Enhanced Dielectric and Ferroelectric Properties of Poly(vinylidene fluoride) through Annealing Oriented Crystallites under High Pressure

微晶 铁电性 电介质 材料科学 结晶度 退火(玻璃) 偶极子 无定形固体 化学工程 复合材料 化学物理 结晶学 有机化学 光电子学 化学 工程类 冶金
作者
Ren Jiayi,Qing-Feng Ouyang,Guo-Qi Ma,Yue Li,Jun Lei,Hua‐Dong Huang,Li‐Chuan Jia,Hao Lin,Gan‐Ji Zhong,Zhong‐Ming Li
出处
期刊:Macromolecules [American Chemical Society]
卷期号:55 (6): 2014-2027 被引量:67
标识
DOI:10.1021/acs.macromol.1c02436
摘要

The structural manipulation of the electroactive β phase of poly(vinylidene fluoride) (PVDF) is particularly important in sensor and actuator applications. Herein, an efficient way to enhance dielectric and ferroelectric properties of PVDF films by annealing preoriented PVDF films through thermal treatment combined with the pressure field is proposed. During annealing processing, an appropriate pressure is attributed to the efficient dipole rotation and results in complete phase transformation of the nonpolar α phase (TGTG′) into the polar β phase (TTTT). Moreover, the appropriate pressure and temperature fields synergistically promote a more perfect alignment of the main chain in β-crystallites along the stretching direction. Thus, the pure β phase with ultrahigh orientation (Herman's orientation factor >0.97) is successfully obtained. Moreover, the enhanced mobility of molecular chains with the increase of temperature contributes to the perfection of β-crystallites with high crystallinity. The relaxation of oriented chains in the amorphous region at high temperature during the annealing process is obviously inhibited by high pressure, leading to increased density of dipoles capable of efficient rotation under an electric field. The unique structure obtained imparts a distinctly enhanced dielectric and ferroelectric properties to the PVDF films. The highest dielectric constant at room temperature is observed in preoriented films annealed at 160 °C due to the optimal chain orientation. Moreover, the film with more perfect and tightly packed β-crystallites annealed at 180 °C shows clearly ferroelectric switching and the maximum remnant polarization (5.8 μC/cm2). The outcomes of this work indicate that a rational combination of pressure and temperature fields could effectively achieve optimal dielectric and ferroelectric properties of PVDF oriented films.
最长约 10秒,即可获得该文献文件

科研通智能强力驱动
Strongly Powered by AbleSci AI
更新
PDF的下载单位、IP信息已删除 (2025-6-4)

科研通是完全免费的文献互助平台,具备全网最快的应助速度,最高的求助完成率。 对每一个文献求助,科研通都将尽心尽力,给求助人一个满意的交代。
实时播报
还不错的橙子完成签到,获得积分10
1秒前
鲨鱼牙齿关注了科研通微信公众号
2秒前
情怀应助苏叶采纳,获得10
2秒前
3秒前
跳跃太清完成签到 ,获得积分10
3秒前
科目三应助guojin采纳,获得10
4秒前
6秒前
7秒前
pluto应助淡然的铭采纳,获得10
8秒前
8秒前
我是老大应助roser采纳,获得10
9秒前
SciGPT应助有魅力向珊采纳,获得10
9秒前
呱呱乐发布了新的文献求助30
10秒前
量子星尘发布了新的文献求助10
10秒前
12秒前
13秒前
自然的梦松关注了科研通微信公众号
14秒前
徐开心完成签到,获得积分10
16秒前
风吹似夏完成签到,获得积分10
16秒前
moon发布了新的文献求助10
16秒前
17秒前
机灵的飞兰完成签到,获得积分10
17秒前
少华完成签到,获得积分10
17秒前
18秒前
腼腆的斩完成签到,获得积分10
18秒前
19秒前
19秒前
顾矜应助郁金香采纳,获得10
20秒前
无敌kkk发布了新的文献求助10
20秒前
20秒前
万能图书馆应助啦啦咔嘞采纳,获得10
20秒前
大秋哥哈拉少完成签到,获得积分10
22秒前
22秒前
jam发布了新的文献求助10
23秒前
23秒前
24秒前
25秒前
SciGPT应助郁香薇采纳,获得10
27秒前
Billy发布了新的文献求助30
27秒前
27秒前
高分求助中
A new approach to the extrapolation of accelerated life test data 1000
Cognitive Neuroscience: The Biology of the Mind 1000
Technical Brochure TB 814: LPIT applications in HV gas insulated switchgear 1000
ACSM’s Guidelines for Exercise Testing and Prescription, 12th edition 500
Picture Books with Same-sex Parented Families: Unintentional Censorship 500
Nucleophilic substitution in azasydnone-modified dinitroanisoles 500
不知道标题是什么 500
热门求助领域 (近24小时)
化学 材料科学 医学 生物 工程类 有机化学 生物化学 物理 内科学 纳米技术 计算机科学 化学工程 复合材料 遗传学 基因 物理化学 催化作用 冶金 细胞生物学 免疫学
热门帖子
关注 科研通微信公众号,转发送积分 3969557
求助须知:如何正确求助?哪些是违规求助? 3514377
关于积分的说明 11173836
捐赠科研通 3249692
什么是DOI,文献DOI怎么找? 1794979
邀请新用户注册赠送积分活动 875537
科研通“疑难数据库(出版商)”最低求助积分说明 804836