Changes of Crystallization and Mechanical Properties with annealing and Boiling of Strip-Biaxially Stretched Poly(ethylene terephthalate) Films.

Tensile testing determined the effects of crystallinity on the stress-strain curves of nonstretched polyethylene terephthalate (PET) films and strip biaxially stretched PET films annealed and treated with boiling water. Analysis based on the series model of crystalline and amorphous phases of nonstretched and biaxially stretched PET films..

Study on Functionalization of Acrylonitrile Butadiene Rubber with Surface Treatment

The synthesis of 6N-allyl-1H, 1H, 2H, 2H-perfluorododecylamino-1,3,5-triazine-2,4-dithiol and 4,4'-morpholine disulfide under acidic media yielded 2,4-bis-(4-morpholinyl trithio)-6-(N-allyl-1H, 1H, 2H, 2H-perflourododecylamino)-1,3,5-trazine (RfTDM). Contact angle measurements, X-ray photoelectron spectroscopy, attenuated total reflection..

Genetics of Resistance to Root-Knot Nematodes in Some Cotton Cultivars

The cotton varieties Acala NemX and Stoneville LA887 have resistance to the root knot nematode Meloidogyne incognita. No data exist on the inheritance of resistance or whether resistance is due to unique genes. Genetic experiments crossed each cultivar with the susceptible cultivar Deltapine 90. Acala NexX was also crossed with Stoneville..

Effect of Amine Catalyst on Polyurethane Synthesis.

A prepolymer method prepared polyurethane elastomer from polycaprolactone, diphenylmethane diisocyanate, 1,4-butanediol, and trimethylolpropane. Researchers studied the effects of the amine catalyst 1,4-diazabicyclo(2,2,2)octane on the molecular structure and physical properties of the polyurethane elastomer. Use of the amine catalyst mad..

An NMR Study of the Thermal Degradation of Urethane Foams Containing Polyisocyanurate.

The inherent thermal stability of rigid polyurethane oams is based on their high isocyanate contents that result in cyclic isocyanurate moieties. Other factors that contribute to flame resistance include the diisocyanate structure and the presence of polyisocyanurate carbodiimide and amide modified isocyanurate. Polyester based foams gene..

Composite Films of Polymer-Inorganic Hybrid Nanoparticles Prepared Using Controlled/'Living' Radical Polymerization.

Experiments modified the surface of silica nanoparticles with initiators used in atom transfer radical polymerization (ATRP) to yield composite films of polymer-nanoparticle hybrids, which acted as macroinitiators in controlled/living radical polymerization. ATRP grew well defined polystyrene and polymethyl methacrylate chains from the na..

Surface Initiated Anionic Polymerization on Silica and Silicate Surfaces.

Living anionic polymerization of styrene formed polystyrene films grafted from a silicate surface. Activated 1,1-diphenylethylene-chlorosilane initiation sites formed by self assembled monolayers on silicate surfaces. Contact angle measurements, atomic force microscopy, Fourier transform infrared spectroscopy, X-ray photoelectron spectros..

Dynamics and Packing of Amorphous Polymers Studied by Multidimensional Solid-State NMR.

Characterization of molecular structure and dynamics in glassy polymers continues to be problematic for researchers involved in both experimental and theoretical studies. Becuase such critical properties as toughness depend on low temperature relaxation processes, knowledge of their microscopic origins is important for practical purposes...

Reniform Nematode Management in Georgia Cotton

The reniform nematode Rotylenchulus reniformis greatly reduces cotton yield. Form 1974-1999, its incidence in Georgia increased from less than 0.5 percent to approximately 5 percent. Management involves the use of nematicides and crop rotation. Conventional nematicide treatment recommends 5-7 pounds of Temik 15G (aldi-carb) per acre in-fu..

Dipolar Interactions in Entangled Polymers and Networks.

Research on dipolar interactions in entangled polymers and networks used the beta sine correlation method with polydimethylsiloxane networks and generated results that were significantly different from those with polydimethylsiloxane melts. Evidence existed for nonzero anisotropic dipolar interactions that were particularly sensitive to t..