Motional characteristics poly

The spectra shown in Figure 5 clearly indicate that there are two distinct motional environments in the segmented copolymers. The broad component of the spectrum arises from the majority of the hard segments which show motional characteristics similar to that of poly (butylene terephthalate). The sharp component is attributed to hard segments which reside in the soft segment matrix, either by virtue of being very short blocks, or because they form loops on the surfaces of the hard segment lamellae. 

Fig. 4.13 Momentum transfer dependence of the characteristic time associated to the self-motion of protons in the a-relaxation regime Master curve (time exponentiated to p) constructed with results from six polymers polyisoprene (340 K, p=0.57) (filled square) [9] polybutadiene (280 K, p=0Al) (filled circle) [146] polyisobutylene (390 K, p=0.55) (empty circle) [147] poly (vinyl methyl ether) (375 K, f=0A4) (filled triangle) [148] phenoxy (480 K, p=0A0) (filled diamond) [148] and poly(vinyl ethylene) (340 K, p=0A3) (empty diamond) [ 146]. The data have been shifted by a polymer dependent factor Tp to obtain superposition. The solid line displays a Q -dependence corresponding to the Gaussian approximation (Eq. 4.11). (Reprinted with permission from [149]. Copyright 2003 Institute of Physics)...

Data in Table 19 show the variations In the IMM of PMAA molecules (or poly-(acrylic acid), PAA), when these interact with insulin The polymer complex was se rated from the unreacted molecules. The great decrease in intramolecular motions in PMAA macromolecules as compared to those of PAA in polymer complexes with insulin may be due to hydrophobic interactions between methyl groups of PMAA and non-polar grou K of insulin in aqueous PMAA-insuIin solutions. Kinetic characteristics of intermolecular interactions in the polymer-polymer complexes have also been studied by tlK PL methodThe dependence of kinetic parameters of intermolecular interactions on the structure of interacting chains, their length and the chemical nature of bonds in PC has also been investigated... 

Physical properties of these poly[2] catenaries have been explored in expectation of unique properties based on the catenane structure [239, 246]. While various interesting physical properties were found in polyrotaxane, no characteristic property has been reported in [2]catenanes so far. Although poly[2]catenane has highly mobile moiety due to the mechanical bond, it has been suggested that the connection between [2]catenane subunit restricted the mobility in motion of [2]catenane. Further, intramolecular interaction in [2]catenane subunit may decrease its mobility. Secondary amide-based [2]catenanes can easily be prepared from commercially available compounds. Takata et al. found that the borane-reduction of the [2]catenanes afforded good yields of the amine-based [2]catenanes that can be useful for polymer synthesis [247, 148] (Scheme 51). Although the origi-... 

A.3. The Normal-Mode (n) Relaxation Process The term normalmode relaxation refers to the long-range motions of the end-to-end dipole moment vector along a polymer chain, and thus corresponds to the comparably slow motion of a whole chain (Adachi 1997). This relaxation mode is characteristic of polymers with dipoles fixed parallel to the mainchain (type A polymers). A representative class of such polymers are the polyethers (-CH2—CHR—O—) , with R H [e.g., poly(propylene glycol) (Hayakawa and Adachi 2001) poly(butylene oxide) (Casalini and Roland 2005)], for which, with the exception of a few members [e.g., poly(styrene oxide) (Hirose and Adachi 2005)], a strong normal-mode relaxation signal can be resolved... 

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