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• W3048253596 endingPage "1778" @default.
• W3048253596 startingPage "1778" @default.
• W3048253596 abstract "Structural relaxation in polymers occurs at temperatures in the glass transition range and below. At these temperatures, crystallization is controlled by diffusion and nucleation. A sequential occurrence of structural relaxation, nucleation, and crystallization was observed for several homopolymers during annealing in the range of the glass transition. It is known from the literature that all of these processes are strongly influenced by geometrical confinements. The focus of our work is copolymers, in which the confinements are caused by the random sequence of monomer units in the polymer chain. We characterize the influence of these confinements on structure formation and relaxation in the vicinity of the glass transition. The measurements were performed with a hydrogenated nitrile-butadiene copolymer (HNBR). The kinetics of the structural relaxation and the crystallization was measured using fast differential scanning calorimetry (FDSC). This technique was selected because of the high sensitivity, the fast cooling rates, and the high time resolution. Crystallization in HNBR causes a segregation of non-crystallizable segments in the macromolecule. This yields a reduction in mobility in the vicinity of the formed crystals and as a consequence an increased amount of so-called “rigid amorphous fraction” (RAF). The RAF can be interpreted as self-assembled confinements, which limit and control the crystallization. An analysis of the crystallization and the relaxation shows that the kinetic of both is identical. This means that the Kohlrausch exponent of relaxation and the Avrami exponent of crystallization are identical. Therefore, the crystallization is not controlled by nucleation but by diffusion and is terminated by the formation of RAF." @default.
• W3048253596 created "2020-08-13" @default.
• W3048253596 creator A5002875520 @default.
• W3048253596 creator A5028840678 @default.
• W3048253596 date "2020-08-08" @default.
• W3048253596 modified "2023-10-18" @default.
• W3048253596 title "Competition between Structural Relaxation and Crystallization in the Glass Transition Range of Random Copolymers" @default.
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• W3048253596 doi "https://doi.org/10.3390/polym12081778" @default.
• W3048253596 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/7465651" @default.
• W3048253596 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/32784476" @default.
• W3048253596 hasPublicationYear "2020" @default.
• W3048253596 type Work @default.

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