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Modification of Poly (Propylene Carbonate) by Blending Lignin
  
DOI：10.11980/j.issn.0254-508X.2011.11.006
Key Words:lignin  poly (propylene carbonate)  degradation  modification  melt blending
Fund Project:基金项目：海南大学青年基金（qnjj1167）项目；海南省重点科技项目（080302）；海南省重点科技项目（090502）。
Author NameAffiliation
潘莉莎1 1.海南优势资源化工材料应用技术教育部重点实验室,海南大学材料与化工学院,海南海口，570228 
熊亚林1 1.海南优势资源化工材料应用技术教育部重点实验室,海南大学材料与化工学院,海南海口，570228 
庞素娟1 1.海南优势资源化工材料应用技术教育部重点实验室,海南大学材料与化工学院,海南海口，570228 
代火星1 1.海南优势资源化工材料应用技术教育部重点实验室,海南大学材料与化工学院,海南海口，570228 
徐　鼐1 1.海南优势资源化工材料应用技术教育部重点实验室,海南大学材料与化工学院,海南海口，570228 
林　强2 2.海南师范大学化学与化工学院,海南海口,571158 
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Abstract:Biodegradable blends of poly (propylene carbonate) (PPC) were prepared by melt blending with lignin, the effect of type of lignin and mixing ratio of lignin on the miscibility, glass transition temperature(Tg), weight loss temperature, mechanical properties and degradation of PPC/Alkali Lignin(AL) as well as the mechanism of PCC modification with lignin were investigated. The results showed that the Tg of PPC/AL blend is 30.9℃ that increases by 8.9℃ compared with PPC and T-5%, T-50% and Tmax of PCC/AL are essentially unchanged; the tensile strength increases from 4.30 MPa of PPC to 13.44 MPa of PPC/AL blends and the elongation at break decreases from 830% of PPC to 115% of PPC/AL when AL percentage is 40%, its degradation rate in the 12th day can reach 44%; the Tg, T-5%, T-50% and Tmax of PPC/Calcium Lignosulfonate (CLS) blend are respectively up to 32.1, 196.5, 293.8 and 292.5℃, which increase by 10.1, 3.0, 56.7 and 60.5℃ correspondingly. When the CLS percentage is 20%, the tensile strength reaches to 10.06 MPa that is increased by 134% compare to PCC and the elongation at break is 397% that is less than PPC by 52%, and the degradation rate in the 12th day is up to 38%. Esterification and hydrogen bond are the mainly reaction between lignin and PPC.
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