Quantitative contribution of each component to secondary nucleation in the blends of homopolymer and its random copolymers
Quantitative contribution of each component to secondary nucleation in the blends of homopolymer and its random copolymers
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均聚物及其无规共聚物共混物中各组分对二次成核的定量贡献
DOI：
10.1016/j.polymer.2022.124735
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发表时间：
2022-03
期刊：
影响因子：
4.6
通讯作者：
Jun Xu
中科院分区：
文献类型：
--
作者：
Shujing Zhang;Tianyu Wu;Zhiqi Wang;Jiarui Han;Baohua Guo;Jun Xu
在均聚物/无规共聚物共混物中，这两种可结晶组分如何促进球晶的二次成核和径向生长速率仍不清楚。在均聚物和低含量无定形共聚单体的无规共聚物的共混物中，存在两种高度可能的成核途径。第一，类似于制度II，球晶生长rateG的共混物是由二次成核和三级成核，前者由均聚物和后者由无规共聚物贡献的影响。另一种是与体系Ⅰ和体系Ⅲ相似的，共混物的生长速率G主要由均聚物和无规共聚物的二次成核作用决定。对于这两种情况，定量方程建立相关的球晶径向生长速率与体积分数的均聚物和可结晶的重复单元的无规共聚物中的体积百分比。通过对聚丁二酸丁二醇酯/聚丁二酸丁二醇酯-co-2-甲基丁二酸丁二醇酯共混物球晶径向生长速率的分析，揭示了共混物中均聚物和无规共聚物链成核的微观机理。拟合的实验结果与理论方程排除了第一制度II一样的可能性，即均聚物和无规共聚物有助于二级成核和三级成核，分别。结果表明，均聚物和无规共聚物有助于在共混物中的二次成核。也就是说，共混物的临界次级核由来自均聚物和无规共聚物链的可结晶单元组成。均聚物含量越高，临界核中衍生自均聚物的可结晶单元越多。相反，当无规共聚物中的可结晶单元的浓度变大时，临界核中更多的可结晶单元来自无规共聚物。结合理论和实验，我们可以确定在共混物中的每个可结晶组分的二次成核的定量贡献。
In homopolymer/random copolymer blends, it is still unclear how the two crystallizable components contribute to secondary nucleation and the radial growth rate of spherulites. There are two highly possible nucleation pathways in the blends of homopolymer and the random copolymer with a low content of amorphous co-monomers. One, similar to regime II, the spherulitic growth rateGof the blends is affected by both secondary nucleation and tertiary nucleation, with the former contributed by homopolymers and the latter by random copolymers. The other, similar to regime I and III, the growth rateGof the blends is mainly determined by secondary nucleation, which is involved by both homopolymer and random copolymer. For the two cases, quantitative equations are established to correlate the spherulitic radial growth rate with the volume fraction of the homopolymer and the volume percentage of the crystallizable repeating units in the random copolymer. By analyzing the radial growth rate of the spherulites of poly(butylene succinate)/poly(butylene succinate-co-butylene 2-methylsuccinate) blends, we reveal the microscopic mechanism for the nucleation of homopolymer and random copolymer chains in the blends. Fitting of the experimental results with the theoretical equations precludes the first regime II like possibility that the homopolymer and the random copolymer contribute to secondary nucleation and tertiary nucleation, respectively. It is shown that both the homopolymer and the random copolymer contribute to secondary nucleation in the blends. Namely, a critical secondary nucleus of the blends consists of the crystallizable units from both homopolymer and random copolymer chains. The higher the homopolymer content, the more crystallizable units in a critical nucleus are derived from the homopolymer. In contrast, when the concentration of crystallizable units in the random copolymer becomes larger, more crystallizable units in a critical nucleus come from the random copolymer. Combining theory and experiments, we could determine the quantitative contribution of each crystallizable component to the secondary nucleation in the blends.
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影响因子：
2.7
作者：
Jun Xu;Günter Reiter;Rufina Alamo
通讯作者：
Rufina Alamo
影响因子：
5.5
作者：
CLARK, EJ;HOFFMAN, JD
通讯作者：
HOFFMAN, JD
层状聚合物晶体横向生长前沿二次核临界尺寸的测定
影响因子：
5.5
作者：
Zhang Shujing;Han Jiarui;Gao Yang;Guo Baohua;Reiter Guenter;Xu Jun
通讯作者：
Xu Jun
DOI：
10.1002/polb.1986.090240212
发表时间：
1986-02
期刊：
Journal of Polymer Science Part B
影响因子：
--
作者：
J. Point;M. Colet;M. Dosière
通讯作者：
J. Point;M. Colet;M. Dosière
影响因子：
5.5
作者：
J. Hoffman;Robert L. Miller
通讯作者：
J. Hoffman;Robert L. Miller