Get Conformation-Dependent Design of Sequences in Copolymers II PDF

By Vladimir O. Aseyev, Heikki Tenhu (auth.), Alexei R. Khokhlov (eds.)

ISBN-10: 3540295151

ISBN-13: 9783540295150

"The two-volume set edited by means of Khokhlov covers the layout and synthesis of copolymers which are in a position to mimicking the habit of organic macromolecules, corresponding to peptides and proteins, in an aqueous answer. ...

The set is seriously weighted towards the theoretical aspect of CDSD, however it does include enough experimental effects for these within the actual and analytical parts of polymer chemistry. total, given the price of this two-volume set, it truly is not likely of basic curiosity to the complete polymer group; although, for scientists operating within the parts of amphiphilic man made polymers, biomimetic ways to polymers, and globular biopolymers, those volumes will be an excellent addition to their own libraries...."

written by way of Eric Fossum, Wright country college in J.Am.Chem.Soc. Vo. 126, No. 39, p. 13208, 2006

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Additional resources for Conformation-Dependent Design of Sequences in Copolymers II

Example text

In one study, using a sample of much lower molar mass PNIPAM44 -b-PEO110 (the indices refer to the number of NIPAM and EO units), it was shown that heat-induced micellisation of solutions of high copolymer concentration led to the formation of narrowly distributed, small, dense micelles, whereas large, loose micelles or micellar clusters formed in solutions of low block copolymer concentration [171]. The second recent report relates a thorough comparison of the phase behaviour in water of three samples, PNIPAM228 -b-PEO114 , PNIPAM143 -b-PEO114 , and PNIPAM38 -b-PEO114 , based on a battery of DLS, and small-angle neutron scattering [172].

In the dilution, the distance between polymers increases, resulting in the domination of the intrapolymeric attractive forces over interchain attraction. This leads to an enhanced surface stabilisation by the hydrophilic parts on the shrunken PNIPAM coil. In summary, the phase-separation temperature of PNIPAM-PEO block and graft copolymers significantly depends on the amount of PEO and on the polymer concentration. Above the cloud point, the size, size distribution, and structure of the aggregates sterically stabilised by a PEO shell can be adjusted by factors such as the amount of PEO, the polymer concentration, and the heating rate.

Thus, the glass-transition temperatures are 106 and 107 ◦ C for PS blocks and 118 ◦ C PtBMA [185]. These temperatures are much higher than the range of solution temperatures studied, confirming that reptation of the block copolymers out of the core is restricted. Thermosensitive blocks and homopolymers, as well, form globules with a high-density inner core at elevated temperatures, which may be diagnostic of partial vitrification (Sect. 2). 1 Poly(N-vinylcaprolactam) PVCL is one of several nonionic water-soluble polymers that undergo heatinduced phase separation in water (Fig.

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Conformation-Dependent Design of Sequences in Copolymers II by Vladimir O. Aseyev, Heikki Tenhu (auth.), Alexei R. Khokhlov (eds.)


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