Dynamic mechanical spectroscopy testing

The first data on polymer systems were collected via (laser-) light-scattering techniques [1] and turbidity measurements, further developed by Derham et al. [2,3]. Techniques based on the glass-transition of the polymer-blend constituents were also tested, such as DSC, Dynamic Mechanical Spectroscopy, and Dielectric relaxation [4]. Films made from solutions of... 

Dynamic Mechanical Spectroscopy. Samples were run in the tensile mode using a Rheometrics Model 605 Mechanical Spectrometer. Temperature scans were run from -160 to 240 C using a strain of 0.15% and a frequency of 1 Hertz. Samples were maintained in a nitrogen atmosphere during testing. 

Dynamic Mechanical Spectroscopy. As pointed out above, the heterogeneous morphology, observed in the present study, implies network flaws (weak connections between the primary and secondary microgels). However, the low cyclic strains applied in dynamic mechanical tests detect only the effect of the basic network structure and not the network flaws. Therefore, as observed experimentally (, ) dynamic mechanical spectroscopy should not indicate heterogeneity in the samples. 

Huang, Y. Q., Jiang, S. L., Wu, L. B., and Hua, Y. Q. 2004. Characterization of LLDPE/nano-Si02 composites by solid-state dynamic mechanical spectroscopy. Polymer Testing 23 9-15. 

A Shitnadzu 1601 and a Caiy 5000 were employed for UV- fis and NIR spectroscopy, respectively. Mechanical tests were carried out using a dynamic mechanical analysis (DMA) instmment Q-800 (TA series) in strain rate mode to record the force -displacement data generated at constant temperature (10 mm gauge length, 0.5 mm/ min). 

Composition profiles generated by interdiffusion in the concentrated regime between polyphenylene oxide-polystyrene blend pairs were experimentally determined by two techniques. Three-point bending moment measurements over a convenient temperature range (dynamic mechanical analysis (DMA)) were used to determine interphase composition profiles. Confocal micro-Raman spectroscopy was also used to measure local compositions along a direction which was perpendicular to the original interface. The study included some limiting cases to test accuracy, precision and flexibility of the DMA method. 4 refs. 

The indirect methods for fiber-matrix adhesion-level measurement are shown in Fig. 2. These include the variable curvature method the slice compression test, the ball compression test, the fiber-bundle pull-out test the use of dynamical-mechanical thermal analysis and voltage-contrast X-ray photoelectron spectroscopy (VCXPS). 

---