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大四寫論文金蟲 (正式寫手)
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| Aromatic polyamides (PAs) are well-known thermally stable polymers with good chemical resistance and thermal stability, low flammability, and very good mechanical properties [13]. However, their limited solubility in most organic solvents and high melting and glass transition temperatures reduce their processability and restrict further applications. Numerous efforts have been made to improve the solubility and processability of aromatic PAs with retention of their high thermal stability. The incorporation of flexible chains into PA backbone, the use of meta-oriented monomers, synthesis of PAs with noncoplanar groups in the polymer chains, introduction of bulky side moieties into the polymer chains resulted in a number of structural modifications of the polymer backbone [14–18]. |
金蟲 (著名寫手)
| 芳族聚酰胺(PA)是眾所周知的熱穩(wěn)定的聚合物,具有良好的化學(xué)耐性、熱穩(wěn)定性、不易燃性以及極好的機(jī)械性能[ 13]。然而,它們?cè)诖蟛糠钟袡C(jī)溶劑中的有限溶解度和高熔點(diǎn)、高玻璃態(tài)轉(zhuǎn)化溫度使它們的加工性能降低并限制了更多的應(yīng)用。 已經(jīng)做出很多努力在保持它們高度熱穩(wěn)定性的情況下去改善芳族PA的可溶性和加工性能。向PA骨架當(dāng)中摻入柔性鏈,使用間位取向單體,合成在聚合物鏈中帶有非共面基團(tuán)的PA,把大側(cè)面一部分引入經(jīng)聚合物骨架作出許多結(jié)構(gòu)修改后生成的聚合物鏈中 [14–18]。 |
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