DMSO were mixed using mortar and pestle. The mixture was transferred to glass vials and vacuum dried to completely remove DMSO. As control, Griseofulvin was dissolved in DMSO in the same ratio as that for the complexation and subjected to vacuum drying to collect Griseofulvin solid. In addition, physical mixtures of Griseofulvin and PG-S or PG-S-PEG were prepared at a ratio of 1/3 as controls.
After 37 days at 22° C., differential scanning calorimetry (DSC) analysis was conducted for samples of Griseofulvin complexed with PG-S and PG-S-PEG with several controls. For DSC analysis, materials (3-7 mg) were weighed and sealed in PerkinElmer aluminum-hermetic pans. DSC tests were conducted using DSC Q2000 (TA Instruments) with scanning rate of 20° C./min over 20-250° C. Heat flow (W/g) for each sample was normalized according to the content of Griseofulvin for each sample. The results are shown in
5
Thermal Analysis of Epoxy Curing
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TMDSC analysis was employed for monitoring the efficiency of the curing protocol used in the preparation of the neat epoxy system and epoxy nanocomposites and was conducted by using a TA Instruments DSC Q2000 equipment (TA Instruments Inc., New Castle, DE, USA) under helium flow (25 mL/min), with the underlying rate of 10 °C/min, amplitude of 0.8 °C/min, and a period of 30 s as follows: equilibrating at −85 °C; isothermal for 5 min; heating from −85 °C to 305 °C.
6
Thermal Properties of PolySMA Xerogels
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The thermal properties of polySMA xerogels were studied by differential scanning calorimetry (DSC) using a DSC Q2000 (TA Instruments, Inc., New Castle, DE, USA). The measurements were performed in the temperature range from −70 to 200 °C at a heating rate of 10 °C·min−1 in nitrogen (flow rate 50 cm3·min−1). The glass transition temperatures (Tg) were determined from the second heating scans.
The thermal stability was examined by thermogravimetric analysis (TGA) using a thermogravimeter Pyris 1 TGA (Perkin Elmer, Inc., Waltham, MA, USA) in the temperature range from 30 to 650 °C at a heating rate 10 °C·min−1 under a nitrogen flow 25 cm3·min−1.
The thermal stability was examined by thermogravimetric analysis (TGA) using a thermogravimeter Pyris 1 TGA (Perkin Elmer, Inc., Waltham, MA, USA) in the temperature range from 30 to 650 °C at a heating rate 10 °C·min−1 under a nitrogen flow 25 cm3·min−1.
7
Characterizing Polymer Crystallinity via DSC
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Differential scanning calorimetry (DSC) scans were performed on similar samples as for the GPC study. The DSC analyses were carried out with a DSC Q2000 from TA Instruments®, New Castle, DE, USA. Enthalpy and temperature calibrations were performed using an indium standard. Around 5–10 mg of samples were sealed in Tzero pan and heated from −80 °C to 200 °C at 10 °C/min under nitrogen atmosphere. The characteristic temperatures such as the glass transition temperature (Tg), cold crystallization temperature (Tcc), and melting temperature (Tm) were collected to observe the variations of these features with the amount of HA and the processing steps.
The degree of crystallinity was determined following Equation (2):
where is the melting enthalpy, is the enthalpy of cold crystallization, is the weight fraction of HA particles, and , the melting enthalpy of the 100% crystalline polymer (i.e., 93.7 J/g for PLA) [43 (link)]. Three samples were tested for each condition.
The degree of crystallinity was determined following Equation (2):
where is the melting enthalpy, is the enthalpy of cold crystallization, is the weight fraction of HA particles, and , the melting enthalpy of the 100% crystalline polymer (i.e., 93.7 J/g for PLA) [43 (link)]. Three samples were tested for each condition.
8
Synthesis and Characterization of PLHMGA
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Poly(D,L-lactic-co-hydroxymethyl glycolic acid) (PLHMGA) was synthesized as previously described by Leemhuis et al. [27] . In this study, a molar ratio of 35% BMMG (3S-(benzyloxymethyl)-6Smethyl-1,4-dioxane-2,5-dione) and 65% D,L-lactide (mol/mol) was used, with butanediol as an initiator (1:300 mol/mol monomer) and tin (II) 2-ethylhexanoate as a catalyst (1:600 mol/mol monomer). Molecular weight of PLHMGA was determined by GPC (Waters Alliance System) using a Waters 2695 separating module and a Waters 2414 refractive index detector, operating with tetrahydrofuran at a flow rate of 1 mL/min, and calibrated with polystyrene standards (PS-2, M w = 580-377,400 D, EasiCal, Varian). Two PL-gel 5 lm Mixed-D columns fitted with a guard column were used. The copolymer composition was determined with NMR (Gemini-300 MHz) analysis, using chloroform-d, 99.8 atom% (Sigma-Aldrich) as solvent. The thermal properties of the copolymer were measured with differential scanning calorimetry (DSC -Q 2000, TA Instruments). For DSC measurements, approximately 5 mg of the copolymer was placed in aluminum pan (T zero pan/lid set, TA Instruments) and the sample was scanned with a modulated heating method in three cycles [20] . The sample was heated until 120 °C (5 °C/min) and then cooled down to À50 °C, followed by a heating until 120 °C (5 °C/min). The temperature modulation was ±1 °C/min.
9
Differential Scanning Calorimetry Analysis of Cycloxibutin in Excipients
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DSC was performed on a DSC Q2000 instrument (TA Instruments, New Castle, DE, USA) on MMC and Neusilin before and after incorporation of drug. Crystalline CXB was also studied by DSC. Samples of 2.1–4.3 mg were weighed into 5 mm aluminum pans and sealed. The samples were first cooled to −35 °C and then heated to 200 °C at a heating rate of 10 °C min−1. The instrument was calibrated for the melting point and melting enthalpy of indium (156.6 °C and 28.4 J g−1, respectively). The heat flow was normalized against the amount of CXB in the samples, and the melting enthalpy for crystalline CXB was obtained by integration of the endothermic peak at around 164 °C. The degree of CXB crystallinity in the samples was calculated by comparing the melting enthalpy for free and loaded CXB in the carrier particles.
10
Thermal Analysis of Polymer Samples
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Differential scanning calorimetry (DSC) analysis was performed using a DSC Q2000 (TA Instruments, Inc., New Castle, DE, USA) under helium flow (25 mL/min), according to the Manufacturer instructions. Samples weighing around 10 mg were packed in aluminum pans, and MDSC analysis was carried out to determine the thermodynamic parameters (transition temperature—Tg, specific heat capacity—ΔCp, enthalpy—ΔH) and the glass transition.
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