Synthesis of Thermoplastic Polyurethanes Containing Bio-Based Polyester Polyol and Their Fiber Property

Abstract

Among the starting materials of thermoplastic polyurethanes (TPUs), it was confirmed that succinic acid-based polyester biopolyols having different molecular weights (Mn = 1000, 2000, and 4000) affect the physicochemical properties of the final polymer significantly. Bio-TPUs synthesized through a solvent-free one-shot polymerization process were synthesized with a polyester polyol, 1,4 butanediol (BDO), and 4,4′-methylene diphenyl diisocyanate (MDI) in a molar ratio of 1:1:2. As a control group, one typical petroleum-based TPU was synthesized and characterized along with other bio-based TPUs. Representative petroleum-based and bio-based TPUs synthesized were manufactured as monofilaments with a diameter of about 0.2 mm through an extrusion process with different draw ratios (4, 5, and 6 times). The molecular weight and structural properties of the TPUs were characterized by GPC and FT-IR analysis and thermal characterization by DSC and TGA analysis. Petroleum-based TPU and bio-based TPU having the same molecular weight soft segment (SS) tended to have similar molecular weight and hard segment (HS) content. TPUs with high HS content had excellent thermal stability, enabling stable extrusion of TPUs. In addition, it was confirmed that the bio-based TPU fibers produced in this way had a tensile strength corresponding to the physical properties of petroleum-based TPU fibers and an excellent elastic recovery rate of almost 100 %. These results indicate the application potential of bio-TPU.

Sustainable Coating Based on Zwitterionic Functionalized Polyurushiol with Antifouling and Antibacterial Properties

“…Additionally, NCO peaks were observed around 2270 cm −1 in the PHDE spectrum, albeit with reduced intensity compared to HMDI, indicating a reaction between a few NCO groups in HMDI and DMEA. However, the characteristic NCO peaks disappeared in the FTIR spectrum of HUDM, suggesting the reaction of the remaining isocyanate groups in HMDI with urushiol [28]. Furthermore, a series of characteristic absorption peaks corresponding to the phenolic amide ester linkages were observed, confirming the successful coupling of NCO and OH groups.…”

Preparation of Side-By-Side Bicomponent Fibers Using Bio Polyol Based Thermoplastic Polyurethane (TPU) and TPU/Polylactic Acid Blends

“…Gel permeation chromatography (GPC) analysis was performed through Ecosec GPC (Tosoh Company, Tokyo, Japan) to measure the number average molecular weight (M n ), weight average molecular weight (M w ), and polydispersity index (PDI) of the TPU samples. The sample solution for analysis was prepared by adding 50 mg of dried polymer to 5 mL of inhibitor-free tetrahydrofuran solution, completely dissolving it at room temperature for one day, and then filtering it with a 0.45 µm PTFE filter [35]. The HS content of the TPU samples was calculated as a percentage of the mass of the chain extender and isocyanate making up the HS out of the total mass of all starting materials [36].…”

Advancements in polyurethane coating: Synthesis and characterization of a novel hyper branched polyester polyol

“…Various new methods have been developed for synthesizing different types of polyester polyols with unique structures. These include Jatropha-Oil-Based Polyester Polyol 33 , Polyester Polyol from Cyclohexanone plant wash water 34 , isosorbide-based polyester polyols 35 , polyester polyol from Direct conversion of waste polyesters 36 , polyester polyol based on epoxidized soybean oil 37 , and other works reported in the literature [38][39][40] . Recent investigations on polyurethane have revealed that vegetable oil fatty acids can serve as a suitable replacement for petroleum-based raw materials [41][42][43] .…”