Intrinsic viscosity–number average molecular weight relationship for poly(1,4‐butylene adipate) diol

Abstract

ABSTRACT:The relationship between number average molecular weight (M n ) and intrinsic viscosity ([g]) was studied for poly(1,4-butylene adipate) diol (PBAD) in tetrahydrofuran, toluene, and ethyl acetate at 25 C. Thus, a series of PBAD samples were prepared by polymerization between 1,6-adipic acid and 1,4-butanediol. The values of M n for the samples were determined by end-group analysis as well as by ebulliometry, and the average difference of M n between the two analysis ways was about 2.69%. The Mark-Houwink-Sakurada equations for PBAD were obtained to relate [g] with M n in the range of 1900-10,000.

Synthesis and properties of novel poly(ethylene succinate-co-decamethylene succinate) copolymers

“…Recently, more and more researchers have focused on the fundamental study and practical application of some aliphatic polyesters, such as poly(butylene succinate) (PBS), poly(ethylene adipate) (PEA), poly(butylene adipate) (PBA), poly(ethylene succinate) (PES), and so on. [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15] Among these aliphatic polyesters, PES is regarded as one of the most promising polyesters due to its excellent biocompatibility, favorable biodegradability, thermal stability, relatively high melting temperature, and environment-friendly properties. The synthesis and physical properties of PES have been extensively investigated.…”

Intrinsic Viscosity-molecular Weight Relationship of Poly (Hexanediol Adipate)

“…The acid value (A v ) is defined as the mass (mg) of potassium hydroxide consumed to neutralize the carboxyl groups per gram of sample. The operation procedure of the measurement process is the same as the literature [10,11] and described briefly as follows: the PHA was first dissolved in 30 ml of toluene-ethanol ( 2:1 V/V) mixed solution, followed by titration with 0.1 mol/L standard KOH-ethanol solution against phenolphthalein indicator. The volume of the KOH-ethanol solution consumed was recorded.…”

“…The hydroxyl value of PHA is determined by acetic anhydrideperchloric acid method [10,11]. The hydroxyl group in the sample is acylated with acetic anhydride, and the excess acetic anhydride is hydrolyzed to acetic acid, and the acetic acid is titrated with KOH-ethanol solution.…”

Solution viscosity – molar mass relationships for poly(butylene succinate) and discussion on molar mass analysis

“…I H5 is the integral of trifluoroacetylated PBS hydroxyl end-groups at 4.4 ppm (-CH 2 OCOCF 3 ) and (I PBS is the sum of the integrals from all monomer units in the chains of PBS (Equation (12)): (12) where I H1 is the integral at 2.6 ppm, referring to the methylene groups of succinic acid units in PBS and the peak at 4.2 ppm, referring to butanediol units in PBS. N HC , N CC data and the resulting molar masses of the PBS series are detailed in Table 2.…”

“…In general, ignoring dispersity effects [12][13][14]. For poly(butylene succinate) k and a parameters are poorly defined in the literature [15][16][17].…”