Shengjie Liu

Sonication effect on the mechanical properties of MWCNTs reinforced natural rubber

Publisher: SAGE Publications

Date: 03-06-2013

DOI: 10.1177/0021998312443394

Abstract: This study investigated the sonication effect on the mechanical properties of thermoplastic natural rubber (TPNR) nanocomposites reinforced by multi-walled carbon nanotubes (MWCNTs). The TPNR nanocomposites were prepared using the melt blending method from polypropylene, natural rubber and liquid natural rubber as a compatibilizer, respectively, with 1% of MWCNTs. The results showed that a good dispersion on nanotubes was achieved by sonication. An optimal sonication time of 1 h was found to produce nanocomposites with maximum tensile and impact strength. The Young’s modulus, tensile strength, elongation at break and impact strength increased by almost 11%, 21%, 43% and 50%, respectively as compared with a pristine TPNR s le. The effect of sonication was also confirmed by dynamic mechanical analysis, it showed that the storage modulus E′, loss modulus E″ and glass transition temperature ( T g ) also increased for all MWCNTs reinforced s les. Scanning electron micrographs confirm the effect of good dispersion of MWCNTs and their interfacial bonding in TPNR after sonication.

Prolonged milk provisioning in a jumping spider

Publisher: American Association for the Advancement of Science (AAAS)

Date: 29-11-2018

DOI: 10.1126/SCIENCE.AAT3692

Abstract: Lactation is a mammalian attribute, and the few known nonmammal ex les have distinctly different modalities. We document here milk provisioning in a jumping spider, which compares functionally and behaviorally to lactation in mammals. The spiderlings ingest nutritious milk droplets secreted from the mother’s epigastric furrow until the subadult stage. Milk is indispensable for offspring survival in the early stages and complements their foraging in later stages. Maternal care, as for some long-lived vertebrates, continues after the offspring reach maturity. Furthermore, a female-biased adult sex ratio is acquired only when the mother is present. These findings demonstrate that mammal-like milk provisioning and parental care for sexually mature offspring have also evolved in invertebrates, encouraging a reevaluation of their occurrence across the animal kingdom, especially in invertebrates.

Thermal behavior of MWNT-reinforced thermoplastic natural rubber nanocomposites

Publisher: SAGE Publications

Date: 08-12-2011

DOI: 10.1177/0731684410391512

Abstract: This article studies the thermal properties of a multi-walled carbon nanotube (MWNT)-reinforced thermoplastic natural rubber (TPNR) nanocomposite. The nanocomposite was prepared using a melt blending method. Various percentages (1, 3, 5, and 7 wt%) of MWNTs were added into TPNR to improve its thermal properties. The laser flash technique was also employed to determine the thermal conductivity, thermal diffusivity, and specific heat capacity of the nanocomposite. The DMA result showed that the glass transition temperature (T g ) increased with the increase in MWNT content. TEM micrographs also demonstrated that a good dispersion of MWNTs was achieved in the TPNR environment.

National University Of Malaysia

Location: Malaysia

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Hebei Agricultural University

Location: China

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Al-Hussein Bin Talal University

Location: Jordan

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South China Botanical Garden

Location: China

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Xishuangbanna Tropical Botanical Garden

Location: China

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