Epitaxial crystallization of olefin block copolymers (OBCs) on uniaxially oriented isotactic polypropylene and high-density polyethylene films
Epitaxial crystallization of olefin block copolymers (OBCs) on uniaxially oriented isotactic polypropylene and high-density polyethylene films
复制标题
烯烃嵌段共聚物 (OBC) 在单轴取向等规聚丙烯和高密度聚乙烯薄膜上的外延结晶
DOI：
10.1016/j.polymer.2011.11.062
复制
发表时间：
2012-01
期刊：
影响因子：
4.6
通讯作者：
, Gary
中科院分区：
文献类型：
--
作者：
Loos, Joachim;Zhou, Yong;Liu, Guoming;Wang, Fosong;Zhang, Xiuqin;Wang, Dujin;Chen, Hongyu;Walton, Kim;March;, Gary
用透射电镜（TEM）研究了烯烃嵌段共聚物（OBCs）在单轴取向等规聚丙烯（iPP）和高密度聚乙烯（HDPE）薄膜上的外延结晶行为。所研究的OBC的可结晶块在iPP和HDPE衬底上均外延成核，并观察到OBC片的外延生长。在熔体的慢速和快速冷却条件下发现了OBCs的外延结晶，这表明聚烯烃衬底与OBCs之间存在强烈的相互作用。然而，OBC的外延形貌在很大程度上取决于其可结晶和不可结晶块之间的辛烯浓度差（ΔC8），这可能与OBC在熔体中的偏析强度有关。在高ΔC8the的情况下，OBC外延结晶的发展被限制在被非晶相包围的孤立晶域内。相比之下，低ΔC8the取向的OBC片层在iPP上均匀分布，但在HDPE上形成了分离的晶域，HDPE分子结构相似，在OBC晶块上具有比iPP更强的成核能力。我们的研究指出外延是OBC与聚烯烃之间强相互作用的另一个原因，这使得OBC与常规无规共聚物相比具有更先进的相容行为。
The epitaxial crystallization behavior of olefin block copolymers (OBCs) on uniaxially oriented isotactic polypropylene (iPP) and high-density polyethylene (HDPE) films has been investigated by transmission electron microscopy (TEM). The crystallizable blocks of the OBCs under investigation were epitaxially nucleated by both iPP and HDPE substrates and epitaxial growth of OBC lamellae was observed. Epitaxial crystallization of the OBCs has been found for slow and fast cooling conditions from the melt which pointed to the strong interaction between the polyolefin substrates and the OBCs. However, the epitaxial morphology of the OBCs strongly depends on their octene concentration difference (ΔC8) between crystallizable and non-crystallizable blocks, which probably is related to the OBC segregation strength in the melt. With high ΔC8the development of epitaxial crystallization of the OBC was restricted within isolated crystalline domains surrounded by the amorphous phase. In contrast, with low ΔC8the oriented lamellae of the OBC were distributed homogeneously on iPP but formed separated crystalline domains on HDPE, which has a stronger nucleation capability than iPP on the crystalline OBC blocks because of its similar molecular architecture. Our study points to epitaxy as another reason for the strong interaction between OBC and polyolefins which causes the advanced compatibilization behavior of OBCs when compared with conventional random copolymers.
登录
查看更多内容
影响因子：
4.5
作者：
J. Loos;F. Katzenberg;J. Petermann
通讯作者：
J. Loos;F. Katzenberg;J. Petermann
DOI：
10.1002/pol.1985.180230822
发表时间：
1985-08
期刊：
Journal of Polymer Science Part B
影响因子：
--
作者：
R. M. Gohil
通讯作者：
R. M. Gohil
聚丙烯与统计和嵌段乙烯-辛烯共聚物二元共混物的形态和机械性能
影响因子：
3
作者：
Liu, Guoming;Zhang, Xiuqin;Liu, Chenyang;Chen, Hongyu;Walton, Kim;Wang, Dujin
通讯作者：
Wang, Dujin
DOI：
10.1002/(sici)1099-0488(19970715)35:9
发表时间：
1997-07
期刊：
Journal of Polymer Science Part B
影响因子：
--
作者：
Shouke Yan;J. Petermann;Decai Yang
通讯作者：
Shouke Yan;J. Petermann;Decai Yang
影响因子：
3.2
作者：
H. Kestenbach;J. Loos;J. Petermann
通讯作者：
H. Kestenbach;J. Loos;J. Petermann