熔纺聚乳酸纱线的工艺-性能关系,ACS Omega

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熔纺聚乳酸纱线的工艺-性能关系
ACS Omega ( IF 3.7 ) Pub Date : 2021-06-09 , DOI: 10.1021/acsomega.1c01557
Chirag R Gajjar ₁ , Jon W Stallrich ₂ , Melissa A Pasquinelli _{1,

3} , Martin W King _{1,

4}

Affiliation

聚乳酸 (PLA) 由于其生物相容性、生物降解性和纤维形成能力而成为一种有吸引力的生物材料。然而，聚合物在加工过程中极易发生水解和热降解。熔融加工条件通常涉及高温和剪切，而为了防止过早降解，PLA 需要在最温和的条件下加工，但仍能产生所需的纱线特性。因此，需要确定最佳加工条件以实现挤出 PLA 纱线的所需性能。本研究侧重于熔纺工艺参数对所得 PLA 纱线的机械和物理化学性能的影响，并推导出它们的工艺-性能关系。该研究比较了熔体温度等工艺参数的影响，通过喷丝头的吞吐量、卷取辊的卷取速度、拉伸比和拉伸温度对纱线特性（例如纱线尺寸（线质量密度）、强度、断裂伸长率、结晶度和分子量）的影响。根据工艺参数的组合，所得 PLA 纱线的纱线尺寸范围为 6.2 至 101.6 tex，强度范围为 2.5 至 34.1 gf/tex，断裂伸长率范围为 4 至 480%，结晶度范围为 14.6到 62.2%。加工参数的某些组合会导致更高的加工诱导降解，这从分子量的降低中可以明显看出，降低范围从 7.6% 到 20.5%。

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Process–Property Relationships for Melt-Spun Poly(lactic acid) Yarn

Poly(lactic acid) (PLA) is an attractive biomaterial due to its biocompatibility, biodegradability, and fiber-forming ability. However, the polymer is highly susceptible to both hydrolytic and thermal degradation during processing. Melt processing conditions typically involve high temperature and shear, whereas to prevent premature degradation, PLA needs to be processed under the mildest conditions that still yield the desired yarn properties. Thus, there is a need to determine the optimum processing conditions to achieve the desired properties of extruded PLA yarn. This study focuses on the effect of melt-spinning process parameters on the mechanical and physicochemical properties of the resulting PLA yarn and to derive their process–property relationships. The study compares the effect of process parameters like melt temperature, throughput through the spinneret, take-up speed at the wind-up roller, draw ratio, and drawing temperature on the yarn properties such as the yarn size (linear mass density), tenacity, elongation at break, crystallinity, and molecular weight. Depending on the combination of process parameters, the resulting PLA yarn had a yarn size ranging from 6.2 to 101.6 tex, tenacity ranging from 2.5 to 34.1 gf/tex, elongation at break ranging from 4 to 480%, and degree of crystallinity ranging from 14.6 to 62.2%. Certain combinations of processing parameters resulted in higher process-induced degradation, as evident from the reduction in molecular weight, ranging from 7.6% reduction to 20.5% reduction. Findings from this study increase our understanding on how different process parameters can be utilized to achieve the desired properties of the as-spun and drawn PLA yarn while controlling process-induced premature degradation.

更新日期：2021-06-22

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