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Herein, we introduced a novel individual sperm freezing device named SpermCD, which consists of a right angular cryopiece (RA‐Cryopiece, or "C") and a grooved petri dish ("D"). SpermCD allows embryologists to transfer sperm and perform ICSI on the same focal plane. Thirty‐five patients underwent single sperm cryopreservation using SpermCD, including four patients with non‐obstructive azoospermia (NOA), 14 patients with virtual azoospermia and 17 patients with cryptozoospermia. One hundred and twenty‐five cryopreserved spermatozoa from nine patients were thawed on the day of the oocyte retrieval and 121 spermatozoa were found, with a sperm recovery rate of 97.1 ± 4.6%. Sixty‐five MII oocytes from their spouse were injected with thawed sperm. Normal fertilization and high‐quality embryo rates were 68.0% ± 33.2% and 24.4% ± 22.2%. Nineteen transplantable embryos were formed after fertilization with frozen sperm, eight of which were transplanted in five couples, resulting in four successful deliveries. SpermCD is a simple and practical individual sperm freezing device. [ABSTRACT FROM AUTHOR]

Poly(melamine-urea-formaldehyde) (MUF) microcapsules used as self-healing component of composites were prepared by in situ polymerization. The surface of MUF microcapsules was modified by 3-aminopropyltriethoxy silane-coupling agent (KH550). The interfacial interactions between MUF microcapsules and KH550 were studied by Fourier transform infrared spectra (FTIR). FTIR results show that the silane-coupling agent molecule binds strongly to the MUF microcapsules surface. A chemical bond (SiOC) is formed by the reaction between the SiOH and the hydroxyl group of MUF microcapsule. This modification improves the thermal properties of microcapsules. Optical microscope (OM) and scanning electron microscope (SEM) show that a thin layer is formed on the surface of MUF microcapsules. The interfacial adhesion effect between MUF microcapsules and unsaturated polyester matrix was investigated. MUF microcapsules disperse evenly in the composites. When crack propagated, the microcapsules were broken and the repair agent flowed from the microcapsules to react with the curing agent. Then the crosslinking structure was formed and the composite was repaired. The tensile properties, impact properties, and dynamic mechanical properties of composites have been evaluated. The results indicate that the silane-coupling agent plays an important role in improving the interfacial performance between the microcapsules and the matrix, as well as the mechanical properties of the composites. © 2012 Wiley Periodicals, Inc. J. Appl. Polym. Sci., 2013 [ABSTRACT FROM AUTHOR]