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| 1 | Structures and Properties of Polyimide with Different Pre-imidization Degrees显示文摘A series of polyimide(PI)films derived from pyromellitic dianhydride(PMDA)and 4,4'-oxydianiline(ODA)were prepared with the employment of chemical pre-imidization,and the pre-imidization degree(pre-ID)was found influential on structures and properties of the films obtained.Specifically,a certain degree of chemical imidization could promote the in-plane orientation of molecular chains inside the film,which then enhanced the mechanical strength and reduced the coefficient of thermal expansion(CTE)of the films.Further,such pre-imidization process could expand the internal space gap inside the films,thereby lowering their dielectric constant and glass transition temperature.Our study provides a new approach for preparing high-performance PI films through chemical imidization. | Fu-Yao Hao Jian-Hua Wang Sheng-Li Qi Guo-Feng Tian De-Zhen Wu | 2020 | Chinese Journal of Polymer Science2020，38，8： | 2 |
| 2 | 聚酰胺吸水率及其对弹性模量的影响研究显示文摘针对两种厚度(0.5 mm和4.1 mm)的聚酰胺样品对水的吸附和解吸过程,以及吸水率对弹性模量的影响进行研究;在此基础上,采用Fick模型和Langmuir模型分析了吸附和解吸曲线,讨论了聚酰胺样品的吸水行为。结果表明,不同温度条件下样品吸水达到饱和点之前,吸水率(wt)与t^1/2基本呈线性关系;当样品吸水饱和后,在较长的浸泡时间内,样品的wt略有降低。吸附和解吸过程中,样品的弹性模量E随t^1/2的变化不同;wt曲线取决于样品的厚度,研究中使用的聚酰胺样品wt曲线变化规律符合Langmuir曲线变化规律。 | 李琦 钱江萍 董颖 | 2020 | 塑料科技2020，48，4： | 0 |
| 3 | Improved Properties of Aromatic Polyamide Tape-casting Films显示文摘A convenient tape-casting method was applied to prepare high performance aromatic polyamide(PA)films based on Technora®.During the polycondensation,CaO was introduced to improve the solubility of the PA resin,and the generated halides were totally removed from the film via a simple water bath,without leaving any defects in PA films.The factors of processing temperature and immersion time had been systematically investigated,and the experimental results demonstrated that both of them had impressive impacts on aggregation state and comprehensive properties of the PA film.It was suggested that immersion in water for more than 1 min and baking below 300℃ for 10 min were the optimal conditions for the thermal,tensile,tear,and optical properties to be in the best equilibrium.The resultant PA films integrated outstanding film-forming ability and excellent general performance,especially the tensile property and tear resistance. | Fu-Lin Liu Jjian-Jun He Hai-Xia Yang Shi-Yong Yang | 2020 | Chinese Journal of Polymer Science2020，38，12： | 0 |
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