INTRODUCTION Polystyrene can be obtained in atactic (aPS), isotactic (iPS) or syndiotactic (sPS) form by a variety of catalytic systems1,2 and initiators. For instance, it is known that (pentamethylcyclopentadienyl)titanium derivatives activated by methylaluminoxane (MAO) afford a highly sPS, with %m (defined as meso diads content, calculated by 13C-nuclear magnetic resonance (NMR)) below the i...

A two-stage reactor system consisting of co-pyrolysis biomass and plastic in the 1st stage catalytic upgrading (zeolite ZSM-5 catalyst) derived pyrolysis gases 2nd was used to investigate yield composition product bio-oil. Biomass waste wood plastics form high density polyethylene, low polypropylene, polystyrene polyethylene terephthalate were as feedstock. The addition with co-pyrolysis-cataly...

Polystyrene/polyolefin elastomer (PS/POE) (90/10 and 80/20 wt/wt) blends containing 1, 3, 5 phr halloysite nanotubes (HNTs) in the presence absence of a compatibilizer (polypropylene-graft-maleic anhydride) were prepared using melt-mixing technique. Scanning electron microscopic studies confirmed matrix-droplet morphology. Energy dispersive spectroscopy (EDS) mapping indicated that HNTs possess...

Renal graft rupture (RGR) is a life-threatening complication of kidney transplantation (KT), frequently associated with rejection and acute tubular necrosis. RGR repair with the use of suture, and corsetage with various materials (including synthetic glue, polyglactin absorbable hemostatic mesh, and lyophilized human dura), is indicated in non-severe cases. However, the employment of non-absorb...

The viscoelasticity of several polymers has been determined using dynamic mechanical analysis (DMA). For the same materials the sliding wear in multiple scratching along the same groove has also been determined. The materials studied were polycarbonate (PC), polystyrene (PS), styrene/ acrylonitrile (SAN), Surlyn, polyethersulfone (PES), acrylonitrile/butadiene/styrene (ABS), polypropylene (PP),...

Polypropylene and PA66 are widely used in our daily life, but they cannot be welded by laser transmission welding (LTW) because of polar differences and poor compatibility. In this paper, grafting modification technology is used to improve the welding performance between polypropylene and PA66. Firstly, the strong reactive and polar maleic-anhydride (MAH) is grafted to polypropylene and infrare...

We present a simplified surgical technique performed in a 37-yr old man who presented with a pseudoaneurysm of the left coronary ostium 2 months after repair of acute type A aortic dissection by composite graft. Intraoperatively, the surgical situs showed extreme adhesions. The leakage at the level of the coronary suture line was exposed from inside the aortic graft. Repair was performed by 7.0...

The metallization procedure, proposed recently for signal improvement in organic secondary ion mass spectrometry (SIMS) (Delcorte, A.; Médard, N.; Bertrand, P. Anal.Chem. 2002, 74, 4955)., has been thoroughly tested for a set of kilodalton molecules bearing various functional groups: Irganox 1010, polystyrene, polyalanine, and copper phthalocyanine. In addition to gold, we evaluate the effect o...