Abstract
The pre-experiment of the present study revealed that polyurethane (PU) synthesized using poly (hexamethylene carbonate) glycol (PHC) has high melt viscosity and is difficult to process. Therefore, poly (trimethylene carbonate) glycol (PTC) was employed to synthesize a PU product with low melt viscosity. First, four types of thermoplastic polyurethane (TPU) were formed through one-step solvent-free synthesis. TPU is presented in the format “TPU-X-Y,” with X representing the polyol (PTC or PHC, around 1000 molecular weight) and Y the chain extender (1,3-propane diol [PDO] or 1,4-butane diol [BDO]) used. The TPU was synthesized using a fixed molar ratio of (isocyanate):(polyol):(chain extender) = 2:1:1 and compared. The results indicated that chain entanglement often occurred among the long carbon chains of PHC. The synthesized TPU employed a property of PTC, namely converting polarity into reverse polarity in high temperatures, to resolve the high melt viscosity of TPU of the PHC series, which causes processing difficulties. The synthesized TPU-PTC-PDO exhibited favorable molecular arrangements. Given its polarity, TPU-PTC-PDO has outstanding tensile properties (strength at break: 41.10 ± 10.78 MPa; 100% modulus = 6.73 ± 0.12 MPa), making processing at lower temperatures (180 or 190 °C) feasible. With the inclusion of PTC, the synthesized polycarbonate TPU exhibits the advantages of polycarbonate and is suitable for a wide range of applications.
Highlights
The TPU1b used one‐step wassynthesis a suitable expression in the research, methylene diphenyl diisocyanate (MDI) should react with BDO and polyols under an irregular state, and the thermoplastic polyurethane (TPU) had the random hard segment repeat units
The Perkin Elmer Spectrum One Fourier transform infrared (FT‐IR) (Waltham, MA, US) spectrometer was set to the attenuated total reflectance mode to compare the TPU and polyol FT‐IR spectrum and elucidate their chemical structures and verify the synthesized
The Perkin Elmer Spectrum One Fourier transform infrared (FT-IR) (Waltham, MA, USA) spectrometer was set to the attenuated total reflectance mode to compare the TPU and polyol FT-IR spectrum and elucidate their chemical structures and verify the synthesized
Summary
Publisher’s Note: MDPI stays neutral with regard to jurisdictional claims in published maps and institutional affiliations. Because solvent-free methods involve bulk polymerization, the synthesized product has a higher molecular weight and stronger mechanical strength than PU produced using WPU or traditional synthesis methods. The present study aimed to synthesize a solvent-free thermoplastic PU (TPU) with mechanical properties suitable for widespread application. In the pre-experiment, three common commercial polyols, poly (butylene adipate) glycol (PBA, polyester type, Mn = 1000 g/mole), poly (tetramethylene ether) glycol (PTMG, polyether type, Mn = 1000 g/mole), and poly (hexamethylene carbonate) glycol (PHC, polycarbonate type, Mn = 1000 g/mole) were adopted to synthesize the TPU and their melt flow of index (MI) was verified and their molecular weight tested by GPC measurement (as listed in Tables S1 and S2). Will have favorable mechanical strength under room temperature andwith goodhigh flowability in Because the polymer chains have high polar attraction, the will have favorable the melted state. Whether the designed MDI-PTC-PDO has high mechanicalofproperties and low melt mechanical properties and low melt viscosity
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