Purpose

This paper aims to establish an appropriate annealing method, which is necessary for shape stability and to evaluate their potential degradation performance of 1-, 3- and 5-layer material extruded polylactic-acid specimens by enhancing their thermal and mechanical properties.

Design/methodology/approach

The distortion of each layered printed specimen subjected to degradation was calculated in x- and y-direction. Each layered specimen was subjected to annealing at 70°C, 80°C and 90°C for 2 h and at 80°C for 1, 4, 8 and 16 h. Thermal, molecular weight and mechanical properties were calculated using, differential scanning calorimetry, gel permeation chromatography and tensile testing machine, respectively.

Findings

In the x-direction, distortion was 16.08 mm for one-layer non-annealed printed specimens and decreased by 73% and 83% for 3- and 5-layer, respectively, while each layered non-annealed specimen subjected to degradation at 37°C for one month. Within the outlined study, annealing treatment enhances properties such as the degree of crystallinity (%χ) up to 34%, Young’s modulus (E) by 30% and ultimate tensile strength by 20% compared to the non-annealed specimens.

Practical implications

The future research accomplishments will be concentrated on the design, development and optimisation of degraded biomedical implants using material extrusion thin films including drug delivery system and fixation plates.

Originality/value

The printed thin specimens subjected to degradation were investigated. This research developed a new understanding of the effect of the annealing temperature and time on the mechanical, thermal and molecular weight properties for each layered specimen.

中文翻译：

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改善形状稳定性并增强用于薄植入物的层状材料挤出可生物降解聚乳酸的性能

目的

本文旨在建立一种适当的退火方法，这是形状稳定性所必需的，并通过提高其热性能和机械性能来评估它们对 1、3 和 5 层材料挤出聚乳酸样品的潜在降解性能。

设计/方法/方法

在x和y方向计算每个分层印刷样品遭受降解的变形。每个分层样品在 70°C、80°C 和 90°C 下退火 2 小时，在 80°C 下退火 1、4、8 和 16 小时。分别使用差示扫描量热法、凝胶渗透色谱法和拉伸试验机计算热、分子量和机械性能。

发现

在x方向上，一层未退火印刷试样的变形为 16.08 mm，3 层和 5 层分别减少了 73% 和 83%，而每个分层未退火试样在 37°下降解C 一个月。在概述的研究中，与未退火的样品相比，退火处理可提高诸如结晶度 (%χ) 高达 34%、杨氏模量 (E) 30% 和极限拉伸强度 20% 等特性。

实际影响

未来的研究成果将集中在使用材料挤出薄膜的降解生物医学植入物的设计、开发和优化，包括给药系统和固定板。

原创性/价值

研究了经受降解的印刷薄样品。这项研究对退火温度和时间对每个分层样品的机械、热和分子量特性的影响有了新的认识。