共查询到17条相似文献,搜索用时 234 毫秒
1.
2.
为解决加热卷烟中聚乳酸薄膜降温功能材料加工性能差且容易在烟气加热下塌陷粘连, 阻塞气流通道的问题, 采用造纸法制备了植物纤维/聚乳酸(PLA)复合材料, 并将其应用于加热卷烟的降温段, 制得了抗塌陷的降温滤棒, 研究了纤维配比、压光工艺对复合材料降温性能的影响, 以及复合材料对烟气主要成分的吸收性能。结果表明:①植物纤维/PLA纤维配比约为5∶5(质量比, 下同)的复合材料在20~100 ℃范围具有较优的吸热性能。②随着植物纤维配比的增加, 复合材料的降温效果先增强后减弱, 在植物纤维/PLA纤维配比为4∶6时达到最佳, 此时平均温度降温效果和最高温度降温效果分别为25.3 ℃和29.3 ℃, 优于目前常用的降温材料。③压光降低了材料的孔隙率和比表面积, 不利于烟气和降温材料间的传热, 其中压光温度对复合材料降温性能影响较小, 而高压光压力(>10 N/mm)将明显降低复合材料降温性能。④植物纤维/PLA复合材料具有更好的降温效果, 因此冷凝作用使得降温材料对烟气主要成分(总粒相物、丙二醇、丙三醇、烟碱和水分)的吸收性略高于聚乳酸薄膜降温材料。 相似文献
3.
4.
5.
6.
7.
8.
9.
10.
11.
12.
13.
Characterization of an antioxidant polylactic acid (PLA) film prepared with α-tocopherol,BHT and polyethylene glycol using film cast extruder 总被引:3,自引:0,他引:3
Polylactic acid (PLA) films were prepared with α-tocopherol, buthylated hydroxytoluene (BHT), and polyethylene glycol 400 (PEG 400) using a cast film extruder in an effort to create an antioxidant film. Film properties were characterized by radical scavenging activity and thermal, physical, and gas barrier properties. Final resin compounding and pelletization was achieved by a twin screw extruder and a pelletizator to permit the homogenization of all resin components prior to film casting. Three different PLA films were fabricated for this study: pure PLA film, PLA film with BHT and PEG 400 (BP-PLA film), PLA film with α-tocopherol, BHT, and PEG 400 (ABP-PLA film). The addition of PEG 400 into the pure PLA film decreased the glass transition temperature (Tg) of the film. The BP-PLA and ABP-PLA film had around 51 °C of Tg while pure PLA film had 66 °C. Due to the decreased Tg of both the BP-PLA and ABP-PLA film, both films had an increased elongation at break (%E). The addition of plasticizer into the pure PLA film also caused increased water vapor permeability (WVP) and decreased oxygen permeability (OP). The ABP-PLA film had highest DPPH radical scavenging activity, 90%, while pure PLA and BP-PLA film had only 0 and 14%, respectively. 相似文献
14.
为使过滤材料在使用过程中可实现烟气快速降温,以二醋酸纤维为载体基质,正二十烷为相变材料,采用静电纺丝技术制备了正二十烷/醋酸纤维素复合相变过滤材料,并通过掺杂单壁碳纳米管进一步加快其吸热降温速率。探讨了正二十烷质量分数对纺丝液可纺性、过滤材料表观形貌和热性能的影响,以及单壁碳纳米管质量分数对过滤材料表观形貌、热性能及储热速度的影响。结果表明:添加正二十烷使纺丝液可纺性下降,但随其质量分数的增加,纺丝液的可纺性与成纤性能有所改善,纤维平均直径增加,过滤材料熔融热焓增大,当正二十烷与二醋酸纤维素的质量比为3∶10时,过滤材料的相变焓效率最高,达84.1%;随着单壁碳纳米管质量分数的增加,过滤材料瞬时吸热速率提高,添加质量分数为1.0%时,过滤材料瞬时吸热速度由纯二醋酸纤维的0.062 ℃/s增加到0.202 ℃/s。 相似文献
15.
16.
17.
The melt rheology and thermal properties of polylactide (PLA)-based nanocomposite films that were prepared by solvent casting method with L-PLA, polyethylene glycol (PEG), and montmorillonite clay were studied. The neat PLA showed predominantly solid-like behavior (G' > G″) and the complex viscosity (η*) decreased systematically as the temperature increased from 184 to 196 °C. The elastic modulus (G') of PLA/clay blend showed a significant improvement in the magnitude in the melt, while clay concentration was at 6% wt or higher. At similar condition, PEG dramatically reduced dynamic modulii and complex viscosity of PLA/PEG blend as function of concentration. A nanocomposite blend of PLA/PEG/clay (74/20/6) when compared to the neat polymer and PLA/PEG blend exhibited intermediate values of elastic modulus (G') and complex viscosity (η*) with excellent flexibility. Thermal analysis of different clay loading blends indicated that the melting temperature (T(m)) and glass transition temperature (T(g)) remained unaffected irrespective of clay concentration due to immobilization of polymer chain in the clay nanocomposite. PEG incorporation reduced the T(g) and the T(m) of the blends (PLA/PEG and PLA/PEG/clay) significantly, however, crystallinity increased in the similar condition. The transmission electron microscopy (TEM) image of nanocomposite films indicated good compatibility between PLA and PEG, whereas clay was not thoroughly distributed in the PLA matrix and remained as clusters. The percent crystallinity obtained by X-ray was significantly higher than that of differential scanning calorimeter (DSC) data for PLA. 相似文献