PS, linear

Fig. 32 Schematic representation of molecular structure and morphology observed in PS-fo-PB-fc-PS linear and star-block copolymers. Oblique lines between blocks for LN2 and ST2 indicate tapered transition of dissimilar blocks. From [102], Copyright 2003 Wiley...

Uses Lubricant and release agent for PVC, polyolefins, polyamide, PS, linear polyesters, TPU, thermosets carrier for pigment cones. emulsifier in cosmetics Trade Name Synonyms Licolub WE4 [Clariant http //www. clariant com, http //www. clariant-northamerica. com]... 

In 1965 Shell Oil Co. introduced styrenic TPEs, under the trade name Kraton, which are polystyrene-b-polyisoprene(or polybutadiene)- -polystyrene (PS-b-PI(or PBd)- -PS linear triblock copolymers, made by anionic polymerization. Later, BASF introduced styrenic PTEs having tapered blocks (i.e., Styroflex). The typical styrene content of TPEs is between 25 and 40wt.%. When more stable TPEs, toward oxygen. 

Figure 8.10. The normalised root mean square layer thickness for the PS block as a function of the grafting density of a spread film of a PDMS-PS linear diblock copolymer at the surface of ethyl benzoate. After Kent et al. (1995).

Analysis of multicydic and grafted PS. Linear PS separated from grafted PS and from poly(chloromethylstyrene). 

All surfactants were tested at 1% of active ingredients. Abbreviations sodium lauryl sulfate (SLS), sodium laureth sulfate with x ethoxylations (SLEX-xEO), ammonium lauryl sulfate (ALS), paraffine sulfonate (PS), linear alkyl benzene sulfonate (LAS), sulfosuccinate (sulfo), sodium cocoyl isethionate (SCI), mono alkyl sulfate (MAP), cocamidopropyl betaine (CAPB), alkyl polyglucoside (APG), alcohol ethoxylate (Ale. ethbx.). 

Sample code can be denoted as follows ps, linear polystyrene first two digits, molecular weight in 10 g/mole of the first polymer last two digits, molecular weights in 10 g/mole of the second polymer. 

TABLE 11.5 Molecular Characteristics of the (PCL2)- -(PS2) Miktoarm Star and PCL-i-PS Linear Block Copolymers... 

Fig. 5. Theory vs. experiment rupture forces computed from rupture simulations at various time scales (various pulling velocities Vcant) ranging from one nanosecond (vcant = 0.015 A/ps) to 40 picoscconds (vcant = 0.375 A/ps) (black circles) compare well with the experimental value (open diamond) when extrapolated linearly (dashed line) to the experimental time scale of milliseconds.

A linear dependence approximately describes the results in a range of extraction times between 1 ps and 50 ps, and this extrapolates to a value of Ws not far from that observed for the 100 ps extractions. However, for the simulations with extraction times, tg > 50 ps, the work decreases more rapidly with l/tg, which indicates that the 100 ps extractions still have a significant frictional contribution. As additional evidence for this, we cite the statistical error in the set of extractions from different starting points (Fig. 2). As was shown by one of us in the context of free energy calculations[12], and more recently again by others specifically for the extraction process [1], the statistical error in the work and the frictional component of the work, Wp are related. For a simple system obeying the Fokker-Planck equation, both friction and mean square deviation are proportional to the rate, and... 

Polystyrene [9003-53-6] (PS), the parent of the styrene plastics family, is a high molecular weight linear polymer which, for commercial uses, consists of - 1000 styrene units. Its chemical formula (1), where n = - 1000, tells htde of its properties. 

More recent process research aimed at anionic PS is that of BASF AG. Unlike the Dow Process, the BASF process utilizes continuous linear-flow reactors (LFR) with no back-mixing to make narrow polydispersity resins. This process consists of a series alternating reactors and heat exchangers (Fig. 22). Inside the reactors, the polymerization exotherm carries the temperature from 30°C at the inlet to 90°C at the outlet. The heat exchangers then take the temperature back down to 30°C. This process, which requires no solvent, results in the formation of narrow polydispersity PS. 

Fig. 28. Linear and CSTR reactor configuration used commercially for PS manufacture (see also Fig. 20).

LDPE = low density polyethylene LLDPE = linear low density polyethylene HDPE = high density polyethylene PP = polypropylene PVC = polyvinyl chloride PS = polystyrene ABS = polyacrylonitrile-butadiene-styrene. 

Linear-amorphous polymers (like PMMA or PS) show five regimes of deformation in each of which the modulus has certain characteristics, illustrated by Fig. 23.1. They are ... 

The above information is conveniently summarised in the modulus diagram for a polymer. Figure 23.7 shows an example it is a modulus diagram for PMMA, and is typical of linear-amorphous polymers (PS, for example, has a very similar diagram). The modulus E is plotted, on a log scale, on the vertical axis it runs from 0.01 MPa to... 

Figure 13 Center-of-mass mean-square displacements computed from MD simulations at 323 K. (a) DPPC motion in the plane of a lipid bilayer averaged over 10 ps (b) DPPC motion in the plane of a lipid bilayer averaged over 100 ps (c) comparison of the DPPC m-plane mean-square displacement to linear and power law functions of time (d) comparison of the center-of-mass mean-square displacement from an MD simulation of liquid tetradecane to a linear function of time.

The main results of this miero-mechanical model in the quasi-static regime have been compared with experimental results obtained by placing polystyrene (PS)-polyvinyl pyridine (PVP) diblock copolymers with a short PVP block between PS and PVP homopolymers. The fracture toughness was found to increase linearly with E from that of the bare PS/PVP interface, while the slope of the line increased with the degree of polymerization of the block being pulled out. If the data for the different copolymers were plotted as AG vs. (where... 

For a tubular (plug flow) reaetor, the eonditions at any point in the reaetor are independent of time, and the linear veloeity v of the reaeting mixture is the same at every point in a eross-seetion S perpendieular to the flow direetion and equal to (G/pS). The eom-position of the reaetion mixture depends on the distanee L from the inlet point. 

The effects of the concentration of divinylbenzene on pore-size distribution and surface areas of micropores, mesopores, and macropores in monosized PS-DVB beads prepared in the presence of linear polymeric porogens have been studied (65). While the total surface area is clearly determined by the content of divinylbenzene, the sum of pore volumes for mesoforms and macropores, as well as their pore-size distribution, do not change within a broad range of DVB concentrations. However, the more cross-linked the beads, the better the mechanical and hydrodynamic properties. 

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