羟基保护法制备聚(D-乳酸-葡萄糖)共聚物及其性能研究

doi:10.3969/j.issn.1673-5854.2021.02.001

Abstract

Abstract:

1, 2:5,6-Di-O-isopropylidene-α-D-glucofuranose(ODG) was prepared with α-D-glucose as raw material by hydroxyl protection method. Then poly(D-lactic acid) (PDLA) coplymerized with ODG to obtain PDLAODG.Poly(D-lactic acid-co-glucose) copolymer (PDLAG) was obtainedby removing the hydroxyl protective groups of glucofuranose in PDLAODG.The structure and properties of PDLAODG and PDLAG were measured by ¹H NMR spectroscopy, Fourier transform infrared spectroscopy, thermogravimetry, differential scanning calorimetry, X-ray diffraction, contact angle and water absorptionetc. The results showed that PDLAODG and PDLAG could be prepared by hydroxyl protection methodand melt coplymerization. The number of PDLA chains linking to glucose groups could be regulated by the ratio of ODG to PDLA. when the molar ratio of ODG to PDLA ≥ 5, the copolymer only contained one D-lactic acid chain. The PDLAchains of both PDLAODG and PDLAG could form α-type crystals. With the increase of glucose group content, the melting point of PDLAODG decreased from 151.5 ℃ to 147.9 ℃, the crystallinity decreased from 58.2% to 42.1%, the water contact angle decreased from 78.1° to 71.5°, the melting point of PDLAG decreased from 156.8 ℃ to 149.4 ℃, and the crystallinity decreased from 61.9% to 50.0%, the water contact angle from 70.1° to 64.4°. The hydrophilicities of PDLAODG and PDLAG were improved compared with that of neat PDLA, while the crystallinity, melting point and hydrophilicity of PDLAG were all higher than those of PDLAODG with the same glucose group content, i.e.the thermal stability, crystallization performance and hydrophilicity of PDLAG were all improved.

Key words: glucose, poly(lactic acid), poly(D-lactic acid-glucose) copolymer, hydrophility

CLC Number:

TQ35
O63

Qianjin ZHU, Liyan QI, Dan CAO, Tingting LIU, Qinwei GAO. Preparation and Characterization of Poly(D-lactic Acid-co-Glucose) Copolymer by Hydroxyl Protection Method[J]. Biomass Chemical Engineering, 2021, 55(2): 1-8.

Figures/Tables 9

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References 24

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样品 samples	n(PDLA)∶ n(ODG)	$\overline{D_{\mathrm{P}}}$	M_n
PDLA	1∶0	31	2378
PDLAODG-1	1∶1	127	9621
PDLAODG-2	1∶2	59	4725
PDLAODG-3	1∶3	57	4581
PDLAODG-4	1∶4	60	4797
PDLAODG-5	1∶5	104	7965
PDLAG-1	1∶1	127	9557
PDLAG-2	1∶2	58	4579
PDLAG-3	1∶3	57	4519
PDLAG-4	1∶4	57	4519
PDLAG-5	1∶5	97	7315

样品 samples	熔融温度/℃ T_m	结晶度/% crystallinity
PDLA	147.7	49.7
PDLAODG-1	151.5	58.2
PDLAODG-2	151.3	56.0
PDLAODG-3	151.2	54.6
PDLAODG-4	151.1	50.0
PDLAODG-5	147.9	42.1
PDLAG-1	156.8	61.9
PDLAG-2	152.1	60.5
PDLAG-3	152.0	60.0
PDLAG-4	152.0	50.6
PDLAG-5	149.4	50.0

样品 samples	半宽高(FWHM)/° full width at half maxima	微晶尺寸/nm crystallite size	接触角/° water contact angle	吸水率/% water absorption
PDLAODG-1	0.375	222	78.1	2.7
PDLAODG-2	0.404	205	76.3	3.2
PDLAODG-3	0.412	201	75.5	4.6
PDLAODG-4	0.426	194	73.4	6.5
PDLAODG-5	0.444	185	71.5	7.2
PDLAG-1	0.352	238	70.1	4.6
PDLAG-2	0.380	219	68.2	5.3
PDLAG-3	0.392	211	67.2	5.7
PDLAG-4	0.395	210	65.1	6.6
PDLAG-5	0.443	186	64.4	7.3

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Preparation and Characterization of Poly(D-lactic Acid-co-Glucose) Copolymer by Hydroxyl Protection Method

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