Thermal analysis of novel underfill materials with optimum processing characteristics

Abstract

This work encompasses the development of low-viscosity cyclic oligomer underfill formulations that cure without heat evolution. Boron nitride, silica-coated aluminum nitride, and alumina ceramic powders were used as fillers in cyclic butylene terephthalate oligomer melts. The melts were heated with a suitable catalyst to induce polymerization. The effects of the filler type and composition on the thermal and mechanical properties of the poly(butylene terephthalate)/filler composites were examined with differential scanning calorimetry, temperature-modulated differential scanning calorimetry, thermogravimetric analysis, thermomechanical analysis, and dynamic mechanical analysis. Scanning electron microscopy was employed to elucidate the morphology of these composites.

Synthesis and properties of poly(butylene terephthalate)/multiwalled carbon nanotube nanocomposites prepared by in situ polymerization and in situ compatibilization

“…It is accepted that the thermal degradation of polyester is led by random chain scission or specific chain‐end scission. In our case, there may have been some residual carboxyl groups on the MWNT surface, which promoted the degradation of the polymer matrix 36. The presence of MWNTs could have increased the thermal stability because of their nice thermal conductivity and barrier effect, whereas those residual carboxyl groups facilitated the thermal degradation of the PBT matrix, more or less 43.…”

“…Moreover, the value differences between T mI and T mII became smaller as with more MWNTs. This was attributed to the fact that the double melting behavior of the filled PBT samples was much less pronounced than that of PBT, which may have been due to the broadening and overlapping of individual melting peaks typical for polymers when fillers are present 36…”

Role of Polymer Interactions with Clays and Modifiers on Nanomechanical Properties and Crystallinity in Polymer Clay Nanocomposites

“…For PBT homopolymer, ΔH • m = 141 J/g [29]; for nylon6, ΔH • m = 203 J/g [11]. This is generally considered a standard method to measure crystallinity of polymer which has been described earlier [30] and extensively used in literature [10,29,31,32] [33]. The average E r and H are obtained from 30 numbers of indentations for each specimen.…”

Preparation and Characterization of Novel Electrospinnable PBT/POSS Hybrid Systems Starting from c-PBT

“…The thermal properties obtained for the different formulation prepared are collected in Table 2. Neat PBT exhibits a double melting peak, which consists of a small peak at 210 ∘ C and a major one at 224 ∘ C. Indeed, multiple peaks, which are typical for polyesters, including PBT prepared from c-PBT, are attributed to melting and recrystallization processes of thinner and less perfect crystallites into thicker and more perfect crystalline structures with a subsequent higher melting temperature [36][37][38]. As far as POSS-based hybrids are concerned, similar melting peaks are observed.…”