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The tan d values of these materials are approximately 01, 004, 002, and 001, respectively 27222 Thermal Properties The important thermal properties of a laminate are the glass transition temperature, the coefficient of thermal expansion, the time to delamination, and the decomposition temperature1,2,3 These properties quantify the material s reactions to extreme temperatures and so are indicator s of the materials suitability for a particular reflow profile and residual capacity for withstanding heat input (such as rework or hot use environments) Tg alone is insufficient to predict a materials response to LFA temperatures In fact, since each test measures a different response to temperature, all the tests together provide a broad determination of suitability to a particular use 272221 Glass Transition Temperature (Tg ).

The Tg of a resin is the temperature at which the resin reversibly changes from a glassy state to a rubbery state This loss of modulus creates an effective limit on the operating temperature of the system Tg also affects the thermal fatigue life of the plated holes in the ML-PWB Higher values of Tg translate into lower total z-axis expansion, which in turn means less stress on the plated through holes (PTHs), all other variables being held constant There are three methods that are currently used to evaluate Tg: differential scanning calorimetry (DSC), thermomechanical analysis (TMA), and dynamic mechanical analysis (DMA) Results from the three methods vary since they measure different properties associated with the glass transition Each has its rationale, strengths, and weaknesses.

Moore vacuum chuck [5]

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It is important to note not only the value of Tg given for a particular material, but the method by which the Tg was determined; only then can meaningful comparisons between materials be made Tg measurement by differential scanning calorimetry (DSC) defines the Tg as a change in the heat capacity of the material The deflection in the heat rate absorption curve, W/g/ C, is used to identify the second-order thermodynamic change from a glassy solid to an amorphous solid that is the glass transition DSC is the method most commonly used by laminators for determining, and reporting, the Tg The sample for DSC weighs between 15 to 25 mg and is tested with copper foil on both sides This method is well suited to the testing of laminates and provides a precision measure for Tg on cores and cured prepreg (laminated to foils) for the laminator.

These results are used for product acceptance and process control DSC results are generally 5 to 10 C higher than when the test is conducted by TMA..

Tg measurement by thermomechanical analysis (TMA) determines the Tg by the change in thermal expansion as the polymer goes from glass state to rubbery state due to a change in free molecular volume A change in the slope of the z-axis expansion rate indicates the glass transitionTypically, the data sheet will report the Tg and the CTE (discussed in more detail later in the chapter) in the z-axis above and below the Tg ( % CTE < Tg and a % CTE > Tg ), where the slope (viewed when graphed with temperature on the x-axis and percentage expansion on the yaxis) is much steeper above the glass transition Alternately or additionally, the data sheet may report the percent thermal expansion (PTE), which is the total change in thickness over a temperature range of interest for instance, from a temperature below Tg to the anticipated soldering temperature (eg.

, 245 C, 260 C) IPC-4101B slash sheets 99, 101, 121, 124, 126, and 129 have a new requirement for reporting z-axis CTE in %TE from 50 to 260 C Both the slope above Tg and the temperature at Tg are important to understanding the total expansion of the materialWhen the data sheet lists PTE, and the top temperature is sufficient to your application, then it is far easier to compare competing materials to each other and their expansion response to the assembly temperature For Test Method TM-2424 (TMA), the sample is 025 025 in 020 in minimum; for increased accuracy, the sample should be between 0030 and 0060 in The sample has no internal or external copper, with only the resin, fillers (if applicable), and reinforcing system affecting the result Test Method 2424.

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