Mechanical Properties of Gradient Copolymers of Styrene and n-Butyl Acrylate
Mechanical Properties of Gradient Copolymers of Styrene and n-Butyl Acrylate
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苯乙烯与丙烯酸正丁酯梯度共聚物的力学性能
DOI：
10.1002/polb.23709
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发表时间：
2015-06-15
影响因子：
--
通讯作者：
Luo, Yingwu
中科院分区：
文献类型：
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作者：
Guo, Yunlong;Gao, Xiang;Luo, Yingwu
研究了苯乙烯质量分数为55wt%左右的线型和V型组成的苯乙烯-丙烯酸丁酯共聚物的力学性能，并与嵌段共聚物进行了比较。与嵌段共聚物相比，梯度共聚物具有更低的弹性模量、更大的断裂伸长率和相似的室温极限拉伸强度。这一性能可以归因于梯度共聚物中的局部弹性模量从最硬的纳米微区不断变化到最软的纳米微区，从而缓解了拉伸试验过程中的应力集中。与V型梯度(VG)共聚物相比，线性梯度共聚物具有更高的弹性模量和更低的断裂伸长率。随着恢复温度从10℃升高到60℃，VG共聚物的应变恢复率从40%稳定地变化到99%。然而，线型和三嵌段共聚物的弹性恢复即使在60摄氏度也很差。科学，B部分：多晶硅。太棒了。2015年，53,860-868
The mechanical properties of linear and V-shaped compositional gradient copolymer of styrene and n-butyl acrylate with composition of around 55 wt % styrene were investigated by comparing with their block copolymer counterparts. Compared with their block copolymer counterparts, the gradient copolymers showed lower elastic modulus, much larger elongation at break, and similar ultimate tensile strength at room temperature. This performance could be ascribed to that the local moduli continuously change from the hardest nanodomains to the softest nanodomains in the gradient copolymer, which alleviates the stress concentration during tensile test. Compared with the V-shaped gradient (VG) copolymer, the linear gradient copolymer showed much higher elastic modulus but lower elongation at break. The mechanical properties of the gradient copolymers were more sensitive to the change in temperature from 9 degrees C to 75 degrees C. With recovery temperature increased from 10 degrees C to 60 degrees C, the strain recovery of VG copolymer would change steadily from 40% to 99%. However, the elastic recovery of linear and triblock copolymer was poor even at 60 degrees C. (c) 2015 Wiley Periodicals, Inc. J. Polym. Sci., Part B: Polym. Phys. 2015, 53, 860-868