Evaluation of postpolymerization as a function of the storage time of triethylene glycol dimethacrylate/2,2-bis[4-(2-hydroxy-3-methacryloxy-prop-1-oxy)-phenyl]propane bisphenyl-α-glycidyl ether dimethacrylate copolymers used in dental resins by differential scanning calorimetry and dynamic mechanical analysis

2009 ◽  
Vol 112 (2) ◽  
pp. 679-684 ◽  
Author(s):  
Isabel C. Rigoli ◽  
Carla C. S. Cavalheiro ◽  
Miguel G. Neumann
Keyword(s):  
Differential Scanning Calorimetry ◽  
Dynamic Mechanical Analysis ◽  
Storage Time ◽  
Glycidyl Ether ◽  
Triethylene Glycol ◽  
Mechanical Analysis ◽  
Glycol Dimethacrylate ◽  
Scanning Calorimetry ◽  
Triethylene Glycol Dimethacrylate ◽  
Dental Resins

Dynamic Mechanical and Crystallization Properties of PTT/EPDM-g-MA/OMMT Blends

2012 ◽  
Vol 466-467 ◽  
pp. 23-26
Author(s):  
Kun Yan Wang ◽  
Ying Ye ◽  
Xiao Qing Zhu ◽  
Feng Cao
Keyword(s):  
Differential Scanning Calorimetry ◽  
Melting Point ◽  
Maleic Anhydride ◽  
Dynamic Mechanical Analysis ◽  
Mechanical Analysis ◽  
Scanning Calorimetry ◽  
Ethylene Propylene ◽  
Dynamic Mechanical ◽  
Crystallization Properties ◽  
Trimethylene Terephthalate

The blends of poly(trimethylene terephthalate) (PTT) with ethylene-propylene-diene copolymer grafted with maleic anhydride (EPDM-g-MA) and organoclay(OMMT) were prepared by melt blending.The composites were characterized by dynamic mechanical analysis (DMA) and differential scanning calorimetry (DSC). The results suggest that the PTT is immiscible with EPDM-g-MA when OMMT was added to the blends. Strorage modulus of the PTT/EPDM-g-MA/OMMT are higher than those of pure PTT. The melting point of pure PTT and blends was almost constant. The crystallinity of the blends with OMMT were higher than that of pure PTT.

scholarly journals Pharmaceutical Amorphous Organic Materials Characterization by Using the Differential Scanning Calorimetry and Dynamic Mechanical Analysis

2011 ◽  
Vol 6 (2) ◽  
pp. 91-95
Author(s):  
Ion Dranca ◽  
Igor Povar ◽  
Tudor Lupascu
Keyword(s):  
Differential Scanning Calorimetry ◽  
Glass Transition ◽  
Transition Temperature ◽  
Glass Transition Temperature ◽  
Dynamic Mechanical Analysis ◽  
Mechanical Analysis ◽  
Relaxation Processes ◽  
Scanning Calorimetry ◽  
Dynamic Mechanical ◽  
Β Relaxation

This research has been carried out in order to demonstrate the use of differential scanning calorimetry (DSC) in detecting and measuring α- and β-relaxation processes in amorphous pharmaceutical systems. DSC has been employed to study amorphous samples of poly (vinylpyrrolidone) (PVP), indomethacin (InM), and ursodeoxycholic acid (UDA) that are annealed at temperature (Ta) around 0.8 of their glass transition temperature (Tg). Dynamic mechanical analysis (DMA) is used to measure β- relaxation in PVP. Yet, the DSC has been used to study the glassy indomethacin aged at 0 and -10 oC for periods of time up to 109 and 210 days respectively. The results demonstrate the emergence of a small melting peak of the α-polymorph after aging for 69 days at 0°C and for 147 days at -10°C (i.e., ~55°C below the glass transition temperature) that provides evidence of nucleation occurring in the temperature region of the β-relaxation.

Study on the Mechanism of the Soybean Adhesive Improved by Micro/Nano Fibrils and the Bond Strength of the Poplar Plywood with it

2012 ◽  
Vol 174-177 ◽  
pp. 1152-1158
Author(s):  
Cong Liu ◽  
Yang Zhang ◽  
Wen Ding Li
Keyword(s):  
Differential Scanning Calorimetry ◽  
Bond Strength ◽  
Heat Resistance ◽  
Dynamic Mechanical Analysis ◽  
Bonding Strength ◽  
Mechanical Analysis ◽  
Scanning Calorimetry ◽  
Dynamic Mechanical

The micro/nano fibrils was used to modify the soybean glue, which was used as the adhesive of poplar plywood. The poplar plywood bond strength were evaluated. To explain the improvement in mechanism, Differential Scanning Calorimetry(DSC) and Dynamic Mechanical Analysis apparatus(DMA) were applied to analyze the influence of poplar macro/nano fibrils on soybean glue. The test of bonding strength results show that the bond strength of poplar plywood was enhanced as micro/nano poplar fibrils was added. And the DMA figures of soybean glue illustrate that poplar macro/nano fibrils has improved the deformation resistence of soybean glue plywood and the heat resistance of soybean glue.

Effect of composition on the properties of PMMAPTEGDMA shrinkage-controlled copolymers

e-Polymers ◽  
2003 ◽  
Vol 3 (1) ◽  
Author(s):  
Rodrigo Velázquez ◽  
Julio Reyes ◽  
Victor M. Castaño
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Methyl Methacrylate ◽  
Triethylene Glycol ◽  
Glycol Dimethacrylate ◽  
Scanning Calorimetry ◽  
Triethylene Glycol Dimethacrylate ◽  
Micro Raman Spectroscopy ◽  
Acrylic Copolymers ◽  
Scanning Electron

Abstract Acrylic copolymers made of a casting syrup (prepared from poly(methyl methacrylate) (PMMA) dissolved in methyl methacrylate) and triethylene glycol dimethacrylate (TEGDMA) were synthesized by promoting the decomposition of benzoyl peroxide (BP) with dimethyl-p-toluidine. In addition, conventional copolymers, made of methyl methacrylate and triethylene glycol dimethacrylate monomers, were synthesized via thermal decomposition of BP. The two types of reaction were carried out as bulk polymerizations. Both types of copolymers were studied applying scanning electron microscopy, IR and micro-Raman spectroscopy, differential scanning calorimetry, and dilatometry. It was found that the conventional polymer is a MMA-TEGDMA copolymer without phase separation, while the phase-separated polymer contains microdomains. The shrinkage of the polymers, as well as their morphology, can be easily controlled through the chemical composition.

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