Bifunctional crosslinking reagents have been used in studies of the spatial arrangement of muscle contractile proteins, such as myosin and actin, either in their soluble forms [ 1,2], or in synthetic filaments [3-51, or even in myofibrils [3]. The most commonly used reagents are the bisimidates, which are very reactive, but also quite unstable in aqueous solution; incomplete substitution and un...

A hydrogel was prepared by crosslinking aqueous solutions of sulfonated polyacrylamide/chromium triacetate for use in water shut off operations. Gel swelling and the effects of salinity, injection time and flow rate on residual resistance factor (Frr) were investigated. In the presence of electrolytes, gel swelling decreased by about 80%. Results showed that oil permeability increased as inject...

The spatially directed 3-dimensional (3D) remodeling of synthetic materials may be useful to regionally control cell behavior. In this work, we developed a process to synthesize hyaluronic acid hydrogels using multiple modes of crosslinking applied sequentially; a primary addition reaction to introduce protease degradable peptide crosslinks, then a UV light-induced secondary radical reaction (e...

Poly(vinyl alcohol) is crosslinked in dilute solution (c = 0.1 wt%) with glutaraldehyde. The reaction product is characterized by viscometry and gel permeation chromatography (g.p.c.). The intrinsic viscosity decreases with increasing degree of crosslinking and does not depend on temperature. G.p.c. reveals that the reaction product is not homogeneous, but consists of a mixture of particles wit...

In this study, dimmer-acid-based hybrid nonisocyanate polyurethanes (HNIPUs) were synthesized by the one-step method without catalyst. Three polyamines and two epoxy resins were selected as raw materials for HNIPU, and cyclic carbonate was synthesized based on our previous work. All of the products were characterized by Fourier transform infrared spectroscopy (FTIR), differential scanning calor...

Hyaluronic acid (HA) is a natural linear polysaccharide that has been used extensively in the biomedical field as it is a biocompatible, biodegradable, nontoxic and non-immunogenic polymer with high water affinity. Besides, the presence of multiple acid and hydroxyl groups in the HA molecule makes it an ideal candidate for chemical modification. The present paper describes the synthesis and cha...

objective(s): to improve water stability of electrospun chitosan/ polyethylene oxide (peo) nanofibers, genipin, a biocompatible and nontoxic agent, was used to crosslink chitosan based nanofibers.  materials and methods: different amounts of genipin were added to the chitosan/peo solutions, chitosan/peo weight ratio 90/10 in 80 % acetic acid, and the solutions were then electrospun to form nano...

A new concept is introduced in this study, suggesting the role played by ZnO crystal sulfur crosslinking polymers, particularly, rubber blends of EPDM-CTS. The study conducted a polymer blend ethylene propylene diene terpolymer (EPDM) and cyclic tetrasulfide (CTS). CTS reactive low molecular weight polymer, which can act as donor. It proposed that occurs at surface crystals. reaction site creat...

Hydrogels represent an attractive soft material with promising applications in many fields. Conventional methods for hydrogel preparation typically involve heat curing either by water-bath (WB) heating or microwave (MW) irradiation to facilitate crosslinking. However, a detailed investigation of the influence WB- and MW-mediated crosslinking process on characteristics hydrogels has been rarely ...

Chitosan-nanoclay bio-hybrid films were successfully crosslinked with glutaraldehyde, genipin and glyoxal. Moisture sensitivity of films decreased as a result of crosslinking which led to improved barrier properties against water vapor and oxygen. Films containing chitosan (6.6 g/m) with genipin (3.3 g/m) and nanoclay (6.6 g/m) had water vapor transmission rate of 72 g × 100 μm/(m × 24 h) which...