Angel Romo-Uribe

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Cooling-induced crystallization of cross-linked poly(cyclooctene) films under a tensile load results in significant elongation and subsequent heating to melt the network reverses this elongation (contracting), yielding a net two-way shape memory (2W-SM) effect. The influence of cross-linking density on the thermal transitions, mechanical properties, and the(More)
A direct rheo-optical characterization of the flow-induced isotropic-nematic (I-N) transition in a semiflexible thermotropic liquid-crystalline polymer (TLCP) was investigated, using a specially constructed apparatus enabling in-situ optical microscopic observations at elevated temperatures, along with cone-and-plate rheometry. For the investigation, an(More)
The aim of this study was to characterize the influence of the aeration conditions on the production of PHB and its molecular mass in a mutant strain of Azotobacter vinelandii (OPN), which carries a mutation on ptsN, the gene encoding enzyme IIANtr, previously shown to increase the accumulation of PHB. Cultures of A. vinelandii wild-type strain OP and its(More)
The mechanical relaxation behavior and microstructure of a series of novel norbornylPOSS organic-inorganic copolymers have been investigated. We have examined the influence on physical properties of both the weight fraction of POSS-norbornyl monomer and the corner group composition. POSS refers to the polyhedral oligomeric silsesquioxane inorganic/organic(More)
A series of multiblock polyurethanes with alternating sequence structures of a poly(ε-caprolactone) (PCL) segment of 2600 or 3600 g/mol and a polyhedral oligomeric silsesquioxane (POSS) segment with multiple POSS moieties (TPU2.6k_1-x or TPU3.6k_1-x, respectively; the molar ratio of PCL:POSS is 1: x; x 1⁄4 2, 3, or 4) were synthesized through two-step(More)
This research demonstrates that a nylon nanofiber (NNF) mat can be an effective mechanical reinforcement to polyaniline (PANI) thin films. Nanofibers of ca. 250 nm diameter were produced by electrospinning of a nylon 6 solution in formic acid. Scanning electron microscopy showed that the solution impregnation method utilized was effective to embed the(More)
Sterilization, cytotoxicity and cell viability are essential properties defining a material for medical applications and these characteristics were investigated for poly(β-hydroxybutyrate) (PHB) of 230kDa obtained by bacterial synthesis from a mutant strain of Azotobacter vinelandii. Cell viability was investigated for two types of PHB scaffolds, solution(More)
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