Self-assembly of linear-hyperbranched hybrid block polymers: crystallization-driven or solvent-driven?
Self-assembly of linear-hyperbranched hybrid block polymers: crystallization-driven or solvent-driven?
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DOI：
10.1007/s10965-019-1786-5
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发表时间：
2019-05-01
影响因子：
2.8
通讯作者：
Mu, Jingshan
中科院分区：
文献类型：
--
作者：
Ding, Linfeng;Qian, Jianyong;Mu, Jingshan
用透射电镜、扫描电镜和原子力显微镜研究了聚乙烯-嵌段-超支化聚缩水甘油二嵌段聚合物（PE 1-b-hbPG（7）-OH 8和PE 1-b-hbPG（26）-OH 27）在选择性、弱选择性和非选择性溶剂中的自组装行为。研究表明，在甲苯溶剂中，两种聚合物均能在PE结晶的驱动下组装成菱形层状结构，由聚乙烯单晶层夹在两个hbPG层之间构成，hbPG层分别连接在上下基底表面。而将聚合物的甲苯溶液加入到THF和MeOH中，聚集体的形态由片状变为棒状或球状，表明聚乙烯嵌段结晶的驱动力改变为hbPG嵌段与溶剂之间的相互作用参数（）。此外，hbPG链段的聚合度（DP）影响层状结构的厚度（在甲苯中）和棒状或球形聚集体的形状和大小（在混合溶剂中），由PE和hbPG链在选择性溶剂中的相对体积分数确定。
Self-assembly of polyethylene-block-hyperbranched polyglycidol diblock polymers (PE1-b-hbPG(7)-OH8 and PE1-b-hbPG(26)-OH27) in selective or slightly selective or nonselective solvents of PE segments were investigated by microscopy (TEM, SEM and AFM). Study showed that both polymers can be assembled into a diamond-shaped lamellae driving by PE crystallization in toluene solvent, composed of PE single-crystal layer sandwiched between two hbPG layers tethered on the top and bottom basal surfaces. However, by adding the toluene solution of polymers to THF and MeOH, the morphology of the aggregate changed from lamellae to rod or sphere, indicating the change of driving force from the crystallization of PE block to the interaction parameter () between hbPG block and solvent. In addition, the degree of polymerization (DP) of hbPG segments affected the thickness of the lamellae (in toluene) and the shape and size of the rodlike or spherical aggregate (in mixed solvent), determined by the relative volume fractions of PE and hbPG chains in selective solvents.