Synthesis thermal performance of PBS copolyester modified with MPO

doi:10.19491/j.issn.1001-9278.2022.04.005

Abstract

Abstract:

Poly（butylene succinate）（PBS） and its copolyester with 2?methyl?1，3?propanediol （MPO）（PBMS） were synthesized through direct esterification?melt polycondensation. The chemical structure and molecular weight of the resultant PBS and its copolyester were characterized by Fourier?transform infrared spectrometry， nuclear magnetic resonance spectrometry （¹H?NMR）， and gel permeation chromatograph， and their thermal performance was valuated by differential scanning calorimetry， simultaneous thermal analyzer， and melt flow rate tester. The structural characterization results indicated that there were repeating structural units of butanediol succinate （BS） and 2?methyl?1，3?propanediol succinate （MS） in the main chains of the copolyester molecules. The content of MS was almost the same as that of MPO added in the synthetic process， confirming the successful synthesis of the PBMS copolyester according to our design strategy. The weight?average molecular weights of PBS and PBMS were determined to be 7.87×10⁴~8.75×10⁴ g/mol. Thermal analysis results indicated that the glass?transition temperature of PBMS gradually increased with an increase in the MPO content but its melting temperature decreased gradually. Moreover， the non?isothermal crystallization capability of PBMS weakened gradually and its degree of crystallinity decreased from 74.57 % to 49.42 %. The thermal degradation temperature of PBMS was higher than 400 ℃ without any change with a variation of MPO content. As the content of MPO increased， the melt index of PBMS increased gradually. Compared to pure PBS， PBMS exhibited better melt fluidity at the same temperature.

Key words: poly （butylene succinate）, 2?methyl?1，3?propanediol, synthesis, thermal property

CLC Number:

TQ323.4⁺1

JIANG Sen, WANG Liyan, CHEN Yanming, ZHANG Le, ZHAI Guifa. Synthesis thermal performance of PBS copolyester modified with MPO[J]. China Plastics, 2022, 36(4): 24-29.

Figures/Tables 10

References 15

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样品	T_g/℃	T_m/℃	T_c/℃	ΔH_m/ J•g^-1	ΔH_c/ J•g^-1	X_c/%
PBS	-38.16	118.58	68.72	82.25	64.73	74.57
PBMS⁃5%	-35.69	115.39	61.82	75.23	63.76	68.20
PBMS⁃10%	-36.92	107.91	42.48	62.90	62.13	57.03
PBMS⁃15%	-32.72	102.94	40.84	54.51	49.36	49.42

样品	T_g/℃	T_m/℃	T_c/℃	ΔH_m/ J•g^-1	ΔH_c/ J•g^-1	X_c/%
PBS	-38.16	118.58	68.72	82.25	64.73	74.57
PBMS⁃5%	-35.69	115.39	61.82	75.23	63.76	68.20
PBMS⁃10%	-36.92	107.91	42.48	62.90	62.13	57.03
PBMS⁃15%	-32.72	102.94	40.84	54.51	49.36	49.42

样品	T_onset/℃	T_max/℃	W_{700 ℃}/%
PBS	368	420	2.35
PBMS⁃5%	369	419	2.47
PBMS⁃10%	372	413	1.21
PBMS⁃15%	366	419	1.85

样品	T_onset/℃	T_max/℃	W_{700 ℃}/%
PBS	368	420	2.35
PBMS⁃5%	369	419	2.47
PBMS⁃10%	372	413	1.21
PBMS⁃15%	366	419	1.85

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