期刊
ACS APPLIED POLYMER MATERIALS
卷 4, 期 11, 页码 8303-8314出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsapm.2c01277
关键词
phenolic foams; triethylene glycol; in situ polymerization process; prepolymerization process; toughness
资金
- Special project for the transformation of major scientific and technological achieve-ments in Shenyang [20-203-5-01]
- Ministry of Education and Science of Russian Federation [11.9505.2017/8.9]
- Department of Science and Technology of Liaoning Province [2017304004]
This study investigates the toughening effect of in situ polymerization modification process (In-MP) and prepolymerization modification process (Pre-MP) on triethylene glycol (TEG)-modified phenolic foams (PFs). The results show that TEG prepolymerization-modified phenolic resin (T-Pre-PR) with uniform molecular weight distribution and improved resin properties is more suitable for internal toughening modification of PFs than TEG in situ polymerization-modified phenolic resin (T-In-PR).
The current work presents the study of the toughening effect of in situ polymerization modification process (In-MP) and prepolymerization modification process (Pre-MP) on triethylene glycol (TEG)-modified phenolic foams (PFs). TEG in situ polymerization-modified phenolic resin (T-In-PR) and TEG prepolymerization-modified phenolic resin (T-Pre-PR) with differ-ent molecular structures have been synthesized by two processes using TEG as a modifier. The comparison of the molecular structure and properties of the resins shows that the molecular weight distribution of T-Pre-PR is uniform and its basic properties of resin are better than T-In-PR. The number of benzene ring linkage bridges in the T-Pre-PR structure increases from three to four, which can improve the toughness while stabilizing the intermolecular connection strength. The TEG-modified PFs prepared with TEG-modified phenolic resins exhibit excellent toughness. The fracture displacement of T-Pre-PF was 85.13% higher than those of ordinary PFs, and the pulverization rate was 55.85% lower than those of ordinary PFs. Compared with T-In-PF, the cell shapes of T-Pre-PF were uniform polygonal structures and formed a stable honeycomb-like structure. The cell size distribution of T-Pre-PF was more concentrated than those of T-In-PF and ordinary PFs, and the level of damage of cell wall was low. The maximum bending strength of T-Pre-PF was 0.263 MPa, and the maximum compression strength was 0.160 MPa, which were higher than those of T-In-PF. The findings demonstrate that Pre-MP is more suitable for the preparation of PFs with internal toughening modification by TEG than In-MP.
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