本文選題：聚乳酸　切入點(diǎn)：熔體粘彈特性　出處：《高分子通報(bào)》2017年10期

【摘要】：聚乳酸(PLA)是目前合成生物可降解高分子材料中應(yīng)用量最大的品種,可望逐漸部分取代聚烯烴而更廣泛應(yīng)用于各個(gè)領(lǐng)域。但PLA樹(shù)脂結(jié)構(gòu)決定的松弛特性導(dǎo)致其加工過(guò)程特殊的黏彈特性,使其熔體強(qiáng)度低、成型工藝特性不穩(wěn)定并進(jìn)而導(dǎo)致產(chǎn)品尺寸和性能不穩(wěn)定。此外,PLA極低的結(jié)晶速率,使其在擠出和注射成型等較高冷卻速率的實(shí)際加工條件下呈無(wú)定型態(tài),進(jìn)一步影響了其加工和使用性能。這些問(wèn)題已成為PLA更大規(guī)模商品化應(yīng)用的瓶頸。本文從通過(guò)調(diào)控PLA熔體加工過(guò)程的黏彈特性而提高其可加工性出發(fā),綜述近年來(lái)本課題組在PLA成型加工過(guò)程中熔體粘彈特性和結(jié)晶行為(結(jié)晶速率和結(jié)晶結(jié)構(gòu))調(diào)控方面的研究進(jìn)展。
[Abstract]:Polylactic acid (PLA) is one of the most widely used synthetic biodegradable polymer materials. It is expected that polyolefin will be gradually replaced by polyolefin to be more widely used in various fields. However, the relaxation characteristics of PLA resin due to its structure result in its special viscoelastic properties during processing, resulting in its low melt strength. In addition, the extremely low crystallization rate of PLA makes it amorphous under the conditions of higher cooling rate such as extrusion and injection molding. These problems have become the bottleneck of the larger commercial application of PLA. In this paper, by regulating the viscoelastic properties of PLA melt processing process, the machinability of PLA melt processing process is improved. The recent progress in the study of viscoelastic properties and crystallization behavior (crystallization rate and crystal structure) of melt during PLA molding was reviewed.
【作者單位】： 四川大學(xué)高分子科學(xué)與工程學(xué)院高分子材料工程國(guó)家重點(diǎn)實(shí)驗(yàn)室;
【基金】：國(guó)家自然科學(xué)基金(21374065,51422305,51503132)
【分類號(hào)】：O633.14
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本文編號(hào)：1681808