本研究探討射出成形製程參數對生物可降解材料聚乳酸(Poly lactic acid, PLA)的機械性質影響，以及分子配向性與拉伸強度的相互關係，最後利用氫氧基磷灰石(Hydroxyapatite, HA)作為填充材料，並利用矽烷(Silane)作為耦合劑，觀察不同PLA複材(PLA/HA, PLA/S-HA)之性質的改變，接著利用模內熱退火的方式改變試片的結晶度，並利用維克氏硬度試驗檢測試片硬度的變化。在研究方法上首先利用實驗設計找出對拉伸強度與衝擊強度影響最大的製程參數，並比較最高與最低拉伸強度試片的拉曼峰值強度比，最後利用熱示差掃描卡量計(Differential Scanning Calorimeter, DSC)與熱差分析(Differential Thermal Analyzer, DTA)觀察材料熱性質與熱穩定性的變化。從實驗結果得知拉伸強度受射出速度影響最大，且拉伸強度與拉曼峰值強度比會隨著射出速度的提升而增加，而保壓壓力為影響楊氏模數最重要的因子。各因子對衝擊強度值的影響性皆不顯著，試片的硬度隨著模內熱退火的時間增加而提升。PLA/S-HA的拉伸與衝擊性質皆優於PLA/HA，而PLA/S-HA5韌性較純PLA降低17.2%，PLA/HA5含量的機械性質與熱性質皆優於含量PLA/HA 10。本研究成果可應用於多孔性生物支架之製作。

This study is to investigate the influence of injection molding process for mechanical properties of poly lactic acid (PLA) composite materials, and to observe the relation between molecular orientation and tensile strength. Hydroxyapatite (HA) is used as a filler material, and silane is selected as a couple agent for improving the interface of PLA and HA. Design of experiment is used to find the most important factors for tensile strength and impact strength, and to compare the Raman intensity ratio with tensile strength of specimens. The differential scanning calorimetry (DSC) and differential thermal analyzer (DTA) are used to measure the thermal properties of PLA and PLA composite materials. Results show that the injection velocity is the most significant factor for the tensile strength of both PLA and PLA composite materials. Tensile strength and Raman intensity ratio have been increased with increasing injection velocity. The packing pressure is the most important parameter for Young’s modulus value of both materials. Impact strength of both material have not found significantly for current set-up of experiments. The degree of crystallinity of PLA specimen is increased with longer in-mold annealing time. The mechanical properties and thermal properties of PLA/S-HA are much better than those of PLA/HA. The toughness of PLA composites are lower than that of pure PLA. The mechanical properties and thermal properties of PLA/HA and PLA/S-HA content 5wt% are higher than those of content 10wt%. Result of this study can be applied on bio-medical prosthesis by injection molding of porous PLA composites.

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