UV Aging Characterization of Paraloid Acrylic Polymers for Art Conservation by Infrared Spectroscopy

Xin GONG; Xiang-na HAN; Kun-long CHEN

doi:10.3964/j.issn.1000-0593(2022)07-2175-06

Journals >Spectroscopy and Spectral Analysis >Volume 42 >Issue 7 >Page 2175 > Article

Spectroscopy and Spectral Analysis
Vol. 42, Issue 7, 2175 (2022)

UV Aging Characterization of Paraloid Acrylic Polymers for Art Conservation by Infrared Spectroscopy

Xin GONG^{1; 2;}, Xiang-na HAN^{1; *;}, and Kun-long CHEN^1;

Author Affiliations

1. Institute of Cultural Heritage and History of Science & Technology, University of Science and Technology Beijing, Beijing 100083, China

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DOI: 10.3964/j.issn.1000-0593(2022)07-2175-06 Cite this Article

Xin GONG, Xiang-na HAN, Kun-long CHEN. UV Aging Characterization of Paraloid Acrylic Polymers for Art Conservation by Infrared Spectroscopy[J]. Spectroscopy and Spectral Analysis, 2022, 42(7): 2175 Copy Citation Text

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Fig. 1. Color change and glossiness at 20 degrees of the Paraloid products during UV aging test

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Fig. 2. FTIR spectra during UV aging test of Paraloid B-44

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Fig. 3. FTIR spectra during UV aging test of Paraloid B-48N

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Fig. 4. FTIR spectra during UV aging test of Paraloid B-67

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Fig. 5. FTIR spectra during UV aging test of Paraloid B-72

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Paraloid	T_g /℃	单体组成^b	分子量(M_w)	pH	体积密度25 ℃ /(lb·gal^-1)	努氏硬度 /KHN	粘度25 ℃ /Cp
B-44	60	MMA/EA	140 000	1~2	9.4	15~16	1 500
B-48N	50	MMA/BMA	250 000	10~12	9.1	11~12	8 500
B-67	50	iBMA	60 000	3~4	7.3	11~12	1 500
B-72	40	EMA /MA	105 000	3~4	9.6	10~11	4 000

Table 1. Basic information of the Paraloid products^a

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材料名称	羰基指数(CI)
材料名称	0 h	336 h	1 680 h	2 352 h	3 864 h
B-44	3.42	3.19	3.175	3.123	3.189
B-48N	3.382	3.386	2.866	3.132	3.209
B-67	2.921	2.862	2.81	2.713	2.818
B-72	4.094	3.558	3.53	3.603	3.335

Table 2. Carbonyl index (CI) of the Paraloid products at different UV irradiation time

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材料名称	C=O (1 721~1 723 cm^-1) 红外吸收强度(D_t/%)
材料名称	0	336 h	1 680 h	2 352 h	3 864 h
B-44	0.00	-29.69	-30.86	-37.41	-36.97
B-48N	0.00	-19.58	-26.54	-27.18	-32.20
B-67	0.00	-12.11	-42.19	-51.37	-51.95
B-72	0.00	-7.75	1.59	-10.54	-5.96

Table 3. The change of infrared absorption intensity (D_t) of carbonyl group at different UV irradiation time (t)

Xin GONG, Xiang-na HAN, Kun-long CHEN. UV Aging Characterization of Paraloid Acrylic Polymers for Art Conservation by Infrared Spectroscopy[J]. Spectroscopy and Spectral Analysis, 2022, 42(7): 2175

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