Aminopropyl Polydimethylsiloxane Research Articles

Effects of Hybrid Polymeric Material Based on Polycaprolactone on the Environment.

Polymers are of great interest in areas such as agriculture, medicine and pharmacy, the food and cosmetic industries, and the chemical and construction industries. However, many polymers are nonbiodegradable and are not environmentally friendly. They are highly resistant to degradation and therefore can lead to waste disposal problems. In recent years, the interest in the microbial degradation of polymeric materials has grown due to the desire for less waste pollution in the environment. In this study, the biodegradable polymer that was obtained by the ring-opening polymerization of ε-caprolactone (CL) using an aminopropyl-polydimethylsiloxane (APDMS) oligomer and the effects of the polymer towards the growth and development of tomato plants (Lypercosium esculentum) were investigated. The obtained product was characterized using FTIR spectroscopy, NMR spectroscopy, and energy dispersion spectroscopy (EDX) analysis, and the effects of this compound on the evolution of tomato plants (Lypercosium esculentum) were studied. We also studied the biological stability of the product by identifying some of the microorganisms that developed on the surface, given its susceptibility to biodegradation.

Unexpected Fluorescence Emission Behaviors of Tetraphenylethylene-Functionalized Polysiloxane and Highly Reversible Sensor for Nitrobenzene

Tetraphenylethylene (TPE), a typical luminogen with aggregation-induced emission (AIE) features, has been widely used to prepare AIE fluorescent materials. In this study, TPE-functionalized polydimethylsiloxane (n-TPE-AP-PDMS) was successfully synthesized by attaching TPE to polydimethylsiloxane via aza-Michael addition. The introduction of polydimethylsiloxane to TPE had no obvious effect on photophysical properties. Intriguingly, n-TPE-AP-PDMS exhibited two opposite fluorescence emission behaviors in different systems: aggregation-induced quenching (ACQ) behavior in a tetrahydrofuran/water mixture and typical AIE phenomenon in a tetrahydrofuran/hexane mixture. This unexpected transition from ACQ to AIE can be attributed to a twisted intramolecular charge-transfer effect and flexible aminopropyl polydimethylsiloxane. n-TPE-AP-PDMS was further used as a fluorescent probe to detect nitrobenzene and it showed high quenching efficiency. Moreover, the n-TPE-AP-PDMS film showed high reversibility so that the quenching efficiency remained constant after five cycles. This work can provide a deeper understanding of AIE behavior and guidance to develop a new AIE polymer for chemosensors with high performance.

Improved Physico-chemical Properties of Mesoporous Carbon by Functionalization with Aminopropyl-polydimethylsiloxane (AP-PDMS)

The present research reports on the synthesis and properties of mesoporous carbon (MC) surface with functionalized aminopropyl-polydimethylsiloxane (AP-PDMS). The aim of MC surface modification was focused on the improvement of its electrical properties (EC electric conductivity), as well as its sorption capacity for cesium ions. In order to anchor AP-PDMS molecules, an intermediate functionalization step of the MC surface with carboxylic groups was carried out. In this respect, two different methods, namely: (i) sonication in the presence of the hydrogen peroxide (MC-COOH) and (ii) gas-plasma activation (MCA) have been considered for carbon surface oxidation. Further, AP-PDMS component was crosslinked to the COOH-reached carbon surface. Fourier transform infrared spectroscopy (FT-IR) and energy dispersion spectroscopy (EDX) were used to confirm the presence of AP-PDMS molecules on MC surface. Morphological and textural properties of the obtained composites have been investigated by using scanning electron microscopy (SEM), transmission electron microscopy (TEM), and nitrogen adsorption–desorption measurements, as well as their electrical properties (EC). The obtained results reveal the grafting of silane-containing component onto MC surface, an improved electrical conductivity of the synthesized composites toward MC sample. Also, the functionalization proved to be efficient in the sorption process of the cesium ions from aqueous solutions, despite the fact that the materials surface became hydrophobic.

Application performance and surface morphologies of amino polysiloxanes with different amino values and amino types

AbstractAmino polysiloxanes (APSs) with different amino values and amino types were synthesized and applied to cotton fabrics. Softening and smoothening properties of the fabrics treated with APSs were investigated and evaluated by measuring wrinkle recovery angles and friction coefficients, and the morphological features of the APSs adsorbed onto cellulose substrate films were characterized by atomic force microscope (AFM). The results indicate that the amino values and amino types of the APSs have a significant impact on the softening and smoothening properties of the fabrics. APSs with relatively high amino values exhibit superior smoothening property, while APSs with moderate amino values exhibit excellent softening property. Compared to the traditional softener N‐β‐aminoethyl‐γ‐aminopropyl polydimethylsiloxane (APS‐1), the new amino type softeners γ‐piperazinylpropyl polydimethylsiloxane (APS‐2) and N‐γ'‐dimethylaminopropyl‐γ‐aminopropyl polydimethylsiloxane (APS‐3) gave better fabric performance, whereas aminopropyl polydimethylsiloxane (APS‐4) and N‐cyclohexyl‐γ‐aminopropyl polydimethylsiloxane (APS‐5) gave unsatisfactory fabric performance. © 2010 Wiley Periodicals, Inc. J Appl Polym Sci, 2011

Preparation of Microemulsions of the Polysiloxanes Modified with Different Amines and Their Effect on the Color Shade of Dyed Cellulose

The microemulsions of three polysiloxanes modified with different amines are prepared. Three functional polysiloxanes are aminopropyl polydimethylsiloxane AP-PDMS, N-(β-aminoethyl)-γ-aminopropyl polydimethylsiloxane AEAP-PDMS, and N,N-(γ-dimethylamino-propyl)-γ-aminopropyl polydimethylsiloxane DMAP-PDMS, respectively. The effect of the microemulsions on the color shade of the dyed cellulose with reactive dyes is investigated by reflectance spectra, color yield (K/S), and the color differences (Δ E). The results show that the K/S of the yellow fabric treated with AP-PDMS decreased. The K/S of the red fabrics treated with AP-PDMS, AEAP-PDMS, and DMAP-PDMS all had very slight increase.The K/S of the blue fabrics treated with AP-PDMS, AEAP-PDMS, and DMAP-PDMS also all increased. The handle of the sample treated with AEAP-PDMS was better than those of the other samples, but the whiteness of it was worse. The wash fastness and the wet rubbing fastness of the dyed fabrics treated with three functional silicones had not noticeable change.

The Influence of Diphenyl Siloxane on Morphology and Physical Properties in the Poly(Imide Siloxane)(PIS) Copolymer

Various numbers of diphenyl-siloxane groups were incorporated in α,ω-bis(aminopropyl)polydimethylsiloxane (APPS) to prepare α,ω-bis(aminopropyl)-polydimethyldiphenylsiloxane (APPPS) oligomers of three different number-average molecular weights(Mn = 547,772,1210 g mol−1).These APPPS oligomers were than used, together with 3,3′,4,4′-bezonphenone tetracarboxylic dianhydride (BTDA) and 2-2′-bis[4-(3-aminophenoxy)phenyl] sulfone (m-BAPS), to synthesize a series of APPPS containing poly(imide siloxane) (PIS) copolymers. Microstructural studies showed that at certain APPPS content, a critical microphase separation point existed, beyond which, microphase separation began to develop. This critical point of microphase separation was found to be affected by the Mn of the APPPS oligomers (8.0, 4.3 and 2.1 mol% for Mn of 547, 772 and 1,210 g mol−1, respectively). Diphenyl-siloxane significantly improved compatibility between polyimide and polysiloxane segments. Physical studies showed that the introduction of diphenyl siloxane changed the thermal stabilities and mechanical properties of the PIS copolymers. These findings have potential applications for design purposes in engineering polymers.

Grafting of ethylene–ethyl acrylate–maleic anhydride terpolymer with amino‐terminated polydimethylsiloxane during reactive processing

AbstractAn ethylene–ethyl acrylate–maleic anhydride copolymer (EEAMA) is grafted with aminopropyl polydimethylsiloxane (PDMS) via melt reactive mixing at 140°C. The materials produced split into two components based on their solubility in acetone. The acetone soluble material is highly enriched in PDMS, whereas the insoluble material contains levels of PDMS that are lower than the proportions added to the reaction mixture. It was found that for all reaction mixtures the PDMS content in the acetone insoluble solids increases with mixing time. Molecular weight distributions of materials become narrower as the amount of PDMS increases. Rheological testing shows that the level of PDMS in the mixtures and the presence of the acetone soluble fractions give rise to significant changes in the complex viscosity and elastic moduli for the polymers. © 2006 Wiley Periodicals, Inc. J Appl Polym Sci 101: 4230–4237, 2006