Crystallization and photo‐curing kinetics of biodegradable poly(butylene succinate‐co‐butylene fumarate) short‐segmented block copolyester

Abstract

Short-segmented block copolymers of poly(butylene succinate-co-butylene fumarate) were synthesized and their crystallinity and crosslinking behavior were investigated. 1 H NMR was used to characterize the microstructure and composition of the copolyesters. Molecular weight determination was performed using gel permeation chromatography. Based on the DSC results all copolyesters were crystalline and the degree of crystallinity of the copolymers did not change with butylene fumarate mole fraction due to co-crystallization of the butylene succinate and butylene fumarate groups. Crosslinked copolyesters showed a lower crystallization rate and degree of crystallinity while the crystallization temperature shifted to higher temperatures compared with uncrosslinked copolyesters due to the formation of nucleating agents by crosslinkages. Photo-DSC was used to investigate the crosslinking kinetics for UV-initiated photo-curing. Three kinetics parameters including the rate constant (k) and the orders of the initiation and propagation reactions (m and n, respectively) were determined for the quenched and unquenched copolymers.

Biodegradable Poly(butylene succinate) Copolyesters Modified by Bioresoured 2,5-Tetrahydrofurandimethanol

“…The chemical structures of synthetic copolyesters were investigated by 1 H NMR spectroscopy. The characterization peaks of PBTS-46 were clearly assigned to the spectrum presented in Figure (a), and the chemical structures of the homopolyesters were confirmed . In addition, the characterization peaks of C H 2 (b) and C H 2 (e) adjacent to the ester group overlapped with the peaks of C H (c) in THFDM (the chemical shift ranged from 3.90 to 4.26 ppm).…”

“…The characterization peaks of PBTS-46 were clearly assigned to the spectrum presented in Figure 1(a), and the chemical structures of the homopolyesters were confirmed. 31 In addition, the characterization peaks of CH 2 (b) and CH 2 (e) adjacent to the ester group overlapped with the peaks of CH (c) in THFDM (the chemical shift ranged from 3.90 to 4.26 ppm). The peaks of CH 2 (d+d′) in THFDM overlapped with the peaks of CH 2 (f) in BDO (the chemical shift ranged from 1.60 to 1.80 ppm).…”

In-Situ Preparation of Poly(butylene succinate-co-butylene fumarate)/Hydroxyapatite Nanocomposite

“…The intrinsic viscosity and molecular weight of the samples have been listed in Table . Our previous study showed that incorporating 20 mol % of BF results in optimum tensile and degradability properties . The polycondensation time decrease up to 10 min with the presence of nHA in the reactor due to the catalytic effect of the calcium element of the nanohydroxyapatite structure. , …”

“…So far, several unsaturated aliphatic comonomers such as fumaric acid, maleic acid, itaconic acid, , and ricinoleic acid have been used to synthesize PBS copolyester. We have recently synthesized poly­(butylene succinate- co -butylene fumarate) short-segmented block copolyester via the three-step polycondensation method . Besides copolymerization, the in situ process of synthesizing nanocomposites will lead to a higher dispersion of inorganic filler in the organic matrix, resulting in enhanced mechanical properties required in many medical applications. , Different organic and inorganic nanoparticles have been used to in situ polymerize PBS nanocomposite including silica, titanium oxide, graphene oxide, organo-montmorillonite, and a novel organo-modified layered double hydroxide .…”

Proton exchange membranes based on sulfonated polybutylene fumarate: Preparation and characterization

“…PBF was synthesized by the method described in the literature. 27,32,33 Briefly, in the first step, 1 mol fumaric acid was mixed with 1.7 mol 1,4-butanediol at 195 C and 3.5 bar pressure for 1 h to complete the esterification process. In the second step, hydroquinone as an inhibitor and titanium butoxide as a catalyst were added to the reactor for the polycondensation step.…”