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1-丁烯/4-(3-丁烯基)甲苯共聚物结晶的熔体记忆效应
Melt Memory Effect in Crystallization of 1-Butene/4-(3-Butenyl)toluene Copolymers
- 高分子学报 2022年53卷第12期 页码：1534-1542
- 作者机构：
天津大学材料科学与工程学院 天津 300350
- 作者简介：
E-mail: zhe.ma@tju.edu.cn
- 基金信息：国家自然科学基金(基金号 51873151)
DOI：10.11777/j.issn1000-3304.2022.22204
中图分类号：纸质出版日期：2022-12-20，
网络出版日期：2022-08-31，
收稿日期：2022-05-26，
录用日期：2022-05-31
- 稿件说明：
移动端阅览
王元元,曲春静,马哲.1-丁烯/4-(3-丁烯基)甲苯共聚物结晶的熔体记忆效应[J].高分子学报,2022,53(12):1534-1542.
Wang Yuan-yuan,Qv Chun-jing,Ma Zhe.Melt Memory Effect in Crystallization of 1-Butene/4-(3-Butenyl)toluene Copolymers[J].ACTA POLYMERICA SINICA,2022,53(12):1534-1542.
王元元,曲春静,马哲.1-丁烯/4-(3-丁烯基)甲苯共聚物结晶的熔体记忆效应[J].高分子学报,2022,53(12):1534-1542. DOI： 10.11777/j.issn1000-3304.2022.22204.
Wang Yuan-yuan,Qv Chun-jing,Ma Zhe.Melt Memory Effect in Crystallization of 1-Butene/4-(3-Butenyl)toluene Copolymers[J].ACTA POLYMERICA SINICA,2022,53(12):1534-1542. DOI： 10.11777/j.issn1000-3304.2022.22204.
摘要
利用二甲基吡啶胺铪/有机硼催化体系，合成了一系列1-丁烯/4-(3-丁烯基)甲苯(PBBT)共聚物，在聚1-丁烯链中引入了具有
π
-
π
作用的结构单元. 利用示差扫描量热法系统研究了熔融热处理温度、熔融热处理时间和结晶温度对PBBT共聚物熔体记忆效应的影响，发现4-(3-丁烯基)甲苯共聚单元可以诱导共聚物产生平衡熔点以上的强熔体记忆效应. 随着熔融时间延长，PBBT共聚物的降温结晶峰值温度逐渐移向高温，这说明
不同于通常认为的记忆效应随熔融热处理时间增长只能逐渐减弱，PBBT共聚物记忆效应还可在熔融热处理过程中发展增强. 此外，PBBT共聚物的记忆效应强度还表现出强烈的结晶温度依赖性，结晶温度越低，记忆效应越强.
Abstract
The macromolecules exhibit the multiscale aggregation features and consequently show the unique memory effect for subsequent re-crystallization. The origin of memory effect was usually related to the survival of crystallization-associated structures after melting
which has a close correlation with molecular architecture. In this work
a series of 1-butene/4-(3-butenyl)toluene (PBBT) copolymers were prepared by dimethylpyridine amine hafnium/[Ph
3
C
]
[B(C
6
F
5
)
4
]
catalyst system to introduce the steric 4-(3-butenyl)toluene co-units with
π
-
π
interaction into the poly(1-butene). Differential scanning calorimetry was employed to systematically study the influence of melt temperature
melting time and crystallization temperature on memory effect of PBBT copolymers. The results showed that the presence of 4-(3-butenyl)toluene co-units induced the occurrence of melt memory effect
which accelerated re-crystallization kinetics without changing the formed crystal modificati
on of tetragonal phase. The triggered memory effect exhibits the maximum strength within the intermediate melt temperatures. Interestingly
as the melting duration increased
the exothermic peak value of cooling crystallization in PBBT copolymers moved to high temperature
demonstrating the melting-enhanced strength of memory effect. This development behavior of memory effect in PBBT is significantly different from the customary decaying evolution reported previously. Moreover
it was found that melt memory effect of PBBT copolymers is also strongly dependent on the crystallization temperature and its strength can be enhanced by lowering crystallization temperature.
2
关键词
1-丁烯共聚物结晶动力学熔体记忆效应
Keywords
1-Butene copolymerCrystallization kineticsMelt memory effect
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