工 程 塑 料 应 用ENGINEERING PLASTICS APPLICATION第49卷，第1期2021年1月Vol.49，No.1Jan. 202113
doi:10.3969/j.issn.1001-3539.2021.01.003
星型聚氨酯增韧改性聚乳酸3D打印线材
党海春1，雷春兴1，刘占洲1，许召赞2
(1.太原工业学院材料工程系，太原 030008； 2.山西大学资源与环境工程研究所，太原 030006)
摘要：以聚醚三元醇为星型结构单体，采用本体预聚法合成具有可加工性的星型聚氨酯(SPUR)，将其用于聚乳酸(PLA)的增韧改性，制备高韧性PLA／SPUR共混材料的3D打印线材，并采用熔融沉积成型(FDM)技术制备高韧性3D打印制品。结构表征及性能测试结果表明，当聚醚三元醇含量为3%时，合成的SPUR3分子量最高、综合性能最佳，将其与PLA进行共混，可显著提升PLA的断裂伸长率和冲击强度。当SPUR3含量为10%时，断裂伸长率最大，达336%，是PLA断裂伸长率的37.7倍；当SPUR3含量为30%时，共混物的冲击强度达到52.368 kJ／m2，是PLA冲击强度的31.8倍。SPUR3的混入还提高了PLA的结晶温度，降低了其储能模量和玻璃化转变温度，通过控
制SPUR3的含量可以调控共混物的韧性和强度。所制备的打印线材表面均比较光滑，均能通过FDM工艺正常打印成产品。关键词：聚乳酸；星型聚氨酯；增韧；3D打印中图分类号：TQ320.66 文献标识码：A 文章编号：1001-3539(2021)01-0013-07
Toughening Modification of Polylactic Acid Wire for 3D Printing by Star Polyurethane
Dang Haichun1， Lei Chunxing1， Liu Zhanzhou1， Xu Zhaozan2(1. Department of Materials Engineering， Taiyuan Institute of Technology， Taiyuan 030008， China；2. Institute of Resources and Environmental Engineering， Shanxi University， Taiyuan 030006， China)Abstract：Processable star polyurethane (SPUR) was synthesized by bulk prepolymerization with the addition of poly-propylene glycerol (PPG–3) as the core and then it was blended with PLA to improve the toughness of wire. PLA／SPUR wire was used to print products through fused deposition modeling (FDM) technology. SPUR3 with 3% PPG–3 shows the highest molecular weight and the best comprehensive properties and its blending with PLA dramatically improves the elongation at break and impact strength. When the additive amount of SPUR3 is 10%，the elongation at break of PLA／SPUR3 is 336% (37.7 times higher than that of PLA). As the amount of SPUR3 is 30%，impact strength of PLA／SPUR3 is 52.368 kJ／m2 (31.8 times higher than that of PLA).The addition of SPUR3 also increases the crystallization temperature of PLA and decreases its storage modulus and glass transition temperature. The toughness and strength of the blends can be controlled by the content of SPUR3. The prepared printing wires with smooth surface can be printed into products by FDM technology.Keywords：polylactic acid；star polyurethane；toughening modification；3D printing
可持续发光3D打印用聚乳酸基复合材料的制备与性能表征
可持续发光3D打印用聚乳酸基复合材料的制备与性能表征
随着科技的不断发展，3D打印技术在各个领域得到了广泛应用。然而，在一些特定的应用中，仅仅有可视化效果的3D打印制品已经无法满足需求。因此，研究人员开始关注可持续发光3D打印材料的开发。该类材料可以在暗光环境下发光，极大地提升了3D打印制品的功能。
聚乳酸（PLA）是一种生物可降解材料，可由天然资源制备而成。由于其优异的物理化学性质和生物相容性，PLA被广泛用于3D打印。然而，单纯的PLA材料并不能发光，因此需要进行改性来实现3D打印材料的可持续发光性能。
一种常用的方法是将荧光素等功能性发光粉体添加到PLA基体中。这样，当材料受到外界光激发时，发光粉体能够吸收并再辐射出可见光。在添加发光粉体之前，为了增强其与PLA的相容性，常常需要对发光粉体进行表面改性或包覆处理。
除了添加发光粉体，还可以通过引入共混相或共聚物相互作用来改善材料的发光性能。例如，可以将具有特殊功能性的聚合物作为共混相添加到PLA基体中，使得3D打印制品表现出所需的发光效果。此外，还可以采用交联反应或掺杂材料等方法来增加材料的机械强度和稳定性。
为了实现可持续发光3D打印材料的成功制备，还需要进行性能表征。通常使用荧光光谱仪对材料的发光效果进行测试，通过测量发射光强度分布和波长，可以评估材料在不同激发条件下的发光性能。同时，还需要对材料的机械性能、热稳定性和光学性能等进行测试，以确保材料能够在特定应用中正常工作。
在可持续发光3D打印材料的制备与性能表征方面，研究人员还面临一些挑战。首先，发光粉体的稳定性和持久性需要得到提高，以保证材料在长时间使用后仍能发光。其次，需要进一步掌握材料的制备工艺，以提高材料的成型精度和打印速度。
综上所述，可持续发光3D打印材料的制备与性能表征是一个新兴的领域，具有广阔的发展前景。通过改性和改进基体材料，可以制备出具有可持续发光功能的3D打印制品。通过性能表征，可以评估材料的发光效果和机械性能，为其在特定应用中的应用提供支持。然而，仍然需要进一步研究和探索，以解决当前面临的挑战，并推动该领域的进一步发展
学而不思则惘，思而不学则殆
Key to Exercise
Unit 1 Chemical Industries
1. the Industrial Revolution
2. organic chemicals
3. the contact process
4. the Haber process
5. synthetic polymers
6. intermediates
7. artificial fertilizers 8. pesticides (crop protection chemicals)
9. synthetic fibers
10. pharmaceutical
11. research and development
12. petrochemical
13. computers(automatic control equipment)
14. capital intensive
Some Chemicals Used In Our Daily Life
Food artificial fertilizers, pesticide, veterinary products
Health antibiotics, β-blockers
Clothing synthetic fibers (e.g. polyesters, polyamides),
synthetic dyes
Shelter synthetic polymers (e.g. urea-formaldehyde,
polyurethanes),
plastics
Leisure plastics and polymers (e.g. nylon)
Transport additives (e.g. anti-oxidants, viscosity index
improvements),
Introduction
The past few months have been an incredibly rewarding and enlightening
experience for me as an intern in the Operations Department at XYZ
Corporation. This report aims to summarize the key aspects of my
internship, including the objectives, responsibilities, challenges, and
learnings. Through this internship, I have gained invaluable insights
into the operational dynamics of a professional environment, and I am
eager to share my experiences and reflections.
Objective of the Internship
The primary objective of my internship was to gain practical experience
in operations management and to understand the intricacies of managing
day-to-day operations in a corporate setting. I sought to learn about
the processes involved in ensuring smooth operations, improving
efficiency, and contributing to the overall success of the company.
