Perforated shim stock technique

Poly(cyclohexyl methaciylate) has been recently examined by Dynamic Mechanical Analysis (DMA) via the perforated shim stock technique by Keinath and Boyer. Taking into account the frequency shift, the temperature of the loss peaks (115 C for the Tg and 158"C for die T ) are in good agreement widi the TSC data. We note that for this peculiar material, the relative magnitude of the peaks are the same in DMA and TSC. 

Thermal methods include differential scaiming calorimetry, thermomechanical analysis, hot stage microscopy, and a new technique referred to as "photo DSC." Two dynamic mechanical analysis techniques have been developed, the first employing a perforated shim stock support, and the second utilizing polymer blend encapsulation. 

Photo DSC refers to a new technique applied to the observation of macroscopic changes in sample physical dimensions, meanwhile recording a DSC scan of the material. Two dynamic mechanical analysis techniques have been developed to study liquid state relaxations. The first employs a perforated shim stock support upon which the sample to be studied is coated. An alternative support mechanism involves polymer blend encapsulatioiL Here, the polymer of interest is incorporated into a high-7, continuous-phase polymer matrix. Both techniques have been employed to examine the polymer liquid state to well over 100 C above Tg, and requite very small amounts of the polymer sample of interest... 

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