Plasma Science and Technology

Boenig, Herman V.

doi:10.7591/9781501741388

Cited by 177 publications

(21 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Plasma is a powerful and versatile technique which is able to dramatically alter the surface chemical composition and morphology of a substrate without affecting its bulk properties (Boenig, 1982; Yasuda, 1985; Chu et al , 2002; Rhodes et al , 2007). Different laboratories generated amine moieties on polymeric surfaces by using plasma of different molecules (Sipehia et al , 1986; Gombotz and Hoffman, 1988; Pringle et al , 1996).…”

Section: Introductionmentioning

confidence: 99%

Surface grafting thermoresponsive PEO-PPO-PEO chains

Malal¹,

Malal²,

Cohn³

2010

J Tissue Eng Regen Med

View full text Add to dashboard Cite

The objective of this study was to engineer surfaces comprising covalently bound polyethylene oxide-polypropylene oxide-polyethylene oxide (PEO-PPO-PEO) chains, able to coil and uncoil in aqueous media, as a function of temperature. Thermoresponsive surfaces can be used in diverse areas, such as tissue engineering and 'on-command' drug delivery. The grafting scheme was exemplified using a poly(ethylene terephthalate) (PET) film and started with the exposure of the substrate to plasma of ammonia, whereby amine groups were formed on the film. In the next stage, the amine moieties reacted with the hydroxyterminated thermoresponsive PEO-PPO-PEO triblocks via the hexamethylene diisocyanate (HDI) coupling agent. XPS analysis of the PET film after being exposed to plasma of ammonia revealed substantial amounts of nitrogen, as revealed by the sizeable N1s peak observed at 400.2 eV. A large increase in the C1s ether peak at 286.5 eV was apparent after binding the PEO-PPO-PEO triblocks to the substrate. These findings were confirmed by FTIR spectroscopy and supported by water contact angle measurements. PEO-PPO-PEO triblocks were chain extended by reacting them with HDI, whereby longer polyether urethane chains were formed. The long thermoresponsive chains produced (P-F127) were then tethered to the PET surface, following the procedure used to graft the shorter F127 triblocks. The thermoresponsiveness of the surface was demonstrated by measuring the water contact angle of the P-F127-containing surfaces as a function of temperature.

show abstract

Section: Introductionmentioning

confidence: 99%

Surface grafting thermoresponsive PEO-PPO-PEO chains

Malal¹,

Malal²,

Cohn³

2010

J Tissue Eng Regen Med

View full text Add to dashboard Cite

show abstract

“…In conclusion, the use of cold plasmas to change the surface state of materials seems promising because the final state results from the equilibrium, which can be modified, between the surface functionalization and degradation processes. These treatments are, however, technologically complex (33).…”

Section: Cold Plasmasmentioning

confidence: 99%

An overview of the basic aspects of polymer adhesion. Part II: Application to surface treatments

Fourche

1995

Polymer Engineering & Sci

View full text Add to dashboard Cite

The main surface treatments of materials (metals and plastics in particular) to be joined are presented. It is observed that these treatments modify the roughness, morphology, and chemical composition of the surface. As a result of these operations, the substrate surface energy is generally increased. A correlation is often noted between the increased surface energy and the assembly adhesive qualities.

show abstract

“…Plasma refers to a state of matter in which a significant number of atoms and/or molecules are electrically charged or ionized. 3 In cold plasmas, there is no thermal equilibrium between the electrons and the remaining fragments that compose the plasma, with the temperature of the electrons greater by around two orders of magnitude to that of the gas (i.e., T electron /T gas ϳ 10 -100). The temperature of the electrons can reach around 1 to 10 electron volts at an electron density between 10 9 and 10 12 electrons/cm 3 .…”

Section: Introductionmentioning

confidence: 99%

“…Hot plasmas are almost totally ionized gases, whereas the degree of ionization in cold plasmas is between 1 and 5%. 3,4 The transfer of energy to the molecules leads to the formation of a variety of new species including metastables, free radicals, and ions. All these products are chemically active and therefore can serve as precursors for the formation of new stable products.…”

Section: Introductionmentioning

confidence: 99%

Lignin–polypropylene composites. II. Plasma modification of kraft lignin and particulate polypropylene

Toríz

Ramos

Young

2003

J of Applied Polymer Sci

View full text Add to dashboard Cite

Indulin kraft lignin and polypropylene were subjected to plasma treatments in a rotating electrodeless plasma reactor at 13.56 MHz radio frequency, with the goal of improving the strength properties of the composites made from these materials. It was shown that efficient surface modification could be achieved by these plasma treatments, avoiding long reaction times and large volumes of reactants for modification by conventional wet chemistry. SiCl 4 -plasma treatments of lignin at 100 and 200 W resulted in silicon implantation in the range of 4 -10% that depended on the treatment time. However, the effect of power in the treatments was minimal, given that changes in silicon implantation were not observed for changes in this parameter. SiCl 4 -plasma treatment of polypropylene at 80 W, 1 and 10 min, resulted in silicon implantation in the order of 10 -15%, for the two different treatment times, showing that low power and short treatment times were sufficient to significantly alter the polypropylene surface. However at high power (250 W), the longer treatment time of polypropylene apparently led to formation of oligohalosilanes. Other plasma treatments in the rotating reactor such as plasmainduced copolymerization of acryloyl chloride on both lignin and polypropylene, and plasma-state polymerization of acryloyl chloride on polypropylene under pulsing conditions, resulted in thin film depositions. Evaluation of composites from these treated materials is described in the next contribution (Part III) from this series.

show abstract

Plasma Science and Technology

Cited by 177 publications

References 0 publications

Surface grafting thermoresponsive PEO-PPO-PEO chains

Surface grafting thermoresponsive PEO-PPO-PEO chains

An overview of the basic aspects of polymer adhesion. Part II: Application to surface treatments

Lignin–polypropylene composites. II. Plasma modification of kraft lignin and particulate polypropylene

Contact Info

Product

Resources

About