Effect of dicarboxy terminated polystyrene on strengthening immiscible polystyrene/poly(methyl methacrylate) interface

The fracture toughness between polystyrene (PS)/poly(methyl methacrylate) (PMMA) reinforced with reactive polymers, poly(glycidyl methacrylate) (PGMA) and dicarboxy or monocarboxy terminated PS (dcPS and mcPS), was measured by the asymmetric fracture test. Molecular weight effect of mcPS, although the molecular weight distribution is rather polydisperse, on the maximum achievable fracture toughness, Gmax qualitatively agreed with the results of the monodisperse case4,5). In the case of dcPS with Mw 142 K, Gmax reached ca. 170 J/m2 which is nearly 8 times higher than that of mcPS of molecular weight of about 150K. From the mechanical point of view, dcPS with a degree of polymerization (N) greater than the ratio of chain breaking force to monomeric friction force (fb/fmono) is more effective in enhancing the interfacial adhesion than mcPS since it provides two stitches to the interface. It was also shown by Monte Carlo simulation on reactive polymer system that the di-endfunctional polymers are more effective than mono-endfunctional polymers in reinforcing the week interface between immiscible polymers.This work was supported by the Korea Science and Engineering Foundation (KOSEF) under Grant 94-0520-02-3. We are very grateful to the financial support from the Brain Korea 21Program through the Ministry of Education of Korea

Multiplex real-time PCR using temperature sensitive primer-supplying hydrogel particles and its application for malaria species identification - Fig 2

<p>(a) Effective capture of primer on supplimer of sPIN particle. In order to see the capturing efficiency, sPIN particles were prepared with matched (red) or mismatched (black) supplimer to primer. After incubation with FAM-modified primer, both of them showed high intensity depending on the injected FAM-primer concentration (filled red and black circle). After rinsing, mismatched sPIN particle lost the fluorescence (empty black circle), meanwhile matched sPIN particle showed consistently remained fluorescence (empty red circle). It was caused by the stable binding between the primer and corresponding supplimer. (b) Positive qPCR graph of each sPIN particle using supplimers with different T_m. (c) Negative qPCR graph of each sPIN particle with supplimers of different T_m. (d) Fluorescent signal subtracted No Template Control (NTC) signal from Positive Template Control (PTC) showing regular S-shaped curves.</p

PCR reaction with sPIN particle and multiplex qPCR.

<p>PCR reaction with sPIN particle and multiplex qPCR.</p