Supercooling-dependent morphology evolution of an organic nucleating agent in poly(L-lactide)/poly(D-lactide) blends
Supercooling-dependent morphology evolution of an organic nucleating agent in poly(L-lactide)/poly(D-lactide) blends
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聚（L-丙交酯）/聚（D-丙交酯）共混物中有机成核剂的过冷依赖性形态演化
DOI：
10.1039/c7ce00093f
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发表时间：
2017-03
期刊：
影响因子：
3.1
通讯作者：
Yang Ming-Bo
中科院分区：
文献类型：
--
作者：
Shen Sen-Qi;Bao Rui-Ying;Liu Zheng-Ying;Yang Wei;Xie Bang-Hu;Yang Ming-Bo
The morphology evolution of an organic nucleating agent (NA) in poly(L-lactide)/poly(D-lactide) (PLLA/PDLA) blends was investigated under a series of multi-step isothermal and nonisothermal processes at identical NA solubility achieved via the same NA concentration and final molten temperature of heating (Tf). It was found that the morphology of NA frameworks depended on the supercooling determined by the recrystallization temperature of the NA in the polymer melt, except for NA solubility. When the NA partly dissolved in the matrix, the residuum of the original flat-plate NA acting as a nucleus induced recrystallization at a low degree of supercooling, and small sheet-like NA particles formed in the melt. When the NA dissolved in the matrix absolutely, NA aggregation increased in the melt due to the low nucleation density of the NA itself. The shape of the NA aggregation depended on the recrystallization temperature. With the increase in the supercooling, the large aggregated sheet-like NA transformed into a dendritic-like framework accompanied by a decrease in the stem size of the NA frameworks. Moreover, the stereocomplex efficiency of the blend was influenced by the effective nucleation surface induced by the shape of the NA aggregation. For PLLA/PDLA blends with 1.0 wt% NA, the crystallization half time (t1/2) of stereocomplex (sc) crystallites at the crystallization temperature of 180 °C is as long as 79.8 min for the sample with a large aggregated sheet-like NA, with 1 order of magnitude reduction for that with a dendritic-like NA framework, leading to a t1/2 of 7.9 min. The morphological control of NA frameworks is of great significance to guide the formation of various crystal morphologies of sc crystallites. The established relationship between the self-assembled morphology of NA and NA concentration, NA solubility and supercooling affords guidance in practical processing to control the crystal morphology and polymorphic crystalline morphology of PLLA/PDLA blends via tuning the crystal morphology of NA in the polymer matrix.
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影响因子：
3.4
作者：
Zhiqiang Wu;Gang Wang;Mengwei Zhang;Ke Wang;Q. Fu
通讯作者：
Zhiqiang Wu;Gang Wang;Mengwei Zhang;Ke Wang;Q. Fu
碳纳米管接枝聚（L-丙交酯）-嵌段聚（D-丙交酯）在聚（L-乳酸）/聚（D-乳酸）共混物结晶中的作用：抑制同晶化和增强立构复合物结晶
影响因子：
6
作者：
Cao Zhi-Qiang;Sun Xiao-Rong;Bao Rui-Ying;Yang Wei;Xie Bang-Hu;Yang Ming-Bo
通讯作者：
Yang Ming-Bo
影响因子：
11.2
作者：
T. Quynh;H. Mitomo;Long Zhao;S. Asai
通讯作者：
T. Quynh;H. Mitomo;Long Zhao;S. Asai
外消旋聚（L-丙交酯）/聚（D-丙交酯）共混物的多晶型：熔融和冷结晶的影响
影响因子：
3.3
作者：
Bao, Rui-Ying;Yang, Wei;Yang, Ming-Bo
通讯作者：
Yang, Ming-Bo
通过同晶熔融重结晶在对映体聚丙交酯中形成立体络合物：结晶动力学和晶体形态
影响因子：
5.5
作者：
Na, Bing;Zhu, Jie;Chen, Bibo
通讯作者：
Chen, Bibo