Rheological and Spectroscopic Characterizations of the Properties of a Prepolymer for High-Temperature Applications: The IP960 System

1996 ◽  
Vol 8 (3) ◽  
pp. 407-426 ◽  
Author(s):  
J P Habas ◽  
M F Grenier-Loustalot ◽  
J Peyrelasse
Keyword(s):  
Differential Scanning Calorimetry ◽  
Glass Transition ◽  
High Temperature ◽  
Polymer Network ◽  
Thermomechanical Analysis ◽  
Reference Compound ◽  
Scanning Calorimetry ◽  
H Nmr ◽  
Combined Use ◽  
Two Peaks

Of the thermostable polymers on the market the American PMR-15 resin is a reference compound. Nevertheless, its defects have necessitated the development of new polymers such as IP960. The object of this work is to characterize IP960 which is soluble in the diglyme until the imide oligomer stage. HPLC and 1H NMR analyses of the prepolymer demonstrate its polymolecularity. Several isomer forms, due to possible conformations of the nadimide endcaps, are present in equal amounts in the medium. The combined use of differential scanning calorimetry and rheological techniques have allowed us to study and to explain the evolution of properties of the prepolymer with temperature (glass transition, crosslinking etc). Using FTIR spectroscopy, we have studied the structure of the polymer network. Our results seem to confirm the validity of the crosslinking diagram of nadic structures proposed by Wong and co-workers. Thermomechanical analysis of the crosslinked compound shows that the Tg of the polymer is close to 292 °C. It also reveals on the curb of the modulus G″, namely the presence of two peaks γ and β associated with secondary mechanical relaxations within macromolecular chains ( Tγ = −102 °C; Tβ =68 °C).

Study of Application of Thermal Infrared Camouflage Materials in the National Defense Engineering

2014 ◽  
Vol 651-653 ◽  
pp. 107-110
Author(s):  
Nai Yan Zhang ◽  
Jun Liu
Keyword(s):  
Differential Scanning Calorimetry ◽  
Glass Transition ◽  
Room Temperature ◽  
Polymer Network ◽  
Thermal Infrared ◽  
Interpenetrating Polymer Network ◽  
National Defense ◽  
Scanning Calorimetry ◽  
Response To Temperature ◽  
Infrared Camouflage

In this paper, a series of semi-interpenetrating polymer network materials based on poly ((2-dimethylamino) ethyl methacrylate)/poly (N, N-diethylacrylamide) (PDMAEMA/PDEA) were synthesized at room temperature. The influence of this additive on the property of resulting PDEA materials was investigated and characterized. The glass transition temperature (Tg) of the semi-IPN materials was observed by Differential Scanning Calorimetry (DSC). Compared to PDEA, the semi-IPN materials exhibited excellent mutative values in response to an alternation of the temperature, and showed fast swelling and deswelling rates in response to temperature change, which suggests that these materials have potential application as thermal infrared camouflage materials.

Crystallization of Bulk Zr48Nb8Cu14Ni12Be18Metallic Glass

2000 ◽  
Vol 644 ◽  
Author(s):  
Y.X. Zhuang ◽  
L. Gerward ◽  
J.Z. Jiang ◽  
J.S. Olsen ◽  
Y. Zhang ◽  
...  
Keyword(s):  
Differential Scanning Calorimetry ◽  
High Pressure ◽  
Glass Transition ◽  
High Temperature ◽  
Synchrotron Radiation ◽  
Powder Diffraction ◽  
Applied Pressure ◽  
Scanning Calorimetry ◽  
X Ray

AbstractThe crystallization of bulk Zr48Nb8Cu14Ni12Be18metallic glass has been investigated by differential scanning calorimetry (DSC) and X-ray powder diffraction. The activation energies of glass transition and crystallization for the glass obtained using Kissinger analysis from the shift of the peak temperature in the DSC curve are 470 and 235 kJ/mol, respectively. The effect of applied pressure on crystallization is studied by in situ high-pressure and high-temperature X-ray powder diffraction using synchrotron radiation. It is found that the crystallization temperature increases with pressure having a slope of 9.5 K/GPa in the range of 0-4.4 GPa.

Synthesis and characterization of 4-chloromethylstyrene polymers containing bulky organosilicon groups

e-Polymers ◽  
2004 ◽  
Vol 4 (1) ◽  
Author(s):  
Kazem Dindar Safa ◽  
Mirzaagha Babazadeh
Keyword(s):  
Differential Scanning Calorimetry ◽  
Glass Transition ◽  
Gel Permeation Chromatography ◽  
Synthesis And Characterization ◽  
Scanning Calorimetry ◽  
H Nmr ◽  
Gel Permeation ◽  
Covalently Linked ◽  
C Nmr

Abstract The homopolymer of 4-chloromethylstyrene and its copolymers with styrene (in 1:3 and 1:1 mole ratio) were synthesized by bulk and solution freeradical polymerisations, respectively, at 70±1°C using α,α'-azoisobutyronitrile as an initiator. Highly sterically hindered tris(trimethylsilyl)methyl (Tsi) substituents were then covalently linked to the obtained homopolymer and copolymers. The polymers were characterized by IR, 1H NMR and 13C NMR, differential scanning calorimetry (DSC) and gel permeation chromatography. DSC showed that incorporation of Tsi substituents in the side chains of homopolymer and copolymers increases the rigidity of the polymers and, subsequently, their glass transition temperature.

Evaluation of glass transition in model cell lines using differential scanning calorimetry

Cytotherapy ◽  
2021 ◽  
Vol 23 (5) ◽  
pp. S173
Author(s):  
C. Jones ◽  
J. Heimfeld ◽  
B.J. Hawkins ◽  
R. Marcu
Keyword(s):  
Differential Scanning Calorimetry ◽  
Glass Transition ◽  
Cell Lines ◽  
Scanning Calorimetry ◽  
Model Cell

scholarly journals Thermal analysis: basic concept of differential scanning calorimetry and thermogravimetry for beginners

2020 ◽  
Vol 0 (0) ◽  
Author(s):  
Nurul Fatahah Asyqin Zainal ◽  
Jean Marc Saiter ◽  
Suhaila Idayu Abdul Halim ◽  
Romain Lucas ◽  
Chin Han Chan
Keyword(s):  
Thermal Analysis ◽  
Differential Scanning Calorimetry ◽  
Glass Transition ◽  
Transition Temperature ◽  
Glass Transition Temperature ◽  
Commercial Application ◽  
Scanning Calorimetry ◽  
Teaching Activities ◽  
Sample Decomposition ◽  
Calibration Baseline

AbstractWe present an overview for the basic fundamental of thermal analysis, which is applicable for educational purposes, especially for lecturers at the universities, who may refer to the articles as the references to “teach” or to “lecture” to final year project students or young researchers who are working on their postgraduate projects. Description of basic instrumentation [i.e. differential scanning calorimetry (DSC) and thermogravimetry (TGA)] covers from what we should know about the instrument, calibration, baseline and samples’ signal. We also provide the step-by-step guides for the estimation of the glass transition temperature after DSC as well as examples and exercises are included, which are applicable for teaching activities. Glass transition temperature is an important property for commercial application of a polymeric material, e.g. packaging, automotive, etc. TGA is also highlighted where the analysis gives important thermal degradation information of a material to avoid sample decomposition during the DSC measurement. The step-by-step guides of the estimation of the activation energy after TGA based on Hoffman’s Arrhenius-like relationship are also provided.

scholarly journals Films Based on a Blend of PVC with Copolymer of 3-Hydroxybutyrate with 3-Hydroxyhexanoate

Polymers ◽  
2020 ◽  
Vol 12 (2) ◽  
pp. 270
Author(s):  
Evgeniy V. Belukhichev ◽  
Vera E. Sitnikova ◽  
Evgenia O. Samuylova ◽  
Mayya V. Uspenskaya ◽  
Daria M. Martynova
Keyword(s):  
Thermal Analysis ◽  
Differential Scanning Calorimetry ◽  
Environmental Pollution ◽  
Polyvinyl Chloride ◽  
Polymer Films ◽  
Thermomechanical Analysis ◽  
Packaging Materials ◽  
Packaging Film ◽  
Scanning Calorimetry ◽  
Environmental Friendliness

Polymeric packaging materials are one of the factors of environmental pollution. Reducing the environmental burden is possible by increasing the environmental friendliness of packaging materials. In this work, we study polymer films based on polyvinyl chloride (PVC) with a copolymer of 3-hydroxybutyrate with 3-hydroxyhexanoate P (3-GB) (3-GG) with different component ratios. The process of processing blends in the process of obtaining a packaging film is considered. The optical characteristics of the obtained films are determined. Thermal analysis of the obtained films was carried out using the differential scanning calorimetry (DSC), TGA, and thermomechanical analysis (TMA) methods. The degree of gelling of the resulting mixture was determined. It is shown that PHB has miscibility with PVC.

Probing of the combined effect of bisquaternary ammonium antimicrobial agents and acetylsalicylic acid on model phospholipid membranes: differential scanning calorimetry and mass spectrometry studies

2014 ◽  
Vol 10 (12) ◽  
pp. 3155-3162 ◽  
Author(s):  
N. A. Kasian ◽  
V. A. Pashynska ◽  
O. V. Vashchenko ◽  
A. O. Krasnikova ◽  
A. Gömöry ◽  
...  
Keyword(s):  
Mass Spectrometry ◽  
Differential Scanning Calorimetry ◽  
Acetylsalicylic Acid ◽  
Antimicrobial Agents ◽  
Combined Effect ◽  
Phospholipid Membranes ◽  
Scanning Calorimetry ◽  
Combined Use ◽  
The Individual

Qualitatively different membranotropic effects of the individual drugs and complexes formed in their combined use were demonstrated by differential scanning calorimetry.

Sign in / Sign up

Export Citation Format

Share Document