@article{gajjar_stallrich_pasquinelli_king_2021, title={Process-Property Relationships for Melt-Spun Poly(lactic acid) Yarn}, volume={6}, ISSN={["2470-1343"]}, url={https://doi.org/10.1021/acsomega.1c01557}, DOI={10.1021/acsomega.1c01557}, abstractNote={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.}, number={24}, journal={ACS OMEGA}, publisher={American Chemical Society (ACS)}, author={Gajjar, Chirag R. and Stallrich, Jon W. and Pasquinelli, Melissa A. and King, Martin W.}, year={2021}, month={Jun}, pages={15920–15928} }
 @article{gajjar_king_gajjar_king_2014, title={Biotextiles: Fiber to Fabric for Medical Applications}, ISBN={["978-3-319-08304-9"]}, ISSN={["2192-1091"]}, DOI={10.1007/978-3-319-08305-6_3}, abstractNote={This chapter describes the importance of fiber-forming biopolymers. Manufacturing processes for biotextiles, and the fabrication of textile structures are also discussed.}, journal={RESORBABLE FIBER-FORMING POLYMERS FOR BIOTEXTILE APPLICATIONS}, author={Gajjar, Chirag R. and King, Martin W. and Gajjar, CR and King, MW}, year={2014}, pages={11–22} }
 @article{gajjar_king_gajjar_king_2014, title={Current Applications of Biotextiles and Future Trends}, ISBN={["978-3-319-08304-9"]}, ISSN={["2192-1091"]}, DOI={10.1007/978-3-319-08305-6_7}, abstractNote={Biotextiles have been used for permanent as well as temporary applications. This chapter reviews the applications of biotextile medical devices along with their structures. Future trends for biotextile devices are also discussed.}, journal={RESORBABLE FIBER-FORMING POLYMERS FOR BIOTEXTILE APPLICATIONS}, author={Gajjar, Chirag R. and King, Martin W. and Gajjar, CR and King, MW}, year={2014}, pages={67–75} }
 @article{gajjar_king_gajjar_king_2014, title={Degradation Process}, ISBN={["978-3-319-08304-9"]}, ISSN={["2192-1091"]}, DOI={10.1007/978-3-319-08305-6_2}, abstractNote={A resorbable biomaterial degrades either by bulk erosion or by surface erosion mechanisms. The critical device dimension is believed to govern the degradation mechanism. Autocatalytic degradation also plays an important role in the degradation of bulk eroding polymers.}, journal={RESORBABLE FIBER-FORMING POLYMERS FOR BIOTEXTILE APPLICATIONS}, author={Gajjar, Chirag R. and King, Martin W. and Gajjar, CR and King, MW}, year={2014}, pages={7–10} }
 @article{gajjar_king_gajjar_king_2014, title={Enzymatically Sensitive Fiber-Forming Bioresorbable Polymers}, ISBN={["978-3-319-08304-9"]}, ISSN={["2192-1091"]}, DOI={10.1007/978-3-319-08305-6_6}, abstractNote={This chapter reviews the fiber-forming resorbable polymers that are sensitive to degradation by enzymes. Mechanical properties, applications, and the mechanism of enzymatic degradation have been discussed.}, journal={RESORBABLE FIBER-FORMING POLYMERS FOR BIOTEXTILE APPLICATIONS}, author={Gajjar, Chirag R. and King, Martin W. and Gajjar, CR and King, MW}, year={2014}, pages={49–65} }
 @article{gajjar_king_gajjar_king_2014, title={Hydrolytically Sensitive Fiber-Forming Bioresorbable Polymers}, ISBN={["978-3-319-08304-9"]}, ISSN={["2192-1091"]}, DOI={10.1007/978-3-319-08305-6_4}, abstractNote={There are many different resorbable polymer systems based on different degradation mechanisms, and having a range of physical and mechanical properties. This chapter covers those polymers that are fiber forming and hydrolytically sensitive. Mechanical properties, resorption profile, and medical applications for these polymers have been discussed.}, journal={RESORBABLE FIBER-FORMING POLYMERS FOR BIOTEXTILE APPLICATIONS}, author={Gajjar, Chirag R. and King, Martin W. and Gajjar, CR and King, MW}, year={2014}, pages={23–41} }
 @article{gajjar_king_gajjar_king_2014, title={Overview of Resorbable Biomaterials}, ISBN={["978-3-319-08304-9"]}, ISSN={["2192-1091"]}, DOI={10.1007/978-3-319-08305-6_1}, abstractNote={Importance of textile based resorbable biomaterials is discussed in this chapter. Requisites for an ideal biomaterial are also given.}, journal={RESORBABLE FIBER-FORMING POLYMERS FOR BIOTEXTILE APPLICATIONS}, author={Gajjar, Chirag R. and King, Martin W. and Gajjar, CR and King, MW}, year={2014}, pages={1–5} }
 @article{gajjar_king_gajjar_king_2014, title={Processing Parameters and the Rate of Resorption}, ISBN={["978-3-319-08304-9"]}, ISSN={["2192-1091"]}, DOI={10.1007/978-3-319-08305-6_5}, abstractNote={There are number of factors that affect the rate of resorption of polymers. These factors can be broadly classified under mechanical properties, fabrication process parameters, and in vivo environmental conditions. Though all these factors are important for successful in vivo performance of these polymers, factors such as spinning parameters, processing conditions, sterilization techniques, and packaging are important from the manufacturer's stand point. Effect of these parameters on the resorption rate has been discussed in this chapter.}, journal={RESORBABLE FIBER-FORMING POLYMERS FOR BIOTEXTILE APPLICATIONS}, author={Gajjar, Chirag R. and King, Martin W. and Gajjar, CR and King, MW}, year={2014}, pages={43–48} }
 @book{gajjar_king_2014, title={Resorbable Fiber-Forming Polymers for Biotextile Applications}, ISBN={["978-3-319-08304-9"]}, ISSN={["2192-1091"]}, DOI={10.1007/978-3-319-08305-6}, abstractNote={This book summarizes the properties and applications of conventional and commercially available fiber-forming, bioresorbable polymers, as well as those currently under study, for use as biotextiles. F}, journal={RESORBABLE FIBER-FORMING POLYMERS FOR BIOTEXTILE APPLICATIONS}, author={Gajjar, CR and King, MW}, year={2014}, pages={1–78} }