Thermal Transitions in P3HT:PC60BM Films Based on Electrical Resistance Measurements.

In this paper, we present research on thermal transition temperature determination in poly (3-hexylthiophene-2,5-diyl) (P3HT), [6,6]-phenyl-C61-butyric acid methyl ester (PC60BM), and their blends, which are materials that are conventionally used in organic optoelectronics. Here, for the first time the results of electrical resistance measurements are explored to detect thermal transitions temperatures, such as glass transition T and cold crystallization T of the film. To confirm these results, the variable-temperature spectroscopic ellipsometry studies of the same samples were performed.

DTSGUI: A Python Program to Process and Visualize Fiber-Optic Distributed Temperature Sensing Data.

Fiber-optic distributed temperature sensing (FO-DTS) has proven to be a transformative technology for the hydrologic sciences, with application to diverse problems including hyporheic exchange, groundwater/surface-water interaction, fractured-rock characterization, and cold regions hydrology. FO-DTS produces large, complex, and information-rich datasets. Despite the potential of FO-DTS, adoption of the technology has been impeded by lack of tools for data processing, analysis, and visualization.

The impact of shape memory test on degradation profile of a bioresorbable polymer.

The semicrystalline poly(L-lactide) (PLLA) belongs to the materials with shape memory effect (SME) and as a bioresorbable and biocompatible polymer it have found many applications in medical and pharmaceutical field. Assessment of the SME impact on the polymer degradation profile plays crucial role in applications such as drug release systems or in regenerative medicine. Herein, the results of in vitro degradation studies of PLLA samples after SME full test cycle are presented.

Crystallinity as a tunable switch of poly(L-lactide) shape memory effects.

Materials with shape memory effect (SME) have already been widely used in the medical field. The interesting part of this group is represented by double function materials. The bioresorption and SME ability are common in polyesters implants.

Electronic structure of poly(azomethine) thin films.

Poly(1,4-phenylene-methylidynenitrilo-1,4-phenylenenitrilomethylidyne) (PPI) backbone approximated with poly(p-phenylene vinylene)like polymer composed of alternate phenylene and vinylenelike units is treated within pi electron approximation in terms of the chain composed of united atoms built up of virtual benzene and ethylene atoms. Electronic structure of the united atom is derived from interactions of benzene p and beta bands with V band of ethylene, taking into account that continuity of their pi systems results from overlap of vinylenelike highest occupied molecular orbital and lowest unoccupied molecular orbital orbitals with relevant components of benzene molecular orbitals having phase at parapositions. Electronic band structure has been derived within pi-electron approximation in a way resembling tight binding approximation usually applied to semiconductors.

Influence of long-chain aliphatic dopants on the spectroscopic properties of polyketimine containing 3,8-diamino-6-phenylphenanthridine and ethylene linkage in the main chain. Noncovalent interaction: proton transfer, hydrogen and halogen bonding.

The spectroscopic properties of the aromatic polyketimine containing 3,8-diamino-6-phenylphenanthridine and ethylene linkage in the main chain (PK1) before and after doping are dominated by an interplay of electron-donating and electron-withdrawing effects mediated by its nitrogen atom and active groups in the dopants, respectively. Hydrogen and halogen bond formation or molecular recognition between PK1 and decanoic acid (DCA), n-decyl alcohol (DA), 1,10-dibromodecane (DBr), and n-decyl sulfonic acid (DSA) was investigated in comparison with undoped PK1. UV-vis and Fourier transform infrared (FTIR) absorption, wide-angle X-ray diffraction (WAXD), and the atomic force microscopy (AFM) technique are used to probe the spectroscopic properties of the phenanthridine "core" of PK1 as well as its complexes.