Synthesis and Properties of Ultraviolet-Irradiation Resistant Carbon Dioxide Copolymer

doi:10.11944/j.issn.1000-0518.2019.11.190210

Chinese Journal of Applied Chemistry ›› 2019, Vol. 36 ›› Issue (11): 1248-1256.DOI: 10.11944/j.issn.1000-0518.2019.11.190210

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Synthesis and Properties of Ultraviolet-Irradiation Resistant Carbon Dioxide Copolymer

CAI Yi^a^b,GUO Hongchen^a^b,CAO Han^c,GAO Fengxiang^a,ZHOU Qinghai^a,WANG Xianhong^a^b^*()

a Key Laboratory of Polymer Ecomaterials,Changchun Institute of Applied Chemistry,Chinese Acdemy of Sciences,Changchun 130022,China
b University of Chinese Academy of Sciences,Beijing 100049,China
c University of Science and Technology of China,Hefei 230026,China

Received:2019-07-15 Accepted:2019-09-10 Published:2019-11-01 Online:2019-11-05
Contact: WANG Xianhong
Supported by:
Supported by the Science and Technology Service Network Initiative of Chinese Academy of Sciences(STS)(No.KFJ-STS-QYZD-047)

Abstract

Abstract:

CO₂ based plastics (PPC) is a high molecular mass copolymer of carbon dioxide and propylene oxide. PPC is quite sensitive to ultraviolet (UV) irradiation and its molecular mass decreases quickly with UV-irradiation accompanied by significant loss of mechanical strength. To improve the UV irradiation resistance of PPC is of key importance for its application as agricultural mulching film, which is always under UV irradiation during the whole coverage. In this work, an epoxide with UV absorber function, i.e., 2-hydroxy-4(2,3-epoxypropoxy)benzophenone (HEB), was designed and prepared. By means of terpolymerization of CO₂, propylene oxide and HEB, terpolymer PPCH with UV absorber side chain was successfully synthesized, where the chemical structure as well as the HEB content was determined by ¹H NMR spectroscopy. Under the premise of ensuring PPCH molecular mass not less than 5.0×10⁴, the maximum molar fraction of HEB incorporated into the PPCH terpolymer was 0.32%, and such PPCH showed a tensile strength of 30.97 MPa, a glass transition temperature (T_g) of 26.7 ℃, and the temperature at 5% mass loss of thermal decomposition (T_d-5%) of 216.9 ℃. When PPC was exposed under UV irradiation for 240 h, its number-average molecular mass decreased by 67.8%, accompanied by 10.1% loss of tensile strength and 40.1% loss of elongation at break. As a comparison, the number-average molecular mass of PPCH with 0.06% molar fraction HEB showed only 6.2% decrease correspondingly. It showed 1.7% loss of tensile strength and 13.3% decrease of elongation at break, indicating that PPCH had improved UV-irradiation resistance performance due to the existence of UV absorbable functional group like HEB. PPCH and PPC blended with similar 2,4-dihydroxyl benzophenone (BP) content were compared for hot water (50 ℃) extraction test. No BP was extracted in PPCH providing stable UV absorption performance, while the PPC/BP blend showed sharp drop in UV absorption upon hot water extraction. Therefore, terpolymerization of CO₂, propylene oxide with UV absorbable monomer is an effective way to improve the UV irradiation resistance performance of CO₂ copolymer.

Key words: carbon dioxide, carbon dioxide copolymer, terpolymerization, ultraviolet irradiation resistance, mechanical performance

CAI Yi,GUO Hongchen,CAO Han,GAO Fengxiang,ZHOU Qinghai,WANG Xianhong. Synthesis and Properties of Ultraviolet-Irradiation Resistant Carbon Dioxide Copolymer[J]. Chinese Journal of Applied Chemistry, 2019, 36(11): 1248-1256.

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Synthesis and Properties of Ultraviolet-Irradiation Resistant Carbon Dioxide Copolymer

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