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| 1 | Tailoring the Crystallization Behavior and Mechanical Property of Poly(glycolic acid) by Self-nucleation显示文摘Biocompostable poly(glycolic acid)(PGA)crystallizes slowly under fast cooling condition,leading to poor mechanical performance of the final products.In this work,a self-nucleation(SN)route was carried out to promote the crystallization of PGA by regulating only the thermal procedure without any extra nucleating agents.When self-nucleation temperature(Ts)decreased from 250℃ to 227℃,the nuclei density was increased,and the non-isothermal crystallization temperature(Tc)of PGA was increased from 156℃ to 197℃ and the half-life time(t0.5)of isothermal crystallization at 207℃ was decreased by 89%.Consequently,the tensile strength and the elongation at break of the PGA were increased by 12%and 189%,respectively.According to the change of Tc as a function of Ts,a three-stage temperature domain map(Domain I,II and III)was protracted and the viscoelastic behavior of the self-nucleation melt and the homogeneous melt was studied.The results indicated that interaction among PGA chains was remained in Domain IIb,which can act as pre-ordered structure to accelerate the overall crystallization rate.This work utilizes a simple and effective SN method to regulate the crystallization behavior and the mechanical properties of PGA,which may broaden the application range of resulting materials. | Jia-Xuan Li De-Yu Niu Peng-Wu Xu Zhao-Yang Sun Wei-Jun Yang Yang Ji Pi-Ming Ma | 2022 | Chinese Journal of Polymer Science2022，40，4： | 3 |
| 2 | 回收乙酸纤维素改性聚乳酸复合纤维制备及性能显示文摘采用熔融纺丝法制备回收乙酸纤维素(R–CA)改性聚乳酸(PLA)复合纤维(PLA/R–CA),采用差示扫描量热仪、扫描电子显微镜、热失重分析等对复合纤维进行了详细表征,考察了R–CA含量对复合纤维力学性能、热稳定性、熔融和降解行为的影响;以R–CA含量为15%的PLA/R–CA复合纤维为中试原料制备过滤棒,评估了复合丝束过滤棒对不同蒸汽和烟气的吸附性能。结果表明,随R–CA含量增大,复合纤维力学性能呈先增大后降低的趋势,当R–CA含量为10%时,拉伸强度最高为5.7 cN/dtex,断裂伸长率下降;同时,R–CA的加入导致复合纤维的热稳定性逐渐下降,冷结晶受限,降解速率增大。复合纤维丝束滤棒对极性和非极性气体均具有较高的吸附能力,在绿色烟用滤嘴材料方面具有一定的应用前景。 | 杨光远 杨俊鹏 李哲铭 曹祥薇 彭三文 | 2021 | 工程塑料应用2021，49，9： | 1 |
| 3 | 聚乳酸耐热改性的研究进展显示文摘聚乳酸(PLA)因其优异的可降解性、相容性、易加工性,并且机械强度高、无毒、无刺激性,目前被公认为是一类最具工业化应用前景以及研究最为广泛的绿色生物基可降解高分子材料。但是PLA结晶速率慢、结晶度低、耐热性差的缺点严重限制了其在对温度要求较高领域的推广与应用。本文主要从晶型改性、共混改性及交联改性等方面综述了当前国内外PLA耐热性研究的新进展,并对高耐热性PLA的未来发展进行了展望。 | 彭文理 陈志平 蒙春燕 王振宇 冯羽风 宋文春 | 2022 | 绝缘材料2022，55，4： | 1 |
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