We report on the characterization of the morphological behavior expressed between the symmetric AB diblock and ABC triblock copolymer states. Experimentally, a gradual transformation between these states was achieved through systematic addition of PEO to a single symmetric PS−PI diblock copolymer (MW ∼ 18 800 g/mol), resulting in a series of 10 poly(styrene-b-isoprene-b-ethylene oxide) triblock copolymers varying only in the amount of PEO added. Final compositions ranged from 2.9 to 33.2 vol % (experimentally symmetric) PEO, with the remaining volume necessarily divided equally between the PS and PI segments. The molecular weight of the parent diblock was chosen such that resulting triblocks would undergo order−disorder transitions (ODTs) at experimentally accessible temperatures over much of the composition range studied. Our results focus on the detection and characterization of six morphologies observed to form between these two symmetric states and some of the kinetic and directional (heating vs cooling) characteristics of two thermally induced order−order transitions (OOTs) observed. We conclusively identify the formation of two- and three-domain lamellar structures, hexagonally packed core−shell cylinders, and the pentacontinuous core−shell gyroid morphology and speculate on probable assignments for two untypical structures also observed. Finally, we discuss some of the general behavior characteristics of this system in terms of their dependence on block connectivity and χ interaction parameter sequencing.

We report on the phase behavior of a system of lithium perchlorate-doped poly(styrene-b-isoprene-b-ethylene oxide) (SIO) triblock copolymers. Two complete phase diagrams are described along the isopleth formed by equal volume fractions of polystyrene and polyisoprene and varying poly(ethylene oxide) contents at ether oxygen-to-lithium ratios of 48:1 and 24:1 between 70 and 200 °C. Our results, based primarily on small-angle X-ray scattering (SAXS) data, reveal four phases as a function of PEO and salt content:  two-domain lamellae (LAM2), a pillared lamellar structure (PLS), core−shell cylinders (CSC), and three-domain lamellae (LAM3). Two microstructures present in the neat material, core−shell gyroid (CSG), and semiperforated lamellae (SPL), are replaced by the CSC phase in the doped systems. In addition, the order−disorder transition temperatures at low PEO content increase dramatically with the addition of salt. Within the CSC phase, LiClO4 can be dispersed up to a loading of 3:1 without inducing macroscopic phase separation. These findings are rationalized on the basis of the associated modifications to the three segment−segment interaction parameters and PEO chain statistics that accompany the selective mixing of LiClO4 in the PEO domains, thereby driving microphase separation toward the strong-segregation limit.

Bouldering outdoors has an increased risk of injury to the fingers. Preventative measures appear largely ineffective in reducing the number of injuries in both cohorts.

Our results suggest that a restrictive transfusion practice is safe for severely head-injured patients.

The prevalence of ADHD in primary school children in Vinh Long, southern Vietnam, is in the same range as other regions in the world. Therefore, awareness of ADHD needs to be raised, to ensure suitable psychiatric care for children.