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Direct Resinification of Two (1→3)-β-D-Glucans, Curdlan and Paramylon, via Hot-Press Compression Molding
Journal of Macromolecular Science Part B-Physics ( IF 1.4 ) Pub Date : 2020-05-19 , DOI: 10.1080/00222348.2020.1766758
Yutaka Kawahara 1 , Takuma Ohtani 1 , Makoto Nakamura 2
Affiliation  

Hot-press compression molding was attempted to resinify two renewable source-derived linear (1→3)-β-D-glucan polymers, i.e., paramylon or curdlan via the generation of reactive aldehyde groups that tend to crosslink with hydroxyl groups of the glucans. As for the paramylon, the optimal molding temperature was found to be around 220 °C, keeping the pressure at 20 MPa for 3 min, due to its highly crystalline structure. On the other hand, the curdlan resin was producible in the temperature range of 180–240 °C at the same pressure and pressing time. Dynamic mechanical analysis revealed a large temperature dependence of the loss modulus, E’’, for the paramylon-based polymer resin whereas the semi-crystalline curdlan resin was stable in terms of both the storage and loss moduli, E’ and E’’, up to 160 °C. The vaporization of the water formed during the molding, due to the thermal decomposition, and the adsorption of moisture due to the hydrophilic property of the paramylon affected the thermal stability. The curdlan resin exhibited flexural strength and modulus extremely superior to those of regenerated and esterified curdlan films, and even a little superior to those of polyamide-12. The strain at break was comparable to the yield strain of an epoxy resin. On the other hand, the paramylon-based polymer resin was producible, but the resinification property and thermal stability of the paramylon resin was inferior to the curdlan resin due to the former’s highly crystalline structure.



中文翻译:

通过热压成型直接将两个(1→3)-β-D-葡聚糖Curdlan和Paramylon树脂化

尝试通过热压模制法,通过生成倾向于与葡聚糖羟基交联的反应性醛基,将两种可再生来源的线性(1→3)-β-D-葡聚糖聚合物(即对甲酰胺或柯德兰树脂)树脂化。至于对甲酰胺,由于其高度结晶的结构,发现最佳成型温度为约220°C,将压力在20 MPa下保持3分钟。另一方面,在相同的压力和加压时间下,可在180-240°C的温度范围内生产柯德兰树脂。动态力学分析表明,对甲基对苯二酚基聚合物树脂的损耗模量E''与温度有很大关系,而半结晶凝胶多糖树脂在储能模量和损耗模量E'和E''方面均稳定。最高160°C。由于热分解而在模制过程中形成的水​​的汽化,以及由于副甲酰胺的亲水性而吸收湿气影响了热稳定性。柯德兰树脂的弯曲强度和模量极大地优于再生和酯化的柯德兰薄膜,甚至略高于聚酰胺-12。断裂应变与环氧树脂的屈服应变相当。另一方面,可以生产基于对mylon的聚合物树脂,但是由于对mymy树脂的高结晶结构,其对mymylon树脂的树脂化性能和热稳定性比对curdlan树脂差。柯德兰树脂的弯曲强度和模量极好于再生和酯化的柯德兰薄膜,甚至略优于聚酰胺12。断裂应变与环氧树脂的屈服应变相当。另一方面,可以生产基于对mylon的聚合物树脂,但是由于对mymy树脂的高结晶结构,其对mymylon树脂的树脂化性能和热稳定性比对curdlan树脂差。柯德兰树脂的弯曲强度和模量极好于再生和酯化的柯德兰薄膜,甚至略优于聚酰胺12。断裂应变与环氧树脂的屈服应变相当。另一方面,可以生产基于对mylon的聚合物树脂,但是由于对mymy树脂的高结晶结构,其对mymylon树脂的树脂化性能和热稳定性比对curdlan树脂差。

更新日期:2020-07-16
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