Abstract
The number of cross-links in the non-linear polyurethane structure is the basic factor affecting its properties. Selected properties of aliphatic polyurethanes with soft segments made of different amounts of polycaprolactonetriol, polycaprolactonediol and synthetic, telechelic poly([R,S]-3-hydroxybutyrate) were determined. On the basis of changes in polyurethane properties, the correlation between these properties and the construction of soft segments was found. The structure of polyurethanes, their morphology, hydrophilicity, thermal and mechanical properties were examined. These properties were changed linearly up to 15% content of polycaprolactonetriol in soft segments. A further increase in the amount of triol causes that these properties are mainly determined by the high number of cross-links.
Highlights
Polyurethanes are versatile materials, and due to their easy modification, can be used in many industries
A method to obtain environmentally friendly or compatible with a living organism polyurethane can be to use a natural compound for its synthesis, e.g., polyhydroxybutyrate (PHB)
The analysis of the results of the second heating confirmed compliance with the results presented in [11], which indicated that an increase in Mc resulted in an increment of Tg
Summary
Polyurethanes are versatile materials, and due to their easy modification, can be used in many industries. Considering the theoretical structure of branched and cross-linked polyurethanes, their properties are mainly affected: (i) By the characteristics of substrates used for their building (such as hydrophilicity, crystallinity, degradability, etc.); (ii) by the molecular weight and the degree of polymerization; (iii) by the degree of branching/cross-linking and length of chains between branching/cross-linking nodes; (iv) and by the number of short and long side chains. These parameters affect the ability to form hydrogen bonds, and this influences almost all properties of the material: Its crystallinity, mechanical strength, wettability, sorption properties, degradability and many others. Three series of polyurethanes, different with regard to their amount of polycaprolactone triol and poly([R,S]-3-hydroxybutyrate) diol were synthetized and characterized
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